| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2002, Daniel Stenberg, <daniel@haxx.se>, et al. |
| * |
| * This software is licensed as described in the file COPYING, which |
| * you should have received as part of this distribution. The terms |
| * are also available at http://curl.haxx.se/docs/copyright.html. |
| * |
| * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
| * copies of the Software, and permit persons to whom the Software is |
| * furnished to do so, under the terms of the COPYING file. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| * $Id$ |
| ***************************************************************************/ |
| |
| #include "setup.h" |
| |
| /* -- WIN32 approved -- */ |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdarg.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| |
| #include <errno.h> |
| |
| #include "strequal.h" |
| |
| #if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__) |
| #include <winsock.h> |
| #include <time.h> |
| #include <io.h> |
| #else |
| #ifdef HAVE_SYS_SOCKET_H |
| #include <sys/socket.h> |
| #endif |
| #include <netinet/in.h> |
| #include <sys/time.h> |
| #include <sys/resource.h> |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #include <netdb.h> |
| #ifdef HAVE_ARPA_INET_H |
| #include <arpa/inet.h> |
| #endif |
| #ifdef HAVE_NET_IF_H |
| #include <net/if.h> |
| #endif |
| #include <sys/ioctl.h> |
| #include <signal.h> |
| |
| #ifdef HAVE_SYS_PARAM_H |
| #include <sys/param.h> |
| #endif |
| |
| #ifdef HAVE_SYS_SELECT_H |
| #include <sys/select.h> |
| #endif |
| |
| #ifndef HAVE_SELECT |
| #error "We can't compile without select() support!" |
| #endif |
| #ifndef HAVE_SOCKET |
| #error "We can't compile without socket() support!" |
| #endif |
| |
| #endif |
| |
| #include "urldata.h" |
| #include <curl/curl.h> |
| #include <curl/types.h> |
| #include "netrc.h" |
| |
| #include "content_encoding.h" /* content encoding support. 08/27/02 jhrg */ |
| |
| #include "hostip.h" |
| #include "transfer.h" |
| #include "sendf.h" |
| #include "speedcheck.h" |
| #include "getpass.h" |
| #include "progress.h" |
| #include "getdate.h" |
| #include "http.h" |
| #include "url.h" |
| #include "getinfo.h" |
| #include "ssluse.h" |
| |
| #define _MPRINTF_REPLACE /* use our functions only */ |
| #include <curl/mprintf.h> |
| |
| /* The last #include file should be: */ |
| #ifdef MALLOCDEBUG |
| #include "memdebug.h" |
| #endif |
| |
| #ifndef min |
| #define min(a, b) ((a) < (b) ? (a) : (b)) |
| #endif |
| |
| enum { |
| KEEP_NONE, |
| KEEP_READ, |
| KEEP_WRITE |
| }; |
| |
| |
| /* |
| * compareheader() |
| * |
| * Returns TRUE if 'headerline' contains the 'header' with given 'content'. |
| * Pass headers WITH the colon. |
| */ |
| static bool |
| compareheader(char *headerline, /* line to check */ |
| const char *header, /* header keyword _with_ colon */ |
| const char *content) /* content string to find */ |
| { |
| /* RFC2616, section 4.2 says: "Each header field consists of a name followed |
| * by a colon (":") and the field value. Field names are case-insensitive. |
| * The field value MAY be preceded by any amount of LWS, though a single SP |
| * is preferred." */ |
| |
| size_t hlen = strlen(header); |
| size_t clen; |
| size_t len; |
| char *start; |
| char *end; |
| |
| if(!strnequal(headerline, header, hlen)) |
| return FALSE; /* doesn't start with header */ |
| |
| /* pass the header */ |
| start = &headerline[hlen]; |
| |
| /* pass all white spaces */ |
| while(*start && isspace((int)*start)) |
| start++; |
| |
| /* find the end of the header line */ |
| end = strchr(start, '\r'); /* lines end with CRLF */ |
| if(!end) { |
| /* in case there's a non-standard compliant line here */ |
| end = strchr(start, '\n'); |
| |
| if(!end) |
| /* hm, there's no line ending here, return false and bail out! */ |
| return FALSE; |
| } |
| |
| len = end-start; /* length of the content part of the input line */ |
| clen = strlen(content); /* length of the word to find */ |
| |
| /* find the content string in the rest of the line */ |
| for(;len>=clen;len--, start++) { |
| if(strnequal(start, content, clen)) |
| return TRUE; /* match! */ |
| } |
| |
| return FALSE; /* no match */ |
| } |
| |
| /* We keep this static and global since this is read-only and NEVER |
| changed. It should just remain a blanked-out timeout value. */ |
| static struct timeval notimeout={0,0}; |
| |
| CURLcode Curl_readwrite(struct connectdata *conn, |
| bool *done) |
| { |
| struct Curl_transfer_keeper *k = &conn->keep; |
| struct SessionHandle *data = conn->data; |
| int result; |
| ssize_t nread; /* number of bytes read */ |
| int didwhat=0; |
| |
| /* These two are used only if no other select() or _fdset() have been |
| invoked before this. This typicly happens if you use the multi interface |
