| /* |
| * Copyright (c) 2001-2003 Swedish Institute of Computer Science. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| */ |
| |
| /* This httpd supports for a |
| * rudimentary server-side-include facility which will replace tags of the form |
| * <!--#tag--> in any file whose extension is .shtml, .shtm or .ssi with |
| * strings provided by an include handler whose pointer is provided to the |
| * module via function http_set_ssi_handler(). |
| * Additionally, a simple common |
| * gateway interface (CGI) handling mechanism has been added to allow clients |
| * to hook functions to particular request URIs. |
| * |
| * To enable SSI support, define label LWIP_HTTPD_SSI in lwipopts.h. |
| * To enable CGI support, define label LWIP_HTTPD_CGI in lwipopts.h. |
| * |
| * By default, the server assumes that HTTP headers are already present in |
| * each file stored in the file system. By defining LWIP_HTTPD_DYNAMIC_HEADERS in |
| * lwipopts.h, this behavior can be changed such that the server inserts the |
| * headers automatically based on the extension of the file being served. If |
| * this mode is used, be careful to ensure that the file system image used |
| * does not already contain the header information. |
| * |
| * File system images without headers can be created using the makefsfile |
| * tool with the -h command line option. |
| * |
| * |
| * Notes about valid SSI tags |
| * -------------------------- |
| * |
| * The following assumptions are made about tags used in SSI markers: |
| * |
| * 1. No tag may contain '-' or whitespace characters within the tag name. |
| * 2. Whitespace is allowed between the tag leadin "<!--#" and the start of |
| * the tag name and between the tag name and the leadout string "-->". |
| * 3. The maximum tag name length is LWIP_HTTPD_MAX_TAG_NAME_LEN, currently 8 characters. |
| * |
| * Notes on CGI usage |
| * ------------------ |
| * |
| * The simple CGI support offered here works with GET method requests only |
| * and can handle up to 16 parameters encoded into the URI. The handler |
| * function may not write directly to the HTTP output but must return a |
| * filename that the HTTP server will send to the browser as a response to |
| * the incoming CGI request. |
| * |
| * @todo: |
| * - don't use mem_malloc() (for SSI/dynamic headers) |
| * - split too long functions into multiple smaller functions? |
| * - support more file types? |
| */ |
| #include "lwip/debug.h" |
| #include "lwip/stats.h" |
| #include "httpd.h" |
| #include "httpd_structs.h" |
| #include "lwip/tcp.h" |
| #include "fs.h" |
| |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #if LWIP_TCP |
| |
| #ifndef HTTPD_DEBUG |
| #define HTTPD_DEBUG LWIP_DBG_OFF |
| #endif |
| |
| /** Set this to 1 and add the next line to lwippools.h to use a memp pool |
| * for allocating struct http_state instead of the heap: |
| * |
| * LWIP_MEMPOOL(HTTPD_STATE, 20, 100, "HTTPD_STATE") |
| */ |
| #ifndef HTTPD_USE_MEM_POOL |
| #define HTTPD_USE_MEM_POOL 0 |
| #endif |
| |
| /** The server port for HTTPD to use */ |
| #ifndef HTTPD_SERVER_PORT |
| #define HTTPD_SERVER_PORT 80 |
| #endif |
| |
| /** Maximum retries before the connection is aborted/closed. |
| * - number of times pcb->poll is called -> default is 4*500ms = 2s; |
| * - reset when pcb->sent is called |
| */ |
| #ifndef HTTPD_MAX_RETRIES |
| #define HTTPD_MAX_RETRIES 4 |
| #endif |
| |
| /** The poll delay is X*500ms */ |
| #ifndef HTTPD_POLL_INTERVAL |
| #define HTTPD_POLL_INTERVAL 4 |
| #endif |
| |
| /** Priority for tcp pcbs created by HTTPD (very low by default). |
| * Lower priorities get killed first when running out of memroy. |
| */ |
| #ifndef HTTPD_TCP_PRIO |
| #define HTTPD_TCP_PRIO TCP_PRIO_MIN |
| #endif |
| |
| /** Set this to 1 to enabled timing each file sent */ |
| #ifndef LWIP_HTTPD_TIMING |
| #define LWIP_HTTPD_TIMING 0 |
| #endif |
| #ifndef HTTPD_DEBUG_TIMING |
| #define HTTPD_DEBUG_TIMING LWIP_DBG_OFF |
| #endif |
| |
| /** Set this to 1 on platforms where strnstr is not available */ |
| #ifndef LWIP_HTTPD_STRNSTR_PRIVATE |
| #define LWIP_HTTPD_STRNSTR_PRIVATE 1 |
| #endif |
| |
| /** Set this to one to show error pages when parsing a request fails instead |
| of simply closing the connection. */ |
| #ifndef LWIP_HTTPD_SUPPORT_EXTSTATUS |
| #define LWIP_HTTPD_SUPPORT_EXTSTATUS 0 |
| #endif |
| |
| /** Set this to 0 to drop support for HTTP/0.9 clients (to save some bytes) */ |
| #ifndef LWIP_HTTPD_SUPPORT_V09 |
| #define LWIP_HTTPD_SUPPORT_V09 1 |
| #endif |
| |
| /** Set this to 1 to support HTTP request coming in in multiple packets/pbufs */ |
| #ifndef LWIP_HTTPD_SUPPORT_REQUESTLIST |
| #define LWIP_HTTPD_SUPPORT_REQUESTLIST 0 |
| #endif |
| |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| /** Number of rx pbufs to enqueue to parse an incoming request (up to the first |
| newline) */ |
| #ifndef LWIP_HTTPD_REQ_QUEUELEN |
| #define LWIP_HTTPD_REQ_QUEUELEN 10 |
| #endif |
| |
| /** Number of (TCP payload-) bytes (in pbufs) to enqueue to parse and incoming |
| request (up to the first double-newline) */ |
| #ifndef LWIP_HTTPD_REQ_BUFSIZE |
| #define LWIP_HTTPD_REQ_BUFSIZE LWIP_HTTPD_MAX_REQ_LENGTH |
| #endif |
| |
| /** Defines the maximum length of a HTTP request line (up to the first CRLF, |
| copied from pbuf into this a global buffer when pbuf- or packet-queues |
| are received - otherwise the input pbuf is used directly) */ |
| #ifndef LWIP_HTTPD_MAX_REQ_LENGTH |
| #define LWIP_HTTPD_MAX_REQ_LENGTH 1023 |
| #endif |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| |
| /** Maximum length of the filename to send as response to a POST request, |
| * filled in by the application when a POST is finished. |
| */ |
| #ifndef LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN |
| #define LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN 63 |
| #endif |
| |
| /** Set this to 0 to not send the SSI tag (default is on, so the tag will |
| * be sent in the HTML page */ |
| #ifndef LWIP_HTTPD_SSI_INCLUDE_TAG |
| #define LWIP_HTTPD_SSI_INCLUDE_TAG 1 |
| #endif |
| |
| /** Set this to 1 to call tcp_abort when tcp_close fails with memory error. |
| * This can be used to prevent consuming all memory in situations where the |
| * HTTP server has low priority compared to other communication. */ |
| #ifndef LWIP_HTTPD_ABORT_ON_CLOSE_MEM_ERROR |
| #define LWIP_HTTPD_ABORT_ON_CLOSE_MEM_ERROR 0 |
| #endif |
| |
| #ifndef true |
| #define true ((u8_t)1) |
| #endif |
| |
| #ifndef false |
| #define false ((u8_t)0) |
| #endif |
| |
| /** Minimum length for a valid HTTP/0.9 request: "GET /\r\n" -> 7 bytes */ |
| #define MIN_REQ_LEN 7 |
| |
| #define CRLF "\r\n" |
| |
| /** These defines check whether tcp_write has to copy data or not */ |
| |
| /** This was TI's check whether to let TCP copy data or not |
| #define HTTP_IS_DATA_VOLATILE(hs) ((hs->file < (char *)0x20000000) ? 0 : TCP_WRITE_FLAG_COPY)*/ |
| #ifndef HTTP_IS_DATA_VOLATILE |
| #if LWIP_HTTPD_SSI |
| /* Copy for SSI files, no copy for non-SSI files */ |
| #define HTTP_IS_DATA_VOLATILE(hs) ((hs)->tag_check ? TCP_WRITE_FLAG_COPY : 0) |
| #else /* LWIP_HTTPD_SSI */ |
| /** Default: don't copy if the data is sent from file-system directly */ |
| #define HTTP_IS_DATA_VOLATILE(hs) (((hs->file != NULL) && (hs->handle != NULL) && (hs->file == \ |
| (char*)hs->handle->data + hs->handle->len - hs->left)) \ |
| ? 0 : TCP_WRITE_FLAG_COPY) |
| #endif /* LWIP_HTTPD_SSI */ |
| #endif |
| |
| /** Default: headers are sent from ROM */ |
| #ifndef HTTP_IS_HDR_VOLATILE |
| #define HTTP_IS_HDR_VOLATILE(hs, ptr) 0 |
| #endif |
| |
| #if LWIP_HTTPD_SSI |
| /** Default: Tags are sent from struct http_state and are therefore volatile */ |
| #ifndef HTTP_IS_TAG_VOLATILE |
| #define HTTP_IS_TAG_VOLATILE(ptr) TCP_WRITE_FLAG_COPY |
| #endif |
| #endif /* LWIP_HTTPD_SSI */ |
| |
| typedef struct |
| { |
| const char *name; |
| u8_t shtml; |
| } default_filename; |
| |
| const default_filename g_psDefaultFilenames[] = { |
| {"/index.shtml", true }, |
| {"/index.ssi", true }, |
| {"/index.shtm", true }, |
| {"/index.html", false }, |
| {"/index.htm", false } |
| }; |
| |
| #define NUM_DEFAULT_FILENAMES (sizeof(g_psDefaultFilenames) / \ |
| sizeof(default_filename)) |
| |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| /** HTTP request is copied here from pbufs for simple parsing */ |
| static char httpd_req_buf[LWIP_HTTPD_MAX_REQ_LENGTH+1]; |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| |
| #if LWIP_HTTPD_SUPPORT_POST |
| /** Filename for response file to send when POST is finished */ |
| static char http_post_response_filename[LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN+1]; |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| |
| #if LWIP_HTTPD_DYNAMIC_HEADERS |
| /* The number of individual strings that comprise the headers sent before each |
| * requested file. |
| */ |
| #define NUM_FILE_HDR_STRINGS 3 |
| #endif /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| |
| #if LWIP_HTTPD_SSI |
| |
