From a6163888f3c56123b1db313743c6147ba498732c Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Fri, 8 Aug 2014 14:42:07 +0300 Subject: Add third_party libs --- third_party/lwip-1.4.1/apps/httpserver_raw/httpd.c | 2184 ++++++++++++++++++++ 1 file changed, 2184 insertions(+) create mode 100644 third_party/lwip-1.4.1/apps/httpserver_raw/httpd.c (limited to 'third_party/lwip-1.4.1/apps/httpserver_raw/httpd.c') diff --git a/third_party/lwip-1.4.1/apps/httpserver_raw/httpd.c b/third_party/lwip-1.4.1/apps/httpserver_raw/httpd.c new file mode 100644 index 0000000..9e59267 --- /dev/null +++ b/third_party/lwip-1.4.1/apps/httpserver_raw/httpd.c @@ -0,0 +1,2184 @@ +/* + * 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 + * + */ + +/* This httpd supports for a + * rudimentary server-side-include facility which will replace tags of the form + * 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 "". + * 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/opt.h" +#include "lwip/stats.h" +#include "httpd.h" +#include "httpd_structs.h" +#include "lwip/tcp.h" +#include "fs.h" + +#include +#include + +#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_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 = ""; +#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 to 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 "" 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 "***UNKNOWN TAG " +#define UNKNOWN_TAG1_LEN 18 +#define UNKNOWN_TAG2_TEXT "***" +#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 */ -- cgit v1.3.1