| and call curl_multi_perform() without calling curl_multi_fdset() |
| first. */ |
| fd_set extrareadfd; |
| fd_set extrawritefd; |
| |
| fd_set *readfdp = k->readfdp; |
| fd_set *writefdp = k->writefdp; |
| |
| if((k->keepon & KEEP_READ) && !readfdp) { |
| /* reading is requested, but no socket descriptor pointer was set */ |
| FD_ZERO(&extrareadfd); |
| FD_SET(conn->sockfd, &extrareadfd); |
| readfdp = &extrareadfd; |
| |
| /* no write, no exceptions, no timeout */ |
| select(conn->sockfd+1, readfdp, NULL, NULL, ¬imeout); |
| } |
| if((k->keepon & KEEP_WRITE) && !writefdp) { |
| /* writing is requested, but no socket descriptor pointer was set */ |
| FD_ZERO(&extrawritefd); |
| FD_SET(conn->writesockfd, &extrawritefd); |
| writefdp = &extrawritefd; |
| |
| /* no read, no exceptions, no timeout */ |
| select(conn->writesockfd+1, NULL, writefdp, NULL, ¬imeout); |
| } |
| |
| do { |
| /* If we still have reading to do, we check if we have a readable |
| socket. Sometimes the reafdp is NULL, it no fd_set was done using |
| the multi interface and then we can do nothing but to attempt a |
| read to be sure. */ |
| if((k->keepon & KEEP_READ) && |
| (FD_ISSET(conn->sockfd, readfdp))) { |
| |
| /* read! */ |
| result = Curl_read(conn, conn->sockfd, k->buf, |
| data->set.buffer_size? |
| data->set.buffer_size:BUFSIZE -1, |
| &nread); |
| |
| if(0>result) |
| break; /* get out of loop */ |
| if(result>0) |
| return result; |
| |
| if ((k->bytecount == 0) && (k->writebytecount == 0)) |
| Curl_pgrsTime(data, TIMER_STARTTRANSFER); |
| |
| didwhat |= KEEP_READ; |
| |
| /* NULL terminate, allowing string ops to be used */ |
| if (0 < nread) |
| k->buf[nread] = 0; |
| |
| /* if we receive 0 or less here, the server closed the connection and |
| we bail out from this! */ |
| else if (0 >= nread) { |
| k->keepon &= ~KEEP_READ; |
| FD_ZERO(&k->rkeepfd); |
| break; |
| } |
| |
| /* Default buffer to use when we write the buffer, it may be changed |
| in the flow below before the actual storing is done. */ |
| k->str = k->buf; |
| |
| /* Since this is a two-state thing, we check if we are parsing |
| headers at the moment or not. */ |
| if (k->header) { |
| /* we are in parse-the-header-mode */ |
| bool stop_reading = FALSE; |
| |
| /* header line within buffer loop */ |
| do { |
| int hbufp_index; |
| |
| /* str_start is start of line within buf */ |
| k->str_start = k->str; |
| |
| k->end_ptr = strchr (k->str_start, '\n'); |
| |
| if (!k->end_ptr) { |
| /* Not a complete header line within buffer, append the data to |
| the end of the headerbuff. */ |
| |
| if (k->hbuflen + nread >= data->state.headersize) { |
| /* We enlarge the header buffer as it is too small */ |
| char *newbuff; |
| long newsize=MAX((k->hbuflen+nread)*3/2, |
| data->state.headersize*2); |
| hbufp_index = k->hbufp - data->state.headerbuff; |
| newbuff = (char *)realloc(data->state.headerbuff, newsize); |
| if(!newbuff) { |
| failf (data, "Failed to alloc memory for big header!"); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| data->state.headersize=newsize; |
| data->state.headerbuff = newbuff; |
| k->hbufp = data->state.headerbuff + hbufp_index; |
| } |
| memcpy(k->hbufp, k->str, nread); |
| k->hbufp += nread; |
| k->hbuflen += nread; |
| if (!k->headerline && (k->hbuflen>5)) { |
| /* make a first check that this looks like a HTTP header */ |
| if(!checkprefix(data->state.headerbuff, "HTTP/")) { |
| /* this is not the beginning of a HTTP first header line */ |
| k->header = FALSE; |
| k->badheader = HEADER_ALLBAD; |
| break; |
| } |
| } |
| |
| break; /* read more and try again */ |
| } |
| |
| /* decrease the size of the remaining buffer */ |
| nread -= (k->end_ptr - k->str)+1; |
| |
| k->str = k->end_ptr + 1; /* move past new line */ |
| |
| /* |
| * We're about to copy a chunk of data to the end of the |
| * already received header. We make sure that the full string |
| * fit in the allocated header buffer, or else we enlarge |
| * it. |
| */ |
| if (k->hbuflen + (k->str - k->str_start) >= |
| data->state.headersize) { |
| char *newbuff; |
| long newsize=MAX((k->hbuflen+ |
| (k->str-k->str_start))*3/2, |
| data->state.headersize*2); |
| hbufp_index = k->hbufp - data->state.headerbuff; |
| newbuff = (char *)realloc(data->state.headerbuff, newsize); |
| if(!newbuff) { |
| failf (data, "Failed to alloc memory for big header!"); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| data->state.headersize= newsize; |
| data->state.headerbuff = newbuff; |
| k->hbufp = data->state.headerbuff + hbufp_index; |
| } |
| |
| /* copy to end of line */ |
| strncpy (k->hbufp, k->str_start, k->str - k->str_start); |
| k->hbufp += k->str - k->str_start; |
| k->hbuflen += k->str - k->str_start; |
| *k->hbufp = 0; |
| |
| k->p = data->state.headerbuff; |
| |
| /**** |
| * We now have a FULL header line that p points to |
| *****/ |
| |
| if(!k->headerline) { |