| #define HTTPD_LAST_TAG_PART 0xFFFF |
| |
| const char * const g_pcSSIExtensions[] = { |
| ".shtml", ".shtm", ".ssi", ".xml" |
| }; |
| |
| #define NUM_SHTML_EXTENSIONS (sizeof(g_pcSSIExtensions) / sizeof(const char *)) |
| |
| enum tag_check_state { |
| TAG_NONE, /* Not processing an SSI tag */ |
| TAG_LEADIN, /* Tag lead in "<!--#" being processed */ |
| TAG_FOUND, /* Tag name being read, looking for lead-out start */ |
| TAG_LEADOUT, /* Tag lead out "-->" being processed */ |
| TAG_SENDING /* Sending tag replacement string */ |
| }; |
| #endif /* LWIP_HTTPD_SSI */ |
| |
| struct http_state { |
| struct fs_file *handle; |
| char *file; /* Pointer to first unsent byte in buf. */ |
| |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| struct pbuf *req; |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| |
| #if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS |
| char *buf; /* File read buffer. */ |
| int buf_len; /* Size of file read buffer, buf. */ |
| #endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */ |
| u32_t left; /* Number of unsent bytes in buf. */ |
| u8_t retries; |
| #if LWIP_HTTPD_SSI |
| const char *parsed; /* Pointer to the first unparsed byte in buf. */ |
| #if !LWIP_HTTPD_SSI_INCLUDE_TAG |
| const char *tag_started;/* Poitner to the first opening '<' of the tag. */ |
| #endif /* !LWIP_HTTPD_SSI_INCLUDE_TAG */ |
| const char *tag_end; /* Pointer to char after the closing '>' of the tag. */ |
| u32_t parse_left; /* Number of unparsed bytes in buf. */ |
| u16_t tag_index; /* Counter used by tag parsing state machine */ |
| u16_t tag_insert_len; /* Length of insert in string tag_insert */ |
| #if LWIP_HTTPD_SSI_MULTIPART |
| u16_t tag_part; /* Counter passed to and changed by tag insertion function to insert multiple times */ |
| #endif /* LWIP_HTTPD_SSI_MULTIPART */ |
| u8_t tag_check; /* true if we are processing a .shtml file else false */ |
| u8_t tag_name_len; /* Length of the tag name in string tag_name */ |
| char tag_name[LWIP_HTTPD_MAX_TAG_NAME_LEN + 1]; /* Last tag name extracted */ |
| char tag_insert[LWIP_HTTPD_MAX_TAG_INSERT_LEN + 1]; /* Insert string for tag_name */ |
| enum tag_check_state tag_state; /* State of the tag processor */ |
| #endif /* LWIP_HTTPD_SSI */ |
| #if LWIP_HTTPD_CGI |
| char *params[LWIP_HTTPD_MAX_CGI_PARAMETERS]; /* Params extracted from the request URI */ |
| char *param_vals[LWIP_HTTPD_MAX_CGI_PARAMETERS]; /* Values for each extracted param */ |
| #endif /* LWIP_HTTPD_CGI */ |
| #if LWIP_HTTPD_DYNAMIC_HEADERS |
| const char *hdrs[NUM_FILE_HDR_STRINGS]; /* HTTP headers to be sent. */ |
| u16_t hdr_pos; /* The position of the first unsent header byte in the |
| current string */ |
| u16_t hdr_index; /* The index of the hdr string currently being sent. */ |
| #endif /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| #if LWIP_HTTPD_TIMING |
| u32_t time_started; |
| #endif /* LWIP_HTTPD_TIMING */ |
| #if LWIP_HTTPD_SUPPORT_POST |
| u32_t post_content_len_left; |
| #if LWIP_HTTPD_POST_MANUAL_WND |
| u32_t unrecved_bytes; |
| struct tcp_pcb *pcb; |
| u8_t no_auto_wnd; |
| #endif /* LWIP_HTTPD_POST_MANUAL_WND */ |
| #endif /* LWIP_HTTPD_SUPPORT_POST*/ |
| }; |
| |
| static err_t http_find_file(struct http_state *hs, const char *uri, int is_09); |
| static err_t http_init_file(struct http_state *hs, struct fs_file *file, int is_09, const char *uri); |
| static err_t http_poll(void *arg, struct tcp_pcb *pcb); |
| |
| #if LWIP_HTTPD_SSI |
| /* SSI insert handler function pointer. */ |
| tSSIHandler g_pfnSSIHandler = NULL; |
| int g_iNumTags = 0; |
| const char **g_ppcTags = NULL; |
| |
| #define LEN_TAG_LEAD_IN 5 |
| const char * const g_pcTagLeadIn = "<!--#"; |
| |
| #define LEN_TAG_LEAD_OUT 3 |
| const char * const g_pcTagLeadOut = "-->"; |
| #endif /* LWIP_HTTPD_SSI */ |
| |
| #if LWIP_HTTPD_CGI |
| /* CGI handler information */ |
| const tCGI *g_pCGIs; |
| int g_iNumCGIs; |
| #endif /* LWIP_HTTPD_CGI */ |
| |
| #if LWIP_HTTPD_STRNSTR_PRIVATE |
| /** Like strstr but does not need 'buffer' to be NULL-terminated */ |
| static char* |
| strnstr(const char* buffer, const char* token, size_t n) |
| { |
| const char* p; |
| int tokenlen = (int)strlen(token); |
| if (tokenlen == 0) { |
| return (char *)buffer; |
| } |
| for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) { |
| if ((*p == *token) && (strncmp(p, token, tokenlen) == 0)) { |
| return (char *)p; |
| } |
| } |
| return NULL; |
| } |
| #endif /* LWIP_HTTPD_STRNSTR_PRIVATE */ |
| |
| /** Allocate a struct http_state. */ |
| static struct http_state* |
| http_state_alloc(void) |
| { |
| struct http_state *ret; |
| #if HTTPD_USE_MEM_POOL |
| ret = (struct http_state *)memp_malloc(MEMP_HTTPD_STATE); |
| #else /* HTTPD_USE_MEM_POOL */ |
| ret = (struct http_state *)mem_malloc(sizeof(struct http_state)); |
| #endif /* HTTPD_USE_MEM_POOL */ |
| if (ret != NULL) { |
| /* Initialize the structure. */ |
| memset(ret, 0, sizeof(struct http_state)); |
| #if LWIP_HTTPD_DYNAMIC_HEADERS |
| /* Indicate that the headers are not yet valid */ |
| ret->hdr_index = NUM_FILE_HDR_STRINGS; |
| #endif /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| } |
| return ret; |
| } |
| |
| /** Free a struct http_state. |
| * Also frees the file data if dynamic. |
| */ |
| static void |
| http_state_free(struct http_state *hs) |
| { |
| if (hs != NULL) { |
| if(hs->handle) { |
| #if LWIP_HTTPD_TIMING |
| u32_t ms_needed = sys_now() - hs->time_started; |
| u32_t needed = LWIP_MAX(1, (ms_needed/100)); |
| LWIP_DEBUGF(HTTPD_DEBUG_TIMING, ("httpd: needed %"U32_F" ms to send file of %d bytes -> %"U32_F" bytes/sec\n", |
| ms_needed, hs->handle->len, ((((u32_t)hs->handle->len) * 10) / needed))); |
| #endif /* LWIP_HTTPD_TIMING */ |
| fs_close(hs->handle); |
| hs->handle = NULL; |
| } |
| #if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS |
| if (hs->buf != NULL) { |
| mem_free(hs->buf); |
| hs->buf = NULL; |
| } |
| #endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */ |
| #if HTTPD_USE_MEM_POOL |
| memp_free(MEMP_HTTPD_STATE, hs); |
| #else /* HTTPD_USE_MEM_POOL */ |
| mem_free(hs); |
| #endif /* HTTPD_USE_MEM_POOL */ |
| } |
| } |
| |
| /** Call tcp_write() in a loop trying smaller and smaller length |
| * |
| * @param pcb tcp_pcb to send |
| * @param ptr Data to send |
| * @param length Length of data to send (in/out: on return, contains the |
| * amount of data sent) |
| * @param apiflags directly passed to tcp_write |
| * @return the return value of tcp_write |
| */ |
| static err_t |
| http_write(struct tcp_pcb *pcb, const void* ptr, u16_t *length, u8_t apiflags) |
| { |
| u16_t len; |
| err_t err; |
| LWIP_ASSERT("length != NULL", length != NULL); |
| len = *length; |
| do { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Trying go send %d bytes\n", len)); |
| err = tcp_write(pcb, ptr, len, apiflags); |
| if (err == ERR_MEM) { |
| if ((tcp_sndbuf(pcb) == 0) || |
| (tcp_sndqueuelen(pcb) >= TCP_SND_QUEUELEN)) { |
| /* no need to try smaller sizes */ |
| len = 1; |
| } else { |
| len /= 2; |
| } |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, |
| ("Send failed, trying less (%d bytes)\n", len)); |
| } |
| } while ((err == ERR_MEM) && (len > 1)); |
| |
| if (err == ERR_OK) { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Sent %d bytes\n", len)); |
| } else { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Send failed with err %d (\"%s\")\n", err, lwip_strerr(err))); |
| } |
| |
| *length = len; |
| return err; |
| } |
| |
| /** |
| * The connection shall be actively closed. |
| * Reset the sent- and recv-callbacks. |
| * |
| * @param pcb the tcp pcb to reset callbacks |
| * @param hs connection state to free |
| */ |
| static err_t |
| http_close_conn(struct tcp_pcb *pcb, struct http_state *hs) |
| { |
| err_t err; |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Closing connection %p\n", (void*)pcb)); |
| |
| #if LWIP_HTTPD_SUPPORT_POST |
| if (hs != NULL) { |
| if ((hs->post_content_len_left != 0) |
| #if LWIP_HTTPD_POST_MANUAL_WND |
| || ((hs->no_auto_wnd != 0) && (hs->unrecved_bytes != 0)) |
| #endif /* LWIP_HTTPD_POST_MANUAL_WND */ |
| ) { |
| /* make sure the post code knows that the connection is closed */ |
| http_post_response_filename[0] = 0; |
| httpd_post_finished(hs, http_post_response_filename, LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN); |
| } |
| } |
| #endif /* LWIP_HTTPD_SUPPORT_POST*/ |
| |
| |
| tcp_arg(pcb, NULL); |
| tcp_recv(pcb, NULL); |
| tcp_err(pcb, NULL); |
| tcp_poll(pcb, NULL, 0); |
| tcp_sent(pcb, NULL); |
| if(hs != NULL) { |
| http_state_free(hs); |
| } |
| |
| err = tcp_close(pcb); |
| if (err != ERR_OK) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Error %d closing %p\n", err, (void*)pcb)); |
| /* error closing, try again later in poll */ |
| tcp_poll(pcb, http_poll, HTTPD_POLL_INTERVAL); |
| } |
| return err; |
| } |
| #if LWIP_HTTPD_CGI |
| /** |
| * Extract URI parameters from the parameter-part of an URI in the form |
| * "test.cgi?x=y" @todo: better explanation! |