| /* the first read header */ |
| if((k->hbuflen>5) && |
| !checkprefix(data->state.headerbuff, "HTTP/")) { |
| /* this is not the beginning of a HTTP first header line */ |
| k->header = FALSE; |
| k->badheader = HEADER_PARTHEADER; |
| break; |
| } |
| } |
| |
| if (('\n' == *k->p) || ('\r' == *k->p)) { |
| int headerlen; |
| /* Zero-length header line means end of headers! */ |
| |
| if ('\r' == *k->p) |
| k->p++; /* pass the \r byte */ |
| if ('\n' == *k->p) |
| k->p++; /* pass the \n byte */ |
| |
| if(100 == k->httpcode) { |
| /* |
| * we have made a HTTP PUT or POST and this is 1.1-lingo |
| * that tells us that the server is OK with this and ready |
| * to receive our stuff. |
| * However, we'll get more headers now so we must get |
| * back into the header-parsing state! |
| */ |
| k->header = TRUE; |
| k->headerline = 0; /* restart the header line counter */ |
| /* if we did wait for this do enable write now! */ |
| if (k->write_after_100_header) { |
| |
| k->write_after_100_header = FALSE; |
| FD_SET (conn->writesockfd, &k->writefd); /* write */ |
| k->keepon |= KEEP_WRITE; |
| k->wkeepfd = k->writefd; |
| } |
| } |
| else |
| k->header = FALSE; /* no more header to parse! */ |
| |
| if (417 == k->httpcode) { |
| /* |
| * we got: "417 Expectation Failed" this means: |
| * we have made a HTTP call and our Expect Header |
| * seems to cause a problem => abort the write operations |
| * (or prevent them from starting). |
| */ |
| k->write_after_100_header = FALSE; |
| k->keepon &= ~KEEP_WRITE; |
| FD_ZERO(&k->wkeepfd); |
| } |
| |
| /* now, only output this if the header AND body are requested: |
| */ |
| k->writetype = CLIENTWRITE_HEADER; |
| if (data->set.http_include_header) |
| k->writetype |= CLIENTWRITE_BODY; |
| |
| headerlen = k->p - data->state.headerbuff; |
| |
| result = Curl_client_write(data, k->writetype, |
| data->state.headerbuff, |
| headerlen); |
| if(result) |
| return result; |
| |
| data->info.header_size += headerlen; |
| conn->headerbytecount += headerlen; |
| |
| if(!k->header) { |
| /* |
| * really end-of-headers. |
| * |
| * If we requested a "no body", this is a good time to get |
| * out and return home. |
| */ |
| if(data->set.no_body) |
| stop_reading = TRUE; |
| else if(!conn->bits.close) { |
| /* If this is not the last request before a close, we must |
| set the maximum download size to the size of the |
| expected document or else, we won't know when to stop |
| reading! */ |
| if(-1 != conn->size) |
| conn->maxdownload = conn->size; |
| } |
| /* If max download size is *zero* (nothing) we already |
| have nothing and can safely return ok now! */ |
| if(0 == conn->maxdownload) |
| stop_reading = TRUE; |
| |
| if(stop_reading) { |
| /* we make sure that this socket isn't read more now */ |
| k->keepon &= ~KEEP_READ; |
| FD_ZERO(&k->rkeepfd); |
| } |
| |
| break; /* exit header line loop */ |
| } |
| |
| /* We continue reading headers, so reset the line-based |
| header parsing variables hbufp && hbuflen */ |
| k->hbufp = data->state.headerbuff; |
| k->hbuflen = 0; |
| continue; |
| } |
| |
| /* |
| * Checks for special headers coming up. |
| */ |
| |
| if (!k->headerline++) { |
| /* This is the first header, it MUST be the error code line |
| or else we consiser this to be the body right away! */ |
| int httpversion_major; |
| int nc=sscanf (k->p, " HTTP/%d.%d %3d", |
| &httpversion_major, |
| &k->httpversion, |
| &k->httpcode); |
| if (nc==3) { |
| k->httpversion += 10 * httpversion_major; |
| } |
| else { |
| /* this is the real world, not a Nirvana |
| NCSA 1.5.x returns this crap when asked for HTTP/1.1 |
| */ |
| nc=sscanf (k->p, " HTTP %3d", &k->httpcode); |
| k->httpversion = 10; |
| } |
| |
| if (nc) { |
| data->info.httpcode = k->httpcode; |
| data->info.httpversion = k->httpversion; |
| |
| /* 404 -> URL not found! */ |
| if (data->set.http_fail_on_error && |
| (k->httpcode >= 400)) { |
| /* If we have been told to fail hard on HTTP-errors, |
| here is the check for that: */ |
| /* serious error, go home! */ |
| failf (data, "The requested file was not found"); |
| return CURLE_HTTP_NOT_FOUND; |
| } |
| |
| if(k->httpversion == 10) |
| /* Default action for HTTP/1.0 must be to close, unless |
| we get one of those fancy headers that tell us the |
| server keeps it open for us! */ |
| conn->bits.close = TRUE; |
| |
| switch(k->httpcode) { |
| case 204: |
| /* (quote from RFC2616, section 10.2.5): The server has |
| * fulfilled the request but does not need to return an |
| * entity-body ... The 204 response MUST NOT include a |
| * message-body, and thus is always terminated by the first |
| * empty line after the header fields. */ |
| /* FALLTHROUGH */ |
| case 304: |
| /* (quote from RFC2616, section 10.3.5): The 304 response MUST |
| * NOT contain a message-body, and thus is always terminated |
| * by the first empty line after the header fields. */ |
| conn->size=0; |
| conn->maxdownload=0; |
| break; |
| default: |
| /* nothing */ |
| break; |
| } |
| } |
| else { |
| k->header = FALSE; /* this is not a header line */ |
| break; |
| } |
| } |
| |
| /* check for Content-Length: header lines to get size */ |
| if (checkprefix("Content-Length:", k->p) && |
| sscanf (k->p+15, " %ld", &k->contentlength)) { |
| conn->size = k->contentlength; |
| Curl_pgrsSetDownloadSize(data, k->contentlength); |
| } |
| /* check for Content-Type: header lines to get the mime-type */ |
| else if (checkprefix("Content-Type:", k->p)) { |
| char *start; |
| char *end; |
| int len; |
| |
| /* Find the first non-space letter */ |
| for(start=k->p+14; |
| *start && isspace((int)*start); |
| start++); |
| |
| /* count all non-space letters following */ |
| for(end=start, len=0; |
| *end && !isspace((int)*end); |
| end++, len++); |
| |
| /* allocate memory of a cloned copy */ |
| data->info.contenttype = malloc(len + 1); |
| if (NULL == data->info.contenttype) |
| return CURLE_OUT_OF_MEMORY; |
| |
| /* copy the content-type string */ |
| memcpy(data->info.contenttype, start, len); |
| data->info.contenttype[len] = 0; /* zero terminate */ |
| } |
| else if((k->httpversion == 10) && |
| conn->bits.httpproxy && |
| compareheader(k->p, "Proxy-Connection:", "keep-alive")) { |
| /* |
| * When a HTTP/1.0 reply comes when using a proxy, the |
| * 'Proxy-Connection: keep-alive' line tells us the |
| * connection will be kept alive for our pleasure. |
| * Default action for 1.0 is to close. |
| */ |
| conn->bits.close = FALSE; /* don't close when done */ |
| infof(data, "HTTP/1.0 proxy connection set to keep alive!\n"); |
| } |
| else if((k->httpversion == 10) && |
| compareheader(k->p, "Connection:", "keep-alive")) { |
| /* |
| * A HTTP/1.0 reply with the 'Connection: keep-alive' line |
| * tells us the connection will be kept alive for our |
| * pleasure. Default action for 1.0 is to close. |
| * |
| * [RFC2068, section 19.7.1] */ |
| conn->bits.close = FALSE; /* don't close when done */ |
| infof(data, "HTTP/1.0 connection set to keep alive!\n"); |
| } |
| else if (compareheader(k->p, "Connection:", "close")) { |
| /* |
| * [RFC 2616, section 8.1.2.1] |
| * "Connection: close" is HTTP/1.1 language and means that |
| * the connection will close when this request has been |
| * served. |
| */ |
| conn->bits.close = TRUE; /* close when done */ |
| } |
| else if (compareheader(k->p, "Transfer-Encoding:", "chunked")) { |
| /* |
| * [RFC 2616, section 3.6.1] A 'chunked' transfer encoding |
| * means that the server will send a series of "chunks". Each |
| * chunk starts with line with info (including size of the |
| * coming block) (terminated with CRLF), then a block of data |
| * with the previously mentioned size. There can be any amount |
| * of chunks, and a chunk-data set to zero signals the |
| * end-of-chunks. */ |
| conn->bits.chunk = TRUE; /* chunks coming our way */ |
| |
| /* init our chunky engine */ |
| Curl_httpchunk_init(conn); |
| } |
| else if (checkprefix("Content-Encoding:", k->p) && |
| data->set.encoding) { |
| /* |
| * Process Content-Encoding. Look for the values: identity, gzip, |
| * defalte, compress, x-gzip and x-compress. x-gzip and |
| * x-compress are the same as gzip and compress. (Sec 3.5 RFC |
| * 2616). zlib cannot handle compress, and gzip is not currently |
| * implemented. However, errors are handled further down when the |
| * response body is processed 08/27/02 jhrg */ |
| char *start; |
| |
| /* Find the first non-space letter */ |
| for(start=k->p+18; |
| *start && isspace((int)*start); |
| start++); |
| |
| /* Record the content-encoding for later use. 08/27/02 jhrg */ |
| if (checkprefix("identity", start)) |
| k->content_encoding = IDENTITY; |
| else if (checkprefix("deflate", start)) |
| k->content_encoding = DEFLATE; |
| else if (checkprefix("gzip", start) |
| || checkprefix("x-gzip", start)) |
| k->content_encoding = GZIP; |
| else if (checkprefix("compress", start) |
| || checkprefix("x-compress", start)) |
| k->content_encoding = COMPRESS; |
| } |
| else if (checkprefix("Content-Range:", k->p)) { |
| if (sscanf (k->p+14, " bytes %d-", &k->offset) || |
| sscanf (k->p+14, " bytes: %d-", &k->offset)) { |
| /* This second format was added August 1st 2000 by Igor |
| Khristophorov since Sun's webserver JavaWebServer/1.1.1 |
| obviously sends the header this way! :-( */ |
| if (conn->resume_from == k->offset) { |
| /* we asked for a resume and we got it */ |
| k->content_range = TRUE; |
| } |
| } |
| } |
| else if(data->cookies && |
| checkprefix("Set-Cookie:", k->p)) { |
| Curl_cookie_add(data->cookies, TRUE, k->p+11, conn->name); |
| } |
| else if(checkprefix("Last-Modified:", k->p) && |
| (data->set.timecondition || data->set.get_filetime) ) { |
| time_t secs=time(NULL); |