| * Pointers to the parameters are stored in hs->param_vals. |
| * |
| * @param hs http connection state |
| * @param params pointer to the NULL-terminated parameter string from the URI |
| * @return number of parameters extracted |
| */ |
| static int |
| extract_uri_parameters(struct http_state *hs, char *params) |
| { |
| char *pair; |
| char *equals; |
| int loop; |
| |
| /* If we have no parameters at all, return immediately. */ |
| if(!params || (params[0] == '\0')) { |
| return(0); |
| } |
| |
| /* Get a pointer to our first parameter */ |
| pair = params; |
| |
| /* Parse up to LWIP_HTTPD_MAX_CGI_PARAMETERS from the passed string and ignore the |
| * remainder (if any) */ |
| for(loop = 0; (loop < LWIP_HTTPD_MAX_CGI_PARAMETERS) && pair; loop++) { |
| |
| /* Save the name of the parameter */ |
| hs->params[loop] = pair; |
| |
| /* Remember the start of this name=value pair */ |
| equals = pair; |
| |
| /* Find the start of the next name=value pair and replace the delimiter |
| * with a 0 to terminate the previous pair string. */ |
| pair = strchr(pair, '&'); |
| if(pair) { |
| *pair = '\0'; |
| pair++; |
| } else { |
| /* We didn't find a new parameter so find the end of the URI and |
| * replace the space with a '\0' */ |
| pair = strchr(equals, ' '); |
| if(pair) { |
| *pair = '\0'; |
| } |
| |
| /* Revert to NULL so that we exit the loop as expected. */ |
| pair = NULL; |
| } |
| |
| /* Now find the '=' in the previous pair, replace it with '\0' and save |
| * the parameter value string. */ |
| equals = strchr(equals, '='); |
| if(equals) { |
| *equals = '\0'; |
| hs->param_vals[loop] = equals + 1; |
| } else { |
| hs->param_vals[loop] = NULL; |
| } |
| } |
| |
| return loop; |
| } |
| #endif /* LWIP_HTTPD_CGI */ |
| |
| #if LWIP_HTTPD_SSI |
| /** |
| * Insert a tag (found in an shtml in the form of "<!--#tagname-->" into the file. |
| * The tag's name is stored in hs->tag_name (NULL-terminated), the replacement |
| * should be written to hs->tag_insert (up to a length of LWIP_HTTPD_MAX_TAG_INSERT_LEN). |
| * The amount of data written is stored to hs->tag_insert_len. |
| * |
| * @todo: return tag_insert_len - maybe it can be removed from struct http_state? |
| * |
| * @param hs http connection state |
| */ |
| static void |
| get_tag_insert(struct http_state *hs) |
| { |
| int loop; |
| size_t len; |
| #if LWIP_HTTPD_SSI_MULTIPART |
| u16_t current_tag_part = hs->tag_part; |
| hs->tag_part = HTTPD_LAST_TAG_PART; |
| #endif /* LWIP_HTTPD_SSI_MULTIPART */ |
| |
| if(g_pfnSSIHandler && g_ppcTags && g_iNumTags) { |
| |
| /* Find this tag in the list we have been provided. */ |
| for(loop = 0; loop < g_iNumTags; loop++) { |
| if(strcmp(hs->tag_name, g_ppcTags[loop]) == 0) { |
| hs->tag_insert_len = g_pfnSSIHandler(loop, hs->tag_insert, |
| LWIP_HTTPD_MAX_TAG_INSERT_LEN |
| #if LWIP_HTTPD_SSI_MULTIPART |
| , current_tag_part, &hs->tag_part |
| #endif /* LWIP_HTTPD_SSI_MULTIPART */ |
| #if LWIP_HTTPD_FILE_STATE |
| , hs->handle->state |
| #endif /* LWIP_HTTPD_FILE_STATE */ |
| ); |
| return; |
| } |
| } |
| } |
| |
| /* If we drop out, we were asked to serve a page which contains tags that |
| * we don't have a handler for. Merely echo back the tags with an error |
| * marker. */ |
| #define UNKNOWN_TAG1_TEXT "<b>***UNKNOWN TAG " |
| #define UNKNOWN_TAG1_LEN 18 |
| #define UNKNOWN_TAG2_TEXT "***</b>" |
| #define UNKNOWN_TAG2_LEN 7 |
| len = LWIP_MIN(strlen(hs->tag_name), |
| LWIP_HTTPD_MAX_TAG_INSERT_LEN - (UNKNOWN_TAG1_LEN + UNKNOWN_TAG2_LEN)); |
| MEMCPY(hs->tag_insert, UNKNOWN_TAG1_TEXT, UNKNOWN_TAG1_LEN); |
| MEMCPY(&hs->tag_insert[UNKNOWN_TAG1_LEN], hs->tag_name, len); |
| MEMCPY(&hs->tag_insert[UNKNOWN_TAG1_LEN + len], UNKNOWN_TAG2_TEXT, UNKNOWN_TAG2_LEN); |
| hs->tag_insert[UNKNOWN_TAG1_LEN + len + UNKNOWN_TAG2_LEN] = 0; |
| |
| len = strlen(hs->tag_insert); |
| LWIP_ASSERT("len <= 0xffff", len <= 0xffff); |
| hs->tag_insert_len = (u16_t)len; |
| } |
| #endif /* LWIP_HTTPD_SSI */ |
| |
| #if LWIP_HTTPD_DYNAMIC_HEADERS |
| /** |
| * Generate the relevant HTTP headers for the given filename and write |
| * them into the supplied buffer. |
| */ |
| static void |
| get_http_headers(struct http_state *pState, char *pszURI) |
| { |
| unsigned int iLoop; |
| char *pszWork; |
| char *pszExt; |
| char *pszVars; |
| |
| /* Ensure that we initialize the loop counter. */ |
| iLoop = 0; |
| |
| /* In all cases, the second header we send is the server identification |
| so set it here. */ |
| pState->hdrs[1] = g_psHTTPHeaderStrings[HTTP_HDR_SERVER]; |
| |
| /* Is this a normal file or the special case we use to send back the |
| default "404: Page not found" response? */ |
| if (pszURI == NULL) { |
| pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_NOT_FOUND]; |
| pState->hdrs[2] = g_psHTTPHeaderStrings[DEFAULT_404_HTML]; |
| |
| /* Set up to send the first header string. */ |
| pState->hdr_index = 0; |
| pState->hdr_pos = 0; |
| return; |
| } else { |
| /* We are dealing with a particular filename. Look for one other |
| special case. We assume that any filename with "404" in it must be |
| indicative of a 404 server error whereas all other files require |
| the 200 OK header. */ |
| if (strstr(pszURI, "404")) { |
| pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_NOT_FOUND]; |
| } else if (strstr(pszURI, "400")) { |
| pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_BAD_REQUEST]; |
| } else if (strstr(pszURI, "501")) { |
| pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_NOT_IMPL]; |
| } else { |
| pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_OK]; |
| } |
| |
| /* Determine if the URI has any variables and, if so, temporarily remove |
| them. */ |
| pszVars = strchr(pszURI, '?'); |
| if(pszVars) { |
| *pszVars = '\0'; |
| } |
| |
| /* Get a pointer to the file extension. We find this by looking for the |
| last occurrence of "." in the filename passed. */ |
| pszExt = NULL; |
| pszWork = strchr(pszURI, '.'); |
| while(pszWork) { |
| pszExt = pszWork + 1; |
| pszWork = strchr(pszExt, '.'); |
| } |
| |
| /* Now determine the content type and add the relevant header for that. */ |
| for(iLoop = 0; (iLoop < NUM_HTTP_HEADERS) && pszExt; iLoop++) { |
| /* Have we found a matching extension? */ |
| if(!strcmp(g_psHTTPHeaders[iLoop].extension, pszExt)) { |
| pState->hdrs[2] = |
| g_psHTTPHeaderStrings[g_psHTTPHeaders[iLoop].headerIndex]; |
| break; |
| } |
| } |
| |
| /* Reinstate the parameter marker if there was one in the original URI. */ |
| if(pszVars) { |
| *pszVars = '?'; |
| } |
| } |
| |
| /* Does the URL passed have any file extension? If not, we assume it |
| is a special-case URL used for control state notification and we do |
| not send any HTTP headers with the response. */ |
| if(!pszExt) { |
| /* Force the header index to a value indicating that all headers |
| have already been sent. */ |
| pState->hdr_index = NUM_FILE_HDR_STRINGS; |
| } else { |
| /* Did we find a matching extension? */ |
| if(iLoop == NUM_HTTP_HEADERS) { |
| /* No - use the default, plain text file type. */ |
| pState->hdrs[2] = g_psHTTPHeaderStrings[HTTP_HDR_DEFAULT_TYPE]; |
| } |
| |
| /* Set up to send the first header string. */ |
| pState->hdr_index = 0; |
| pState->hdr_pos = 0; |
| } |
| } |
| #endif /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| |
| /** |
| * Try to send more data on this pcb. |
| * |
| * @param pcb the pcb to send data |
| * @param hs connection state |
| */ |
| static u8_t |
| http_send_data(struct tcp_pcb *pcb, struct http_state *hs) |
| { |
| err_t err; |
| u16_t len; |
| u16_t mss; |
| u8_t data_to_send = false; |
| #if LWIP_HTTPD_DYNAMIC_HEADERS |
| u16_t hdrlen, sendlen; |
| #endif /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("http_send_data: pcb=%p hs=%p left=%d\n", (void*)pcb, |
| (void*)hs, hs != NULL ? hs->left : 0)); |
| |
| #if LWIP_HTTPD_SUPPORT_POST && LWIP_HTTPD_POST_MANUAL_WND |
| if (hs->unrecved_bytes != 0) { |
| return 0; |
| } |
| #endif /* LWIP_HTTPD_SUPPORT_POST && LWIP_HTTPD_POST_MANUAL_WND */ |
| |
| #if LWIP_HTTPD_DYNAMIC_HEADERS |
| /* If we were passed a NULL state structure pointer, ignore the call. */ |
| if (hs == NULL) { |
| return 0; |
| } |
| |
| /* Assume no error until we find otherwise */ |
| err = ERR_OK; |
| |
| /* Do we have any more header data to send for this file? */ |
| if(hs->hdr_index < NUM_FILE_HDR_STRINGS) { |
| /* How much data can we send? */ |
| len = tcp_sndbuf(pcb); |
| sendlen = len; |
| |
| while(len && (hs->hdr_index < NUM_FILE_HDR_STRINGS) && sendlen) { |
| const void *ptr; |
| u16_t old_sendlen; |
| /* How much do we have to send from the current header? */ |
| hdrlen = (u16_t)strlen(hs->hdrs[hs->hdr_index]); |
| |
| /* How much of this can we send? */ |
| sendlen = (len < (hdrlen - hs->hdr_pos)) ? len : (hdrlen - hs->hdr_pos); |
| |
| /* Send this amount of data or as much as we can given memory |
| * constraints. */ |
| ptr = (const void *)(hs->hdrs[hs->hdr_index] + hs->hdr_pos); |
| old_sendlen = sendlen; |