| k->timeofdoc = curl_getdate(k->p+strlen("Last-Modified:"), |
| &secs); |
| if(data->set.get_filetime) |
| data->info.filetime = k->timeofdoc; |
| } |
| else if ((k->httpcode >= 300 && k->httpcode < 400) && |
| (data->set.http_follow_location) && |
| checkprefix("Location:", k->p)) { |
| /* this is the URL that the server advices us to get instead */ |
| char *ptr; |
| char *start=k->p; |
| char backup; |
| |
| start += 9; /* pass "Location:" */ |
| |
| /* Skip spaces and tabs. We do this to support multiple |
| white spaces after the "Location:" keyword. */ |
| while(*start && isspace((int)*start )) |
| start++; |
| ptr = start; /* start scanning here */ |
| |
| /* scan through the string to find the end */ |
| while(*ptr && !isspace((int)*ptr)) |
| ptr++; |
| backup = *ptr; /* store the ending letter */ |
| if(ptr != start) { |
| *ptr = '\0'; /* zero terminate */ |
| conn->newurl = strdup(start); /* clone string */ |
| *ptr = backup; /* restore ending letter */ |
| } |
| } |
| |
| /* |
| * End of header-checks. Write them to the client. |
| */ |
| |
| k->writetype = CLIENTWRITE_HEADER; |
| if (data->set.http_include_header) |
| k->writetype |= CLIENTWRITE_BODY; |
| |
| if(data->set.verbose) |
| Curl_debug(data, CURLINFO_HEADER_IN, |
| k->p, k->hbuflen); |
| |
| result = Curl_client_write(data, k->writetype, k->p, |
| k->hbuflen); |
| if(result) |
| return result; |
| |
| data->info.header_size += k->hbuflen; |
| conn->headerbytecount += k->hbuflen; |
| |
| /* reset hbufp pointer && hbuflen */ |
| k->hbufp = data->state.headerbuff; |
| k->hbuflen = 0; |
| } |
| while (!stop_reading && *k->str); /* header line within buffer */ |
| |
| if(stop_reading) |
| /* We've stopped dealing with input, get out of the do-while loop */ |
| break; |
| |
| /* We might have reached the end of the header part here, but |
| there might be a non-header part left in the end of the read |
| buffer. */ |
| |
| } /* end if header mode */ |
| |
| /* This is not an 'else if' since it may be a rest from the header |
| parsing, where the beginning of the buffer is headers and the end |
| is non-headers. */ |
| if (k->str && !k->header && (nread > 0)) { |
| |
| if(0 == k->bodywrites) { |
| /* These checks are only made the first time we are about to |
| write a piece of the body */ |
| if(conn->protocol&PROT_HTTP) { |
| /* HTTP-only checks */ |
| if (conn->newurl) { |
| /* abort after the headers if "follow Location" is set */ |
| infof (data, "Follow to new URL: %s\n", conn->newurl); |
| k->keepon &= ~KEEP_READ; |
| FD_ZERO(&k->rkeepfd); |
| *done = TRUE; |
| return CURLE_OK; |
| } |
| else if (conn->resume_from && |
| !k->content_range && |
| (data->set.httpreq==HTTPREQ_GET)) { |
| /* we wanted to resume a download, although the server |
| doesn't seem to support this and we did this with a GET |
| (if it wasn't a GET we did a POST or PUT resume) */ |
| failf (data, "HTTP server doesn't seem to support " |
| "byte ranges. Cannot resume."); |
| return CURLE_HTTP_RANGE_ERROR; |
| } |
| else if(data->set.timecondition && !conn->range) { |
| /* A time condition has been set AND no ranges have been |
| requested. This seems to be what chapter 13.3.4 of |
| RFC 2616 defines to be the correct action for a |
| HTTP/1.1 client */ |
| if((k->timeofdoc > 0) && (data->set.timevalue > 0)) { |
| switch(data->set.timecondition) { |
| case TIMECOND_IFMODSINCE: |
| default: |
| if(k->timeofdoc < data->set.timevalue) { |
| infof(data, |
| "The requested document is not new enough\n"); |
| *done = TRUE; |
| return CURLE_OK; |
| } |
| break; |
| case TIMECOND_IFUNMODSINCE: |
| if(k->timeofdoc > data->set.timevalue) { |
| infof(data, |
| "The requested document is not old enough\n"); |
| *done = TRUE; |
| return CURLE_OK; |
| } |
| break; |
| } /* switch */ |
| } /* two valid time strings */ |
| } /* we have a time condition */ |
| |
| } /* this is HTTP */ |
| } /* this is the first time we write a body part */ |
| k->bodywrites++; |
| |
| /* pass data to the debug function before it gets "dechunked" */ |
| if(data->set.verbose) { |
| if(k->badheader) { |
| Curl_debug(data, CURLINFO_DATA_IN, data->state.headerbuff, |
| k->hbuflen); |
| if(k->badheader == HEADER_PARTHEADER) |
| Curl_debug(data, CURLINFO_DATA_IN, k->str, nread); |
| } |
| else |
| Curl_debug(data, CURLINFO_DATA_IN, k->str, nread); |
| } |
| |
| if(conn->bits.chunk) { |
| /* |
| * Bless me father for I have sinned. Here comes a chunked |
| * transfer flying and we need to decode this properly. While |
| * the name says read, this function both reads and writes away |
| * the data. The returned 'nread' holds the number of actual |
| * data it wrote to the client. */ |
| CHUNKcode res = |
| Curl_httpchunk_read(conn, k->str, nread, &nread); |
| |
| if(CHUNKE_OK < res) { |
| if(CHUNKE_WRITE_ERROR == res) { |
| failf(data, "Failed writing data"); |
| return CURLE_WRITE_ERROR; |
| } |
| failf(data, "Received problem in the chunky parser"); |
| return CURLE_RECV_ERROR; |
| } |
| else if(CHUNKE_STOP == res) { |
| /* we're done reading chunks! */ |
| k->keepon &= ~KEEP_READ; /* read no more */ |
| FD_ZERO(&k->rkeepfd); |
| |
| /* There are now possibly N number of bytes at the end of the |
| str buffer that weren't written to the client, but we don't |
| care about them right now. */ |
| } |
| /* If it returned OK, we just keep going */ |
| } |
| |
| if((-1 != conn->maxdownload) && |
| (k->bytecount + nread >= conn->maxdownload)) { |
| nread = conn->maxdownload - k->bytecount; |
| if(nread < 0 ) /* this should be unusual */ |
| nread = 0; |
| |
| k->keepon &= ~KEEP_READ; /* we're done reading */ |
| FD_ZERO(&k->rkeepfd); |
| } |
| |
| k->bytecount += nread; |
| |
| Curl_pgrsSetDownloadCounter(data, (double)k->bytecount); |
| |
| if(!conn->bits.chunk && (nread || k->badheader)) { |
| /* If this is chunky transfer, it was already written */ |
| |
| if(k->badheader) { |
| /* we parsed a piece of data wrongly assuming it was a header |
| and now we output it as body instead */ |
| result = Curl_client_write(data, CLIENTWRITE_BODY, |
| data->state.headerbuff, |
| k->hbuflen); |
| } |
| if(k->badheader < HEADER_ALLBAD) { |
| /* This switch handles various content encodings. If there's an |
| error here, be sure to check over the almost identical code in |
| http_chunk.c. 08/29/02 jhrg */ |
| #ifdef HAVE_LIBZ |
| switch (k->content_encoding) { |
| case IDENTITY: |
| #endif |
| /* This is the default when the server sends no |
| Content-Encoding header. See Curl_readwrite_init; the |
| memset() call initializes k->content_encoding to zero. |
| 08/28/02 jhrg */ |
| result = Curl_client_write(data, CLIENTWRITE_BODY, k->str, |
| nread); |
| #ifdef HAVE_LIBZ |
| break; |
| |
| case DEFLATE: |
| /* Assume CLIENTWRITE_BODY; headers are not encoded. */ |
| result = Curl_unencode_deflate_write(data, k, nread); |
| break; |
| |
| case GZIP: /* FIXME 08/27/02 jhrg */ |
| case COMPRESS: |
| default: |
| failf (data, "Unrecognized content encoding type. " |
| "libcurl understands `identity' and `deflate' " |
| "content encodings."); |
| result = CURLE_BAD_CONTENT_ENCODING; |
| break; |
| } |
| #endif |
| } |
| k->badheader = HEADER_NORMAL; /* taken care of now */ |
| |
| if(result) |
| return result; |
| } |
| |
| } /* if (! header and data to read ) */ |
| } /* if( read from socket ) */ |
| |
| /* If we still have writing to do, we check if we have a writable |
| socket. Sometimes the writefdp is NULL, it no fd_set was done using |
| the multi interface and then we can do nothing but to attempt a |
| write to be sure. */ |
| if((k->keepon & KEEP_WRITE) && |
| (FD_ISSET(conn->writesockfd, writefdp)) ) { |
| /* write */ |
| |
| int i, si; |
| ssize_t bytes_written; |
| |
| if ((k->bytecount == 0) && (k->writebytecount == 0)) |
| Curl_pgrsTime(data, TIMER_STARTTRANSFER); |
| |
| didwhat |= KEEP_WRITE; |
| |
| /* only read more data if there's no upload data already |
| present in the upload buffer */ |
| if(0 == conn->upload_present) { |
| /* init the "upload from here" pointer */ |
| conn->upload_fromhere = k->uploadbuf; |
| |
| nread = data->set.fread(conn->upload_fromhere, 1, |
| BUFSIZE, data->set.in); |
| |
| /* the signed int typecase of nread of for systems that has |
| unsigned size_t */ |
| if (nread<=0) { |
| /* done */ |
| k->keepon &= ~KEEP_WRITE; /* we're done writing */ |
| FD_ZERO(&k->wkeepfd); |
| break; |
| } |
| |
| /* store number of bytes available for upload */ |
| conn->upload_present = nread; |
| |
| /* convert LF to CRLF if so asked */ |
| if (data->set.crlf) { |
| for(i = 0, si = 0; i < nread; i++, si++) { |
| if (conn->upload_fromhere[i] == 0x0a) { |
| data->state.scratch[si++] = 0x0d; |
| data->state.scratch[si] = 0x0a; |
| } |
| else |
| data->state.scratch[si] = conn->upload_fromhere[i]; |
| } |
| if(si != nread) { |
| /* only perform the special operation if we really did replace |
| anything */ |
| nread = si; |
| |
| /* upload from the new (replaced) buffer instead */ |
| conn->upload_fromhere = data->state.scratch; |
| |
| /* set the new amount too */ |
| conn->upload_present = nread; |
| } |
| } |
| } |
| else { |
| /* We have a partial buffer left from a previous "round". Use |
| that instead of reading more data */ |
| } |
| |
| /* write to socket */ |
| result = Curl_write(conn, |
| conn->writesockfd, |
| conn->upload_fromhere, |
| conn->upload_present, |
| &bytes_written); |
| if(result) |
| return result; |
| else if(conn->upload_present != bytes_written) { |
| /* we only wrote a part of the buffer (if anything), deal with it! */ |
| |
| /* store the amount of bytes left in the buffer to write */ |
| conn->upload_present -= bytes_written; |
| |
| /* advance the pointer where to find the buffer when the next send |