| err = http_write(pcb, ptr, &sendlen, HTTP_IS_HDR_VOLATILE(hs, ptr)); |
| if ((err == ERR_OK) && (old_sendlen != sendlen)) { |
| /* Remember that we added some more data to be transmitted. */ |
| data_to_send = true; |
| } else if (err != ERR_OK) { |
| /* special case: http_write does not try to send 1 byte */ |
| sendlen = 0; |
| } |
| |
| /* Fix up the header position for the next time round. */ |
| hs->hdr_pos += sendlen; |
| len -= sendlen; |
| |
| /* Have we finished sending this string? */ |
| if(hs->hdr_pos == hdrlen) { |
| /* Yes - move on to the next one */ |
| hs->hdr_index++; |
| hs->hdr_pos = 0; |
| } |
| } |
| |
| /* If we get here and there are still header bytes to send, we send |
| * the header information we just wrote immediately. If there are no |
| * more headers to send, but we do have file data to send, drop through |
| * to try to send some file data too. */ |
| if((hs->hdr_index < NUM_FILE_HDR_STRINGS) || !hs->file) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("tcp_output\n")); |
| return 1; |
| } |
| } |
| #else /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| /* Assume no error until we find otherwise */ |
| err = ERR_OK; |
| #endif /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| |
| /* Have we run out of file data to send? If so, we need to read the next |
| * block from the file. */ |
| if (hs->left == 0) { |
| #if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS |
| int count; |
| #endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */ |
| |
| /* Do we have a valid file handle? */ |
| if (hs->handle == NULL) { |
| /* No - close the connection. */ |
| http_close_conn(pcb, hs); |
| return 0; |
| } |
| if (fs_bytes_left(hs->handle) <= 0) { |
| /* We reached the end of the file so this request is done. |
| * @todo: don't close here for HTTP/1.1? */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("End of file.\n")); |
| http_close_conn(pcb, hs); |
| return 0; |
| } |
| #if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS |
| /* Do we already have a send buffer allocated? */ |
| if(hs->buf) { |
| /* Yes - get the length of the buffer */ |
| count = hs->buf_len; |
| } else { |
| /* We don't have a send buffer so allocate one up to 2mss bytes long. */ |
| count = 2 * tcp_mss(pcb); |
| do { |
| hs->buf = (char*)mem_malloc((mem_size_t)count); |
| if (hs->buf != NULL) { |
| hs->buf_len = count; |
| break; |
| } |
| count = count / 2; |
| } while (count > 100); |
| |
| /* Did we get a send buffer? If not, return immediately. */ |
| if (hs->buf == NULL) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("No buff\n")); |
| return 0; |
| } |
| } |
| |
| /* Read a block of data from the file. */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Trying to read %d bytes.\n", count)); |
| |
| count = fs_read(hs->handle, hs->buf, count); |
| if(count < 0) { |
| /* We reached the end of the file so this request is done. |
| * @todo: don't close here for HTTP/1.1? */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("End of file.\n")); |
| http_close_conn(pcb, hs); |
| return 1; |
| } |
| |
| /* Set up to send the block of data we just read */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Read %d bytes.\n", count)); |
| hs->left = count; |
| hs->file = hs->buf; |
| #if LWIP_HTTPD_SSI |
| hs->parse_left = count; |
| hs->parsed = hs->buf; |
| #endif /* LWIP_HTTPD_SSI */ |
| #else /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */ |
| LWIP_ASSERT("SSI and DYNAMIC_HEADERS turned off but eof not reached", 0); |
| #endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */ |
| } |
| |
| #if LWIP_HTTPD_SSI |
| if(!hs->tag_check) { |
| #endif /* LWIP_HTTPD_SSI */ |
| /* We are not processing an SHTML file so no tag checking is necessary. |
| * Just send the data as we received it from the file. */ |
| |
| /* We cannot send more data than space available in the send |
| buffer. */ |
| if (tcp_sndbuf(pcb) < hs->left) { |
| len = tcp_sndbuf(pcb); |
| } else { |
| len = (u16_t)hs->left; |
| LWIP_ASSERT("hs->left did not fit into u16_t!", (len == hs->left)); |
| } |
| mss = tcp_mss(pcb); |
| if(len > (2 * mss)) { |
| len = 2 * mss; |
| } |
| |
| err = http_write(pcb, hs->file, &len, HTTP_IS_DATA_VOLATILE(hs)); |
| if (err == ERR_OK) { |
| data_to_send = true; |
| hs->file += len; |
| hs->left -= len; |
| } |
| #if LWIP_HTTPD_SSI |
| } else { |
| /* We are processing an SHTML file so need to scan for tags and replace |
| * them with insert strings. We need to be careful here since a tag may |
| * straddle the boundary of two blocks read from the file and we may also |
| * have to split the insert string between two tcp_write operations. */ |
| |
| /* How much data could we send? */ |
| len = tcp_sndbuf(pcb); |
| |
| /* Do we have remaining data to send before parsing more? */ |
| if(hs->parsed > hs->file) { |
| /* We cannot send more data than space available in the send |
| buffer. */ |
| if (tcp_sndbuf(pcb) < (hs->parsed - hs->file)) { |
| len = tcp_sndbuf(pcb); |
| } else { |
| LWIP_ASSERT("Data size does not fit into u16_t!", |
| (hs->parsed - hs->file) <= 0xffff); |
| len = (u16_t)(hs->parsed - hs->file); |
| } |
| mss = tcp_mss(pcb); |
| if(len > (2 * mss)) { |
| len = 2 * mss; |
| } |
| |
| err = http_write(pcb, hs->file, &len, HTTP_IS_DATA_VOLATILE(hs)); |
| if (err == ERR_OK) { |
| data_to_send = true; |
| hs->file += len; |
| hs->left -= len; |
| } |
| |
| /* If the send buffer is full, return now. */ |
| if(tcp_sndbuf(pcb) == 0) { |
| return data_to_send; |
| } |
| } |
| |
| LWIP_DEBUGF(HTTPD_DEBUG, ("State %d, %d left\n", hs->tag_state, hs->parse_left)); |
| |
| /* We have sent all the data that was already parsed so continue parsing |
| * the buffer contents looking for SSI tags. */ |
| while((hs->parse_left) && (err == ERR_OK)) { |
| /* @todo: somewhere in this loop, 'len' should grow again... */ |
| if (len == 0) { |
| return data_to_send; |
| } |
| switch(hs->tag_state) { |
| case TAG_NONE: |
| /* We are not currently processing an SSI tag so scan for the |
| * start of the lead-in marker. */ |
| if(*hs->parsed == g_pcTagLeadIn[0]) { |
| /* We found what could be the lead-in for a new tag so change |
| * state appropriately. */ |
| hs->tag_state = TAG_LEADIN; |
| hs->tag_index = 1; |
| #if !LWIP_HTTPD_SSI_INCLUDE_TAG |
| hs->tag_started = hs->parsed; |
| #endif /* !LWIP_HTTPD_SSI_INCLUDE_TAG */ |
| } |
| |
| /* Move on to the next character in the buffer */ |
| hs->parse_left--; |
| hs->parsed++; |
| break; |
| |
| case TAG_LEADIN: |
| /* We are processing the lead-in marker, looking for the start of |
| * the tag name. */ |
| |
| /* Have we reached the end of the leadin? */ |
| if(hs->tag_index == LEN_TAG_LEAD_IN) { |
| hs->tag_index = 0; |
| hs->tag_state = TAG_FOUND; |
| } else { |
| /* Have we found the next character we expect for the tag leadin? */ |
| if(*hs->parsed == g_pcTagLeadIn[hs->tag_index]) { |
| /* Yes - move to the next one unless we have found the complete |
| * leadin, in which case we start looking for the tag itself */ |
| hs->tag_index++; |
| } else { |
| /* We found an unexpected character so this is not a tag. Move |
| * back to idle state. */ |
| hs->tag_state = TAG_NONE; |
| } |
| |
| /* Move on to the next character in the buffer */ |
| hs->parse_left--; |
| hs->parsed++; |
| } |
| break; |
| |
| case TAG_FOUND: |
| /* We are reading the tag name, looking for the start of the |
| * lead-out marker and removing any whitespace found. */ |
| |
| /* Remove leading whitespace between the tag leading and the first |
| * tag name character. */ |
| if((hs->tag_index == 0) && ((*hs->parsed == ' ') || |
| (*hs->parsed == '\t') || (*hs->parsed == '\n') || |
| (*hs->parsed == '\r'))) { |
| /* Move on to the next character in the buffer */ |
| hs->parse_left--; |
| hs->parsed++; |
| break; |
| } |
| |
| /* Have we found the end of the tag name? This is signalled by |
| * us finding the first leadout character or whitespace */ |
| if((*hs->parsed == g_pcTagLeadOut[0]) || |
| (*hs->parsed == ' ') || (*hs->parsed == '\t') || |
| (*hs->parsed == '\n') || (*hs->parsed == '\r')) { |
| |
| if(hs->tag_index == 0) { |
| /* We read a zero length tag so ignore it. */ |
| hs->tag_state = TAG_NONE; |
| } else { |
| /* We read a non-empty tag so go ahead and look for the |
| * leadout string. */ |
| hs->tag_state = TAG_LEADOUT; |
| LWIP_ASSERT("hs->tag_index <= 0xff", hs->tag_index <= 0xff); |
| hs->tag_name_len = (u8_t)hs->tag_index; |
| hs->tag_name[hs->tag_index] = '\0'; |
| if(*hs->parsed == g_pcTagLeadOut[0]) { |
| hs->tag_index = 1; |
| } else { |
| hs->tag_index = 0; |
| } |
| } |
| } else { |
| /* This character is part of the tag name so save it */ |
| if(hs->tag_index < LWIP_HTTPD_MAX_TAG_NAME_LEN) { |
| hs->tag_name[hs->tag_index++] = *hs->parsed; |
| } else { |
| /* The tag was too long so ignore it. */ |
| hs->tag_state = TAG_NONE; |
| } |
| } |
| |
| /* Move on to the next character in the buffer */ |
| hs->parse_left--; |
| hs->parsed++; |
| |
| break; |
| |
| /* We are looking for the end of the lead-out marker. */ |
| case TAG_LEADOUT: |
| /* Remove leading whitespace between the tag leading and the first |
| * tag leadout character. */ |
| if((hs->tag_index == 0) && ((*hs->parsed == ' ') || |
| (*hs->parsed == '\t') || (*hs->parsed == '\n') || |
| (*hs->parsed == '\r'))) { |
| /* Move on to the next character in the buffer */ |
| hs->parse_left--; |
| hs->parsed++; |
| break; |
| } |
| |
| /* Have we found the next character we expect for the tag leadout? */ |
| if(*hs->parsed == g_pcTagLeadOut[hs->tag_index]) { |
| /* Yes - move to the next one unless we have found the complete |
| * leadout, in which case we need to call the client to process |
| * the tag. */ |
| |
| /* Move on to the next character in the buffer */ |
| hs->parse_left--; |
| hs->parsed++; |
| |
| if(hs->tag_index == (LEN_TAG_LEAD_OUT - 1)) { |
| /* Call the client to ask for the insert string for the |
| * tag we just found. */ |
| #if LWIP_HTTPD_SSI_MULTIPART |
| hs->tag_part = 0; /* start with tag part 0 */ |
| #endif /* LWIP_HTTPD_SSI_MULTIPART */ |
| get_tag_insert(hs); |
| |
| /* Next time through, we are going to be sending data |
| * immediately, either the end of the block we start |
| * sending here or the insert string. */ |
| hs->tag_index = 0; |
| hs->tag_state = TAG_SENDING; |
| hs->tag_end = hs->parsed; |
| #if !LWIP_HTTPD_SSI_INCLUDE_TAG |
| hs->parsed = hs->tag_started; |
| #endif /* !LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| |
| /* If there is any unsent data in the buffer prior to the |
| * tag, we need to send it now. */ |
| if (hs->tag_end > hs->file) { |
| /* How much of the data can we send? */ |
| #if LWIP_HTTPD_SSI_INCLUDE_TAG |
| if(len > hs->tag_end - hs->file) { |
| len = (u16_t)(hs->tag_end - hs->file); |
| } |
| #else /* LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| if(len > hs->tag_started - hs->file) { |
| /* we would include the tag in sending */ |
| len = (u16_t)(hs->tag_started - hs->file); |
| } |
| #endif /* LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| |
| err = http_write(pcb, hs->file, &len, HTTP_IS_DATA_VOLATILE(hs)); |
| if (err == ERR_OK) { |
| data_to_send = true; |
| #if !LWIP_HTTPD_SSI_INCLUDE_TAG |
| if(hs->tag_started <= hs->file) { |
| /* pretend to have sent the tag, too */ |
| len += hs->tag_end - hs->tag_started; |
| } |
| #endif /* !LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| hs->file += len; |
| hs->left -= len; |
| } |
| } |
| } else { |
| hs->tag_index++; |
| } |
| } else { |
| /* We found an unexpected character so this is not a tag. Move |
| * back to idle state. */ |
| hs->parse_left--; |
| hs->parsed++; |
| hs->tag_state = TAG_NONE; |
| } |
| break; |
| |
| /* |
| * We have found a valid tag and are in the process of sending |
| * data as a result of that discovery. We send either remaining data |
| * from the file prior to the insert point or the insert string itself. |
| */ |
| case TAG_SENDING: |
| /* Do we have any remaining file data to send from the buffer prior |
| * to the tag? */ |
| if(hs->tag_end > hs->file) { |
| /* How much of the data can we send? */ |
| #if LWIP_HTTPD_SSI_INCLUDE_TAG |
| if(len > hs->tag_end - hs->file) { |
| len = (u16_t)(hs->tag_end - hs->file); |
| } |
| #else /* LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| LWIP_ASSERT("hs->started >= hs->file", hs->tag_started >= hs->file); |
| if (len > hs->tag_started - hs->file) { |
| /* we would include the tag in sending */ |
| len = (u16_t)(hs->tag_started - hs->file); |
| } |
| #endif /* LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| if (len != 0) { |
| err = http_write(pcb, hs->file, &len, HTTP_IS_DATA_VOLATILE(hs)); |
| } else { |
| err = ERR_OK; |
| } |
| if (err == ERR_OK) { |
| data_to_send = true; |
| #if !LWIP_HTTPD_SSI_INCLUDE_TAG |
| if(hs->tag_started <= hs->file) { |
| /* pretend to have sent the tag, too */ |
| len += hs->tag_end - hs->tag_started; |
| } |
| #endif /* !LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| hs->file += len; |
| hs->left -= len; |
| } |
| } else { |
| #if LWIP_HTTPD_SSI_MULTIPART |
| if(hs->tag_index >= hs->tag_insert_len) { |
| /* Did the last SSIHandler have more to send? */ |
| if (hs->tag_part != HTTPD_LAST_TAG_PART) { |
| /* If so, call it again */ |
| hs->tag_index = 0; |
| get_tag_insert(hs); |
| } |
| } |
| #endif /* LWIP_HTTPD_SSI_MULTIPART */ |
| |
| /* Do we still have insert data left to send? */ |
| if(hs->tag_index < hs->tag_insert_len) { |
| /* We are sending the insert string itself. How much of the |
| * insert can we send? */ |
| if(len > (hs->tag_insert_len - hs->tag_index)) { |
| len = (hs->tag_insert_len - hs->tag_index); |
| } |
| |
| /* Note that we set the copy flag here since we only have a |
| * single tag insert buffer per connection. If we don't do |
| * this, insert corruption can occur if more than one insert |
| * is processed before we call tcp_output. */ |
| err = http_write(pcb, &(hs->tag_insert[hs->tag_index]), &len, |
| HTTP_IS_TAG_VOLATILE(hs)); |
| if (err == ERR_OK) { |
| data_to_send = true; |
| hs->tag_index += len; |
| /* Don't return here: keep on sending data */ |
| } |
| } else { |
| /* We have sent all the insert data so go back to looking for |
| * a new tag. */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Everything sent.\n")); |
| hs->tag_index = 0; |
| hs->tag_state = TAG_NONE; |
| #if !LWIP_HTTPD_SSI_INCLUDE_TAG |
| hs->parsed = hs->tag_end; |
| #endif /* !LWIP_HTTPD_SSI_INCLUDE_TAG*/ |
| } |
| break; |
| } |
| } |
| } |
| |
| /* If we drop out of the end of the for loop, this implies we must have |
| * file data to send so send it now. In TAG_SENDING state, we've already |
| * handled this so skip the send if that's the case. */ |
| if((hs->tag_state != TAG_SENDING) && (hs->parsed > hs->file)) { |
| /* We cannot send more data than space available in the send |
| buffer. */ |
| if (tcp_sndbuf(pcb) < (hs->parsed - hs->file)) { |
| len = tcp_sndbuf(pcb); |
| } else { |
| LWIP_ASSERT("Data size does not fit into u16_t!", |
| (hs->parsed - hs->file) <= 0xffff); |
| len = (u16_t)(hs->parsed - hs->file); |
| } |
| if(len > (2 * tcp_mss(pcb))) { |
| len = 2 * tcp_mss(pcb); |
| } |
| |
| err = http_write(pcb, hs->file, &len, HTTP_IS_DATA_VOLATILE(hs)); |
| if (err == ERR_OK) { |
| data_to_send = true; |
| hs->file += len; |
| hs->left -= len; |
| } |
| } |
| } |
| #endif /* LWIP_HTTPD_SSI */ |
| |
| if((hs->left == 0) && (fs_bytes_left(hs->handle) <= 0)) { |
| /* We reached the end of the file so this request is done. |
| * This adds the FIN flag right into the last data segment. |
| * @todo: don't close here for HTTP/1.1? */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("End of file.\n")); |
| http_close_conn(pcb, hs); |
| return 0; |
| } |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("send_data end.\n")); |
| return data_to_send; |
| } |
| |
| #if LWIP_HTTPD_SUPPORT_EXTSTATUS |
| /** Initialize a http connection with a file to send for an error message |
| * |
| * @param hs http connection state |
| * @param error_nr HTTP error number |
| * @return ERR_OK if file was found and hs has been initialized correctly |
| * another err_t otherwise |
| */ |
| static err_t |
| http_find_error_file(struct http_state *hs, u16_t error_nr) |
| { |
| const char *uri1, *uri2, *uri3; |
| struct fs_file *file; |
| |
| if (error_nr == 501) { |
| uri1 = "/501.html"; |
| uri2 = "/501.htm"; |
| uri3 = "/501.shtml"; |
| } else { |
| /* 400 (bad request is the default) */ |
| uri1 = "/400.html"; |
| uri2 = "/400.htm"; |
| uri3 = "/400.shtml"; |
| } |
| file = fs_open(uri1); |
| if (file == NULL) { |
| file = fs_open(uri2); |
| if (file == NULL) { |
| file = fs_open(uri3); |
| if (file == NULL) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Error page for error %"U16_F" not found\n", |
| error_nr)); |
| return ERR_ARG; |
| } |
| } |
| } |
| return http_init_file(hs, file, 0, NULL); |
| } |
| #else /* LWIP_HTTPD_SUPPORT_EXTSTATUS */ |
| #define http_find_error_file(hs, error_nr) ERR_ARG |
| #endif /* LWIP_HTTPD_SUPPORT_EXTSTATUS */ |
| |
| /** |
| * Get the file struct for a 404 error page. |
| * Tries some file names and returns NULL if none found. |
| * |
| * @param uri pointer that receives the actual file name URI |
| * @return file struct for the error page or NULL no matching file was found |
| */ |
| static struct fs_file * |
| http_get_404_file(const char **uri) |
| { |
| struct fs_file *file; |
| |
| *uri = "/404.html"; |
| file = fs_open(*uri); |
| if(file == NULL) { |
| /* 404.html doesn't exist. Try 404.htm instead. */ |
| *uri = "/404.htm"; |
| file = fs_open(*uri); |
| if(file == NULL) { |
| /* 404.htm doesn't exist either. Try 404.shtml instead. */ |
| *uri = "/404.shtml"; |
| file = fs_open(*uri); |
| if(file == NULL) { |
| /* 404.htm doesn't exist either. Indicate to the caller that it should |
| * send back a default 404 page. |
| */ |
| *uri = NULL; |
| } |
| } |
| } |
| |
| return file; |
| } |
| |
| #if LWIP_HTTPD_SUPPORT_POST |