| is to happen */ |
| conn->upload_fromhere += bytes_written; |
| } |
| else { |
| /* we've uploaded that buffer now */ |
| conn->upload_fromhere = k->uploadbuf; |
| conn->upload_present = 0; /* no more bytes left */ |
| } |
| |
| if(data->set.verbose) |
| Curl_debug(data, CURLINFO_DATA_OUT, conn->upload_fromhere, |
| bytes_written); |
| |
| |
| k->writebytecount += bytes_written; |
| Curl_pgrsSetUploadCounter(data, (double)k->writebytecount); |
| |
| } |
| |
| } while(0); /* just to break out from! */ |
| |
| if(didwhat) { |
| /* Update read/write counters */ |
| if(conn->bytecountp) |
| *conn->bytecountp = k->bytecount; /* read count */ |
| if(conn->writebytecountp) |
| *conn->writebytecountp = k->writebytecount; /* write count */ |
| } |
| else { |
| /* no read no write, this is a timeout? */ |
| if (k->write_after_100_header) { |
| /* This should allow some time for the header to arrive, but only a |
| very short time as otherwise it'll be too much wasted times too |
| often. */ |
| k->write_after_100_header = FALSE; |
| FD_SET (conn->writesockfd, &k->writefd); /* write socket */ |
| k->keepon |= KEEP_WRITE; |
| k->wkeepfd = k->writefd; |
| } |
| } |
| |
| k->now = Curl_tvnow(); |
| if(Curl_pgrsUpdate(conn)) |
| result = CURLE_ABORTED_BY_CALLBACK; |
| else |
| result = Curl_speedcheck (data, k->now); |
| if (result) |
| return result; |
| |
| if (data->set.timeout && |
| ((Curl_tvdiff(k->now, k->start)/1000) >= data->set.timeout)) { |
| failf (data, "Operation timed out with %d out of %d bytes received", |
| k->bytecount, conn->size); |
| return CURLE_OPERATION_TIMEOUTED; |
| } |
| |
| if(!k->keepon) { |
| /* |
| * The transfer has been performed. Just make some general checks before |
| * returning. |
| */ |
| |
| if(!(data->set.no_body) && k->contentlength && |
| (k->bytecount != k->contentlength) && |
| !conn->newurl) { |
| failf(data, "transfer closed with %d bytes remaining to read", |
| k->contentlength-k->bytecount); |
| return CURLE_PARTIAL_FILE; |
| } |
| else if(conn->bits.chunk && conn->proto.http->chunk.datasize) { |
| failf(data, "transfer closed with at least %d bytes remaining", |
| conn->proto.http->chunk.datasize); |
| return CURLE_PARTIAL_FILE; |
| } |
| if(Curl_pgrsUpdate(conn)) |
| return CURLE_ABORTED_BY_CALLBACK; |
| } |
| |
| /* Now update the "done" boolean we return */ |
| *done = !k->keepon; |
| |
| return CURLE_OK; |
| } |
| |
| CURLcode Curl_readwrite_init(struct connectdata *conn) |
| { |
| struct SessionHandle *data = conn->data; |
| struct Curl_transfer_keeper *k = &conn->keep; |
| |
| /* NB: the content encoding software depends on this initialization of |
| Curl_transfer_keeper. 08/28/02 jhrg */ |
| memset(k, 0, sizeof(struct Curl_transfer_keeper)); |
| |
| k->start = Curl_tvnow(); /* start time */ |
| k->now = k->start; /* current time is now */ |
| k->header = TRUE; /* assume header */ |
| k->httpversion = -1; /* unknown at this point */ |
| |
| data = conn->data; /* there's the root struct */ |
| k->buf = data->state.buffer; |
| k->uploadbuf = data->state.uploadbuffer; |
| k->maxfd = (conn->sockfd>conn->writesockfd? |
| conn->sockfd:conn->writesockfd)+1; |
| k->hbufp = data->state.headerbuff; |
| |
| Curl_pgrsTime(data, TIMER_PRETRANSFER); |
| Curl_speedinit(data); |
| |
| Curl_pgrsSetUploadCounter(data, 0); |
| Curl_pgrsSetDownloadCounter(data, 0); |
| |
| if (!conn->getheader) { |
| k->header = FALSE; |
| if(conn->size > 0) |
| Curl_pgrsSetDownloadSize(data, conn->size); |
| } |
| /* we want header and/or body, if neither then don't do this! */ |
| if(conn->getheader || !data->set.no_body) { |
| |
| FD_ZERO (&k->readfd); /* clear it */ |
| if(conn->sockfd != -1) { |
| FD_SET (conn->sockfd, &k->readfd); /* read socket */ |
| k->keepon |= KEEP_READ; |
| } |
| |
| FD_ZERO (&k->writefd); /* clear it */ |
| if(conn->writesockfd != -1) { |
| if (data->set.expect100header) |
| /* wait with write until we either got 100-continue or a timeout */ |
| k->write_after_100_header = TRUE; |
| else { |
| FD_SET (conn->writesockfd, &k->writefd); /* write socket */ |
| k->keepon |= KEEP_WRITE; |
| } |
| } |
| |
| /* get these in backup variables to be able to restore them on each lap in |
| the select() loop */ |
| k->rkeepfd = k->readfd; |
| k->wkeepfd = k->writefd; |
| |
| } |
| |
| return CURLE_OK; |
| } |
| |
| void Curl_single_fdset(struct connectdata *conn, |
| fd_set *read_fd_set, |
| fd_set *write_fd_set, |
| fd_set *exc_fd_set, |
| int *max_fd) |
| { |
| *max_fd = -1; /* init */ |
| if(conn->keep.keepon & KEEP_READ) { |
| FD_SET(conn->sockfd, read_fd_set); |
| *max_fd = conn->sockfd; |
| conn->keep.readfdp = read_fd_set; /* store the address of the set */ |
| } |
| if(conn->keep.keepon & KEEP_WRITE) { |
| FD_SET(conn->writesockfd, write_fd_set); |
| if(conn->writesockfd > *max_fd) |
| *max_fd = conn->writesockfd; |