| static err_t |
| http_handle_post_finished(struct http_state *hs) |
| { |
| /* application error or POST finished */ |
| /* NULL-terminate the buffer */ |
| http_post_response_filename[0] = 0; |
| httpd_post_finished(hs, http_post_response_filename, LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN); |
| return http_find_file(hs, http_post_response_filename, 0); |
| } |
| |
| /** Pass received POST body data to the application and correctly handle |
| * returning a response document or closing the connection. |
| * ATTENTION: The application is responsible for the pbuf now, so don't free it! |
| * |
| * @param hs http connection state |
| * @param p pbuf to pass to the application |
| * @return ERR_OK if passed successfully, another err_t if the response file |
| * hasn't been found (after POST finished) |
| */ |
| static err_t |
| http_post_rxpbuf(struct http_state *hs, struct pbuf *p) |
| { |
| err_t err; |
| |
| /* adjust remaining Content-Length */ |
| if (hs->post_content_len_left < p->tot_len) { |
| hs->post_content_len_left = 0; |
| } else { |
| hs->post_content_len_left -= p->tot_len; |
| } |
| err = httpd_post_receive_data(hs, p); |
| if ((err != ERR_OK) || (hs->post_content_len_left == 0)) { |
| #if LWIP_HTTPD_SUPPORT_POST && LWIP_HTTPD_POST_MANUAL_WND |
| if (hs->unrecved_bytes != 0) { |
| return ERR_OK; |
| } |
| #endif /* LWIP_HTTPD_SUPPORT_POST && LWIP_HTTPD_POST_MANUAL_WND */ |
| /* application error or POST finished */ |
| return http_handle_post_finished(hs); |
| } |
| |
| return ERR_OK; |
| } |
| |
| /** Handle a post request. Called from http_parse_request when method 'POST' |
| * is found. |
| * |
| * @param pcb The tcp_pcb which received this packet. |
| * @param p The input pbuf (containing the POST header and body). |
| * @param hs The http connection state. |
| * @param data HTTP request (header and part of body) from input pbuf(s). |
| * @param data_len Size of 'data'. |
| * @param uri The HTTP URI parsed from input pbuf(s). |
| * @param uri_end Pointer to the end of 'uri' (here, the rest of the HTTP |
| * header starts). |
| * @return ERR_OK: POST correctly parsed and accepted by the application. |
| * ERR_INPROGRESS: POST not completely parsed (no error yet) |
| * another err_t: Error parsing POST or denied by the application |
| */ |
| static err_t |
| http_post_request(struct tcp_pcb *pcb, struct pbuf **inp, struct http_state *hs, |
| char *data, u16_t data_len, char *uri, char *uri_end) |
| { |
| err_t err; |
| /* search for end-of-header (first double-CRLF) */ |
| char* crlfcrlf = strnstr(uri_end + 1, CRLF CRLF, data_len - (uri_end + 1 - data)); |
| |
| #if LWIP_HTTPD_POST_MANUAL_WND |
| hs->pcb = pcb; |
| #else /* LWIP_HTTPD_POST_MANUAL_WND */ |
| LWIP_UNUSED_ARG(pcb); /* only used for LWIP_HTTPD_POST_MANUAL_WND */ |
| #endif /* LWIP_HTTPD_POST_MANUAL_WND */ |
| |
| if (crlfcrlf != NULL) { |
| /* search for "Content-Length: " */ |
| #define HTTP_HDR_CONTENT_LEN "Content-Length: " |
| #define HTTP_HDR_CONTENT_LEN_LEN 16 |
| #define HTTP_HDR_CONTENT_LEN_DIGIT_MAX_LEN 10 |
| char *scontent_len = strnstr(uri_end + 1, HTTP_HDR_CONTENT_LEN, crlfcrlf - (uri_end + 1)); |
| if (scontent_len != NULL) { |
| char *scontent_len_end = strnstr(scontent_len + HTTP_HDR_CONTENT_LEN_LEN, CRLF, HTTP_HDR_CONTENT_LEN_DIGIT_MAX_LEN); |
| if (scontent_len_end != NULL) { |
| int content_len; |
| char *conten_len_num = scontent_len + HTTP_HDR_CONTENT_LEN_LEN; |
| *scontent_len_end = 0; |
| content_len = atoi(conten_len_num); |
| if (content_len > 0) { |
| /* adjust length of HTTP header passed to application */ |
| const char *hdr_start_after_uri = uri_end + 1; |
| u16_t hdr_len = LWIP_MIN(data_len, crlfcrlf + 4 - data); |
| u16_t hdr_data_len = LWIP_MIN(data_len, crlfcrlf + 4 - hdr_start_after_uri); |
| u8_t post_auto_wnd = 1; |
| http_post_response_filename[0] = 0; |
| err = httpd_post_begin(hs, uri, hdr_start_after_uri, hdr_data_len, content_len, |
| http_post_response_filename, LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN, &post_auto_wnd); |
| if (err == ERR_OK) { |
| /* try to pass in data of the first pbuf(s) */ |
| struct pbuf *q = *inp; |
| u16_t start_offset = hdr_len; |
| #if LWIP_HTTPD_POST_MANUAL_WND |
| hs->no_auto_wnd = !post_auto_wnd; |
| #endif /* LWIP_HTTPD_POST_MANUAL_WND */ |
| /* set the Content-Length to be received for this POST */ |
| hs->post_content_len_left = (u32_t)content_len; |
| |
| /* get to the pbuf where the body starts */ |
| while((q != NULL) && (q->len <= start_offset)) { |
| struct pbuf *head = q; |
| start_offset -= q->len; |
| q = q->next; |
| /* free the head pbuf */ |
| head->next = NULL; |
| pbuf_free(head); |
| } |
| *inp = NULL; |
| if (q != NULL) { |
| /* hide the remaining HTTP header */ |
| pbuf_header(q, -(s16_t)start_offset); |
| #if LWIP_HTTPD_POST_MANUAL_WND |
| if (!post_auto_wnd) { |
| /* already tcp_recved() this data... */ |
| hs->unrecved_bytes = q->tot_len; |
| } |
| #endif /* LWIP_HTTPD_POST_MANUAL_WND */ |
| return http_post_rxpbuf(hs, q); |
| } else { |
| return ERR_OK; |
| } |
| } else { |
| /* return file passed from application */ |
| return http_find_file(hs, http_post_response_filename, 0); |
| } |
| } else { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("POST received invalid Content-Length: %s\n", |
| conten_len_num)); |
| return ERR_ARG; |
| } |
| } |
| } |
| } |
| /* if we come here, the POST is incomplete */ |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| return ERR_INPROGRESS; |
| #else /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| return ERR_ARG; |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| } |
| |
| #if LWIP_HTTPD_POST_MANUAL_WND |
| /** A POST implementation can call this function to update the TCP window. |
| * This can be used to throttle data reception (e.g. when received data is |
| * programmed to flash and data is received faster than programmed). |
| * |
| * @param connection A connection handle passed to httpd_post_begin for which |
| * httpd_post_finished has *NOT* been called yet! |
| * @param recved_len Length of data received (for window update) |
| */ |
| void httpd_post_data_recved(void *connection, u16_t recved_len) |
| { |
| struct http_state *hs = (struct http_state*)connection; |
| if (hs != NULL) { |
| if (hs->no_auto_wnd) { |
| u16_t len = recved_len; |
| if (hs->unrecved_bytes >= recved_len) { |
| hs->unrecved_bytes -= recved_len; |
| } else { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_LEVEL_WARNING, ("httpd_post_data_recved: recved_len too big\n")); |
| len = (u16_t)hs->unrecved_bytes; |
| hs->unrecved_bytes = 0; |
| } |
| if (hs->pcb != NULL) { |
| if (len != 0) { |
| tcp_recved(hs->pcb, len); |
| } |
| if ((hs->post_content_len_left == 0) && (hs->unrecved_bytes == 0)) { |
| /* finished handling POST */ |
| http_handle_post_finished(hs); |
| http_send_data(hs->pcb, hs); |
| } |
| } |
| } |
| } |
| } |
| #endif /* LWIP_HTTPD_POST_MANUAL_WND */ |
| |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| |
| /** |
| * When data has been received in the correct state, try to parse it |
| * as a HTTP request. |
| * |
| * @param p the received pbuf |
| * @param hs the connection state |
| * @param pcb the tcp_pcb which received this packet |
| * @return ERR_OK if request was OK and hs has been initialized correctly |
| * ERR_INPROGRESS if request was OK so far but not fully received |
| * another err_t otherwise |
| */ |
| static err_t |
| http_parse_request(struct pbuf **inp, struct http_state *hs, struct tcp_pcb *pcb) |
| { |
| char *data; |
| char *crlf; |
| u16_t data_len; |
| struct pbuf *p = *inp; |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| u16_t clen; |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| #if LWIP_HTTPD_SUPPORT_POST |
| err_t err; |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| |
| LWIP_UNUSED_ARG(pcb); /* only used for post */ |
| LWIP_ASSERT("p != NULL", p != NULL); |
| LWIP_ASSERT("hs != NULL", hs != NULL); |
| |
| if ((hs->handle != NULL) || (hs->file != NULL)) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Received data while sending a file\n")); |
| /* already sending a file */ |
| /* @todo: abort? */ |
| return ERR_USE; |
| } |
| |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Received %"U16_F" bytes\n", p->tot_len)); |
| |
| /* first check allowed characters in this pbuf? */ |
| |
| /* enqueue the pbuf */ |
| if (hs->req == NULL) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("First pbuf\n")); |
| hs->req = p; |
| } else { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("pbuf enqueued\n")); |
| pbuf_cat(hs->req, p); |
| } |
| |
| if (hs->req->next != NULL) { |
| data_len = LWIP_MIN(hs->req->tot_len, LWIP_HTTPD_MAX_REQ_LENGTH); |
| pbuf_copy_partial(hs->req, httpd_req_buf, data_len, 0); |
| data = httpd_req_buf; |
| } else |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| { |
| data = (char *)p->payload; |
| data_len = p->len; |
| if (p->len != p->tot_len) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Warning: incomplete header due to chained pbufs\n")); |
| } |
| } |
| |
| /* received enough data for minimal request? */ |
| if (data_len >= MIN_REQ_LEN) { |
| /* wait for CRLF before parsing anything */ |
| crlf = strnstr(data, CRLF, data_len); |
| if (crlf != NULL) { |
| #if LWIP_HTTPD_SUPPORT_POST |
| int is_post = 0; |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| int is_09 = 0; |
| char *sp1, *sp2; |
| u16_t left_len, uri_len; |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("CRLF received, parsing request\n")); |
| /* parse method */ |
| if (!strncmp(data, "GET ", 4)) { |
| sp1 = data + 3; |
| /* received GET request */ |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Received GET request\"\n")); |
| #if LWIP_HTTPD_SUPPORT_POST |
| } else if (!strncmp(data, "POST ", 5)) { |
| /* store request type */ |
| is_post = 1; |
| sp1 = data + 4; |
| /* received GET request */ |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Received POST request\n")); |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| } else { |
| /* null-terminate the METHOD (pbuf is freed anyway wen returning) */ |
| data[4] = 0; |
| /* unsupported method! */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Unsupported request method (not implemented): \"%s\"\n", |
| data)); |
| return http_find_error_file(hs, 501); |
| } |
| /* if we come here, method is OK, parse URI */ |
| left_len = data_len - ((sp1 +1) - data); |
| sp2 = strnstr(sp1 + 1, " ", left_len); |
| #if LWIP_HTTPD_SUPPORT_V09 |
| if (sp2 == NULL) { |
| /* HTTP 0.9: respond with correct protocol version */ |
| sp2 = strnstr(sp1 + 1, CRLF, left_len); |
| is_09 = 1; |
| #if LWIP_HTTPD_SUPPORT_POST |
| if (is_post) { |
| /* HTTP/0.9 does not support POST */ |
| goto badrequest; |
| } |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| } |
| #endif /* LWIP_HTTPD_SUPPORT_V09 */ |
| uri_len = sp2 - (sp1 + 1); |
| if ((sp2 != 0) && (sp2 > sp1)) { |
| char *uri = sp1 + 1; |
| /* null-terminate the METHOD (pbuf is freed anyway wen returning) */ |
| *sp1 = 0; |
| uri[uri_len] = 0; |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Received \"%s\" request for URI: \"%s\"\n", |
| data, uri)); |
| #if LWIP_HTTPD_SUPPORT_POST |
| if (is_post) { |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| struct pbuf **q = &hs->req; |
| #else /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| struct pbuf **q = inp; |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| err = http_post_request(pcb, q, hs, data, data_len, uri, sp2); |
| if (err != ERR_OK) { |
| /* restore header for next try */ |
| *sp1 = ' '; |
| *sp2 = ' '; |
| uri[uri_len] = ' '; |
| } |
| if (err == ERR_ARG) { |
| goto badrequest; |
| } |
| return err; |
| } else |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| { |
| return http_find_file(hs, uri, is_09); |
| } |
| } else { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("invalid URI\n")); |
| } |
| } |
| } |
| |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| clen = pbuf_clen(hs->req); |
| if ((hs->req->tot_len <= LWIP_HTTPD_REQ_BUFSIZE) && |
| (clen <= LWIP_HTTPD_REQ_QUEUELEN)) { |
| /* request not fully received (too short or CRLF is missing) */ |
| return ERR_INPROGRESS; |
| } else |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| { |
| #if LWIP_HTTPD_SUPPORT_POST |
| badrequest: |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("bad request\n")); |
| /* could not parse request */ |
| return http_find_error_file(hs, 400); |
| } |
| } |
| |
| /** Try to find the file specified by uri and, if found, initialize hs |
| * accordingly. |
| * |
| * @param hs the connection state |
| * @param uri the HTTP header URI |
| * @param is_09 1 if the request is HTTP/0.9 (no HTTP headers in response) |
| * @return ERR_OK if file was found and hs has been initialized correctly |
| * another err_t otherwise |
| */ |
| static err_t |
| http_find_file(struct http_state *hs, const char *uri, int is_09) |
| { |
| size_t loop; |
| struct fs_file *file = NULL; |
| char *params; |
| #if LWIP_HTTPD_CGI |
| int i; |
| int count; |
| #endif /* LWIP_HTTPD_CGI */ |
| |
| #if LWIP_HTTPD_SSI |
| /* |
| * By default, assume we will not be processing server-side-includes |
| * tags |
| */ |
| hs->tag_check = false; |
| #endif /* LWIP_HTTPD_SSI */ |
| |
| /* Have we been asked for the default root file? */ |
| if((uri[0] == '/') && (uri[1] == 0)) { |
| /* Try each of the configured default filenames until we find one |
| that exists. */ |
| for (loop = 0; loop < NUM_DEFAULT_FILENAMES; loop++) { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Looking for %s...\n", g_psDefaultFilenames[loop].name)); |
| file = fs_open((char *)g_psDefaultFilenames[loop].name); |
| uri = (char *)g_psDefaultFilenames[loop].name; |
| if(file != NULL) { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Opened.\n")); |
| #if LWIP_HTTPD_SSI |
| hs->tag_check = g_psDefaultFilenames[loop].shtml; |
| #endif /* LWIP_HTTPD_SSI */ |
| break; |
| } |
| } |
| if (file == NULL) { |
| /* None of the default filenames exist so send back a 404 page */ |
| file = http_get_404_file(&uri); |
| #if LWIP_HTTPD_SSI |
| hs->tag_check = false; |
| #endif /* LWIP_HTTPD_SSI */ |
| } |
| } else { |
| /* No - we've been asked for a specific file. */ |
| /* First, isolate the base URI (without any parameters) */ |
| params = (char *)strchr(uri, '?'); |
| if (params != NULL) { |
| /* URI contains parameters. NULL-terminate the base URI */ |
| *params = '\0'; |
| params++; |
| } |
| |
| #if LWIP_HTTPD_CGI |
| /* Does the base URI we have isolated correspond to a CGI handler? */ |
| if (g_iNumCGIs && g_pCGIs) { |
| for (i = 0; i < g_iNumCGIs; i++) { |
| if (strcmp(uri, g_pCGIs[i].pcCGIName) == 0) { |
| /* |
| * We found a CGI that handles this URI so extract the |
| * parameters and call the handler. |
| */ |
| count = extract_uri_parameters(hs, params); |
| uri = g_pCGIs[i].pfnCGIHandler(i, count, hs->params, |
| hs->param_vals); |
| break; |
| } |
| } |
| } |
| #endif /* LWIP_HTTPD_CGI */ |
| |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("Opening %s\n", uri)); |
| |
| file = fs_open(uri); |
| if (file == NULL) { |
| file = http_get_404_file(&uri); |
| } |
| #if LWIP_HTTPD_SSI |
| if (file != NULL) { |
| /* |
| * See if we have been asked for an shtml file and, if so, |
| * enable tag checking. |
| */ |
| hs->tag_check = false; |
| for (loop = 0; loop < NUM_SHTML_EXTENSIONS; loop++) { |
| if (strstr(uri, g_pcSSIExtensions[loop])) { |
| hs->tag_check = true; |
| break; |
| } |
| } |
| } |
| #endif /* LWIP_HTTPD_SSI */ |
| } |
| return http_init_file(hs, file, is_09, uri); |
| } |
| |
| /** Initialize a http connection with a file to send (if found). |
| * Called by http_find_file and http_find_error_file. |
| * |
| * @param hs http connection state |
| * @param file file structure to send (or NULL if not found) |
| * @param is_09 1 if the request is HTTP/0.9 (no HTTP headers in response) |
| * @param uri the HTTP header URI |
| * @return ERR_OK if file was found and hs has been initialized correctly |
| * another err_t otherwise |
| */ |
| static err_t |
| http_init_file(struct http_state *hs, struct fs_file *file, int is_09, const char *uri) |
| { |
| if (file != NULL) { |
| /* file opened, initialise struct http_state */ |
| #if LWIP_HTTPD_SSI |
| hs->tag_index = 0; |
| hs->tag_state = TAG_NONE; |
| hs->parsed = file->data; |
| hs->parse_left = file->len; |
| hs->tag_end = file->data; |
| #endif /* LWIP_HTTPD_SSI */ |
| hs->handle = file; |
| hs->file = (char*)file->data; |
| LWIP_ASSERT("File length must be positive!", (file->len >= 0)); |
| hs->left = file->len; |
| hs->retries = 0; |
| #if LWIP_HTTPD_TIMING |
| hs->time_started = sys_now(); |
| #endif /* LWIP_HTTPD_TIMING */ |
| #if !LWIP_HTTPD_DYNAMIC_HEADERS |
| LWIP_ASSERT("HTTP headers not included in file system", hs->handle->http_header_included); |
| #endif /* !LWIP_HTTPD_DYNAMIC_HEADERS */ |
| #if LWIP_HTTPD_SUPPORT_V09 |
| if (hs->handle->http_header_included && is_09) { |
| /* HTTP/0.9 responses are sent without HTTP header, |
| search for the end of the header. */ |
| char *file_start = strnstr(hs->file, CRLF CRLF, hs->left); |
| if (file_start != NULL) { |
| size_t diff = file_start + 4 - hs->file; |
| hs->file += diff; |
| hs->left -= (u32_t)diff; |
| } |
| } |
| #endif /* LWIP_HTTPD_SUPPORT_V09*/ |
| } else { |
| hs->handle = NULL; |
| hs->file = NULL; |
| hs->left = 0; |
| hs->retries = 0; |
| } |
| #if LWIP_HTTPD_DYNAMIC_HEADERS |
| /* Determine the HTTP headers to send based on the file extension of |
| * the requested URI. */ |
| if ((hs->handle == NULL) || !hs->handle->http_header_included) { |
| get_http_headers(hs, (char*)uri); |
| } |
| #else /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| LWIP_UNUSED_ARG(uri); |
| #endif /* LWIP_HTTPD_DYNAMIC_HEADERS */ |
| return ERR_OK; |
| } |
| |
| /** |
| * The pcb had an error and is already deallocated. |
| * The argument might still be valid (if != NULL). |
| */ |
| static void |
| http_err(void *arg, err_t err) |
| { |
| struct http_state *hs = (struct http_state *)arg; |
| LWIP_UNUSED_ARG(err); |
| |
| LWIP_DEBUGF(HTTPD_DEBUG, ("http_err: %s", lwip_strerr(err))); |
| |
| if (hs != NULL) { |
| http_state_free(hs); |
| } |
| } |
| |
| /** |
| * Data has been sent and acknowledged by the remote host. |
| * This means that more data can be sent. |
| */ |
| static err_t |
| http_sent(void *arg, struct tcp_pcb *pcb, u16_t len) |
| { |
| struct http_state *hs = (struct http_state *)arg; |
| |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("http_sent %p\n", (void*)pcb)); |
| |
| LWIP_UNUSED_ARG(len); |
| |
| if (hs == NULL) { |
| return ERR_OK; |
| } |
| |
| hs->retries = 0; |
| |
| http_send_data(pcb, hs); |
| |
| return ERR_OK; |
| } |
| |
| /** |
| * The poll function is called every 2nd second. |
| * If there has been no data sent (which resets the retries) in 8 seconds, close. |
| * If the last portion of a file has not been sent in 2 seconds, close. |
| * |
| * This could be increased, but we don't want to waste resources for bad connections. |
| */ |
| static err_t |
| http_poll(void *arg, struct tcp_pcb *pcb) |
| { |
| struct http_state *hs = (struct http_state *)arg; |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("http_poll: pcb=%p hs=%p pcb_state=%s\n", |
| (void*)pcb, (void*)hs, tcp_debug_state_str(pcb->state))); |
| |
| if (hs == NULL) { |
| err_t closed; |
| /* arg is null, close. */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("http_poll: arg is NULL, close\n")); |
| closed = http_close_conn(pcb, hs); |
| LWIP_UNUSED_ARG(closed); |
| #if LWIP_HTTPD_ABORT_ON_CLOSE_MEM_ERROR |
| if (closed == ERR_MEM) { |
| tcp_abort(pcb); |
| return ERR_ABRT; |
| } |
| #endif /* LWIP_HTTPD_ABORT_ON_CLOSE_MEM_ERROR */ |
| return ERR_OK; |
| } else { |
| hs->retries++; |
| if (hs->retries == HTTPD_MAX_RETRIES) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("http_poll: too many retries, close\n")); |
| http_close_conn(pcb, hs); |
| return ERR_OK; |
| } |
| |
| /* If this connection has a file open, try to send some more data. If |
| * it has not yet received a GET request, don't do this since it will |
| * cause the connection to close immediately. */ |
| if(hs && (hs->handle)) { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("http_poll: try to send more data\n")); |
| if(http_send_data(pcb, hs)) { |
| /* If we wrote anything to be sent, go ahead and send it now. */ |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("tcp_output\n")); |
| tcp_output(pcb); |
| } |
| } |
| } |
| |
| return ERR_OK; |
| } |
| |
| /** |
| * Data has been received on this pcb. |
| * For HTTP 1.0, this should normally only happen once (if the request fits in one packet). |
| */ |
| static err_t |
| http_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) |
| { |
| err_t parsed = ERR_ABRT; |
| struct http_state *hs = (struct http_state *)arg; |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("http_recv: pcb=%p pbuf=%p err=%s\n", (void*)pcb, |
| (void*)p, lwip_strerr(err))); |
| |
| if ((err != ERR_OK) || (p == NULL) || (hs == NULL)) { |
| /* error or closed by other side? */ |
| if (p != NULL) { |
| /* Inform TCP that we have taken the data. */ |
| tcp_recved(pcb, p->tot_len); |
| pbuf_free(p); |
| } |
| if (hs == NULL) { |
| /* this should not happen, only to be robust */ |
| LWIP_DEBUGF(HTTPD_DEBUG, ("Error, http_recv: hs is NULL, close\n")); |
| } |
| http_close_conn(pcb, hs); |
| return ERR_OK; |
| } |
| |
| #if LWIP_HTTPD_SUPPORT_POST && LWIP_HTTPD_POST_MANUAL_WND |
| if (hs->no_auto_wnd) { |
| hs->unrecved_bytes += p->tot_len; |
| } else |
| #endif /* LWIP_HTTPD_SUPPORT_POST && LWIP_HTTPD_POST_MANUAL_WND */ |
| { |
| /* Inform TCP that we have taken the data. */ |
| tcp_recved(pcb, p->tot_len); |
| } |
| |
| #if LWIP_HTTPD_SUPPORT_POST |
| if (hs->post_content_len_left > 0) { |
| /* reset idle counter when POST data is received */ |
| hs->retries = 0; |
| /* this is data for a POST, pass the complete pbuf to the application */ |
| http_post_rxpbuf(hs, p); |
| /* pbuf is passed to the application, don't free it! */ |
| if (hs->post_content_len_left == 0) { |
| /* all data received, send response or close connection */ |
| http_send_data(pcb, hs); |
| } |
| return ERR_OK; |
| } else |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| { |
| if (hs->handle == NULL) { |
| parsed = http_parse_request(&p, hs, pcb); |
| LWIP_ASSERT("http_parse_request: unexpected return value", parsed == ERR_OK |
| || parsed == ERR_INPROGRESS ||parsed == ERR_ARG || parsed == ERR_USE); |
| } else { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("http_recv: already sending data\n")); |
| } |
| #if LWIP_HTTPD_SUPPORT_REQUESTLIST |
| if (parsed != ERR_INPROGRESS) { |
| /* request fully parsed or error */ |
| if (hs->req != NULL) { |
| pbuf_free(hs->req); |
| hs->req = NULL; |
| } |
| } |
| #else /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| if (p != NULL) { |
| /* pbuf not passed to application, free it now */ |
| pbuf_free(p); |
| } |
| #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ |
| if (parsed == ERR_OK) { |
| #if LWIP_HTTPD_SUPPORT_POST |
| if (hs->post_content_len_left == 0) |
| #endif /* LWIP_HTTPD_SUPPORT_POST */ |
| { |
| LWIP_DEBUGF(HTTPD_DEBUG | LWIP_DBG_TRACE, ("http_recv: data %p len %"S32_F"\n", hs->file, hs->left)); |
| http_send_data(pcb, hs); |
| } |
| } else if (parsed == ERR_ARG) { |
| /* @todo: close on ERR_USE? */ |
| http_close_conn(pcb, hs); |
| } |
| } |
| return ERR_OK; |
| } |
| |
| /** |
| * A new incoming connection has been accepted. |
| */ |
| static err_t |
| http_accept(void *arg, struct tcp_pcb *pcb, err_t err) |
| { |
| struct http_state *hs; |
| struct tcp_pcb_listen *lpcb = (struct tcp_pcb_listen*)arg; |
| LWIP_UNUSED_ARG(err); |
| LWIP_DEBUGF(HTTPD_DEBUG, ("http_accept %p / %p\n", (void*)pcb, arg)); |
| |
| /* Decrease the listen backlog counter */ |
| tcp_accepted(lpcb); |
| /* Set priority */ |
| tcp_setprio(pcb, HTTPD_TCP_PRIO); |
| |
| /* Allocate memory for the structure that holds the state of the |
| connection - initialized by that function. */ |
| hs = http_state_alloc(); |
| if (hs == NULL) { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("http_accept: Out of memory, RST\n")); |
| return ERR_MEM; |
| } |
| |
| /* Tell TCP that this is the structure we wish to be passed for our |
| callbacks. */ |
| tcp_arg(pcb, hs); |
| |
| /* Set up the various callback functions */ |
| tcp_recv(pcb, http_recv); |
| tcp_err(pcb, http_err); |
| tcp_poll(pcb, http_poll, HTTPD_POLL_INTERVAL); |
| tcp_sent(pcb, http_sent); |
| |
| return ERR_OK; |
| } |
| |
| /** |
| * Initialize the httpd with the specified local address. |
| */ |
| static void |
| httpd_init_addr(ip_addr_t *local_addr) |
| { |
| struct tcp_pcb *pcb; |
| err_t err; |
| |
| pcb = tcp_new(); |
| LWIP_ASSERT("httpd_init: tcp_new failed", pcb != NULL); |
| tcp_setprio(pcb, HTTPD_TCP_PRIO); |
| /* set SOF_REUSEADDR here to explicitly bind httpd to multiple interfaces */ |
| err = tcp_bind(pcb, local_addr, HTTPD_SERVER_PORT); |
| LWIP_ASSERT("httpd_init: tcp_bind failed", err == ERR_OK); |
| pcb = tcp_listen(pcb); |
| LWIP_ASSERT("httpd_init: tcp_listen failed", pcb != NULL); |
| /* initialize callback arg and accept callback */ |
| tcp_arg(pcb, pcb); |
| tcp_accept(pcb, http_accept); |
| } |
| |
| /** |
| * Initialize the httpd: set up a listening PCB and bind it to the defined port |
| */ |
| void |
| httpd_init(void) |
| { |
| #if HTTPD_USE_MEM_POOL |
| LWIP_ASSERT("memp_sizes[MEMP_HTTPD_STATE] >= sizeof(http_state)", |
| memp_sizes[MEMP_HTTPD_STATE] >= sizeof(http_state)); |
| #endif |
| LWIP_DEBUGF(HTTPD_DEBUG, ("httpd_init\n")); |
| |
| httpd_init_addr(IP_ADDR_ANY); |
| } |
| |
| #if LWIP_HTTPD_SSI |
| /** |
| * Set the SSI handler function. |
| * |
| * @param ssi_handler the SSI handler function |
| * @param tags an array of SSI tag strings to search for in SSI-enabled files |
| * @param num_tags number of tags in the 'tags' array |
| */ |
| void |
| http_set_ssi_handler(tSSIHandler ssi_handler, const char **tags, int num_tags) |
| { |
| LWIP_DEBUGF(HTTPD_DEBUG, ("http_set_ssi_handler\n")); |
| |
| LWIP_ASSERT("no ssi_handler given", ssi_handler != NULL); |
| LWIP_ASSERT("no tags given", tags != NULL); |
| LWIP_ASSERT("invalid number of tags", num_tags > 0); |
| |
| g_pfnSSIHandler = ssi_handler; |
| g_ppcTags = tags; |
| g_iNumTags = num_tags; |
| } |
| #endif /* LWIP_HTTPD_SSI */ |
| |
| #if LWIP_HTTPD_CGI |
| /** |
| * Set an array of CGI filenames/handler functions |
| * |
| * @param cgis an array of CGI filenames/handler functions |
| * @param num_handlers number of elements in the 'cgis' array |
| */ |
| void |
| http_set_cgi_handlers(const tCGI *cgis, int num_handlers) |
| { |
| LWIP_ASSERT("no cgis given", cgis != NULL); |
| LWIP_ASSERT("invalid number of handlers", num_handlers > 0); |
| |
| g_pCGIs = cgis; |
| g_iNumCGIs = num_handlers; |
| } |
| #endif /* LWIP_HTTPD_CGI */ |
| |
| #endif /* LWIP_TCP */ |