| conn->keep.writefdp = write_fd_set; /* store the address of the set */ |
| } |
| /* we don't use exceptions, only touch that one to prevent compiler |
| warnings! */ |
| *exc_fd_set = *exc_fd_set; |
| } |
| |
| |
| /* |
| * Transfer() |
| * |
| * This function is what performs the actual transfer. It is capable of |
| * doing both ways simultaneously. |
| * The transfer must already have been setup by a call to Curl_Transfer(). |
| * |
| * Note that headers are created in a preallocated buffer of a default size. |
| * That buffer can be enlarged on demand, but it is never shrinken again. |
| * |
| * Parts of this function was once written by the friendly Mark Butler |
| * <butlerm@xmission.com>. |
| */ |
| |
| static CURLcode |
| Transfer(struct connectdata *conn) |
| { |
| struct SessionHandle *data = conn->data; |
| CURLcode result; |
| struct Curl_transfer_keeper *k = &conn->keep; |
| bool done=FALSE; |
| |
| Curl_readwrite_init(conn); |
| |
| if((conn->sockfd == -1) && (conn->writesockfd == -1)) |
| /* nothing to read, nothing to write, we're already OK! */ |
| return CURLE_OK; |
| |
| /* we want header and/or body, if neither then don't do this! */ |
| if(!conn->getheader && data->set.no_body) |
| return CURLE_OK; |
| |
| k->writefdp = &k->writefd; /* store the address of the set */ |
| k->readfdp = &k->readfd; /* store the address of the set */ |
| |
| while (!done) { |
| struct timeval interval; |
| k->readfd = k->rkeepfd; /* set these every lap in the loop */ |
| k->writefd = k->wkeepfd; |
| interval.tv_sec = 1; |
| interval.tv_usec = 0; |
| |
| switch (select (k->maxfd, k->readfdp, k->writefdp, NULL, &interval)) { |
| case -1: /* select() error, stop reading */ |
| #ifdef EINTR |
| /* The EINTR is not serious, and it seems you might get this more |
| ofen when using the lib in a multi-threaded environment! */ |
| if(errno == EINTR) |
| ; |
| else |
| #endif |
| done = TRUE; /* no more read or write */ |
| continue; |
| case 0: /* timeout */ |
| result = Curl_readwrite(conn, &done); |
| break; |
| |
| default: /* readable descriptors */ |
| result = Curl_readwrite(conn, &done); |
| break; |
| } |
| if(result) |
| return result; |
| |
| /* "done" signals to us if the transfer(s) are ready */ |
| } |
| |
| return CURLE_OK; |
| } |
| |
| CURLcode Curl_pretransfer(struct SessionHandle *data) |
| { |
| if(!data->change.url) |
| /* we can't do anything wihout URL */ |
| return CURLE_URL_MALFORMAT; |
| |
| #ifdef USE_SSLEAY |
| /* Init the SSL session ID cache here. We do it here since we want to |
| do it after the *_setopt() calls (that could change the size) but |
| before any transfer. */ |
| Curl_SSL_InitSessions(data, data->set.ssl.numsessions); |
| #endif |
| |
| data->set.followlocation=0; /* reset the location-follow counter */ |
| data->state.this_is_a_follow = FALSE; /* reset this */ |
| data->state.errorbuf = FALSE; /* no error has occurred */ |
| |
| /* If there was a list of cookie files to read and we haven't done it before, |
| do it now! */ |
| if(data->change.cookielist) { |
| struct curl_slist *list = data->change.cookielist; |
| while(list) { |
| data->cookies = Curl_cookie_init(list->data, |
| data->cookies, |
| data->set.cookiesession); |
| list = list->next; |
| } |
| curl_slist_free_all(data->change.cookielist); /* clean up list */ |
| data->change.cookielist = NULL; /* don't do this again! */ |
| } |
| |
| |
| |
| /* Allow data->set.use_port to set which port to use. This needs to be |
| * disabled for example when we follow Location: headers to URLs using |
| * different ports! */ |
| data->state.allow_port = TRUE; |
| |
| #if defined(HAVE_SIGNAL) && defined(SIGPIPE) |
| /************************************************************* |
| * Tell signal handler to ignore SIGPIPE |
| *************************************************************/ |
| if(!data->set.no_signal) |
| data->state.prev_signal = signal(SIGPIPE, SIG_IGN); |
| #endif |
| |
| Curl_initinfo(data); /* reset session-specific information "variables" */ |
| Curl_pgrsStartNow(data); |
| |
| return CURLE_OK; |
| } |
| |
| CURLcode Curl_posttransfer(struct SessionHandle *data) |
| { |
| #if defined(HAVE_SIGNAL) && defined(SIGPIPE) |
| /* restore the signal handler for SIGPIPE before we get back */ |
| if(!data->set.no_signal) |
| signal(SIGPIPE, data->state.prev_signal); |
| #endif |
| |
| return CURLE_OK; |
| } |
| |
| CURLcode Curl_follow(struct SessionHandle *data, |
| char *newurl) /* this 'newurl' is the Location: string, |
| and it must be malloc()ed before passed |
| here */ |
| { |
| /* Location: redirect */ |
| char prot[16]; /* URL protocol string storage */ |
| char letter; /* used for a silly sscanf */ |
| |
| if (data->set.maxredirs && |
| (data->set.followlocation >= data->set.maxredirs)) { |
| failf(data,"Maximum (%d) redirects followed", data->set.maxredirs); |
| return CURLE_TOO_MANY_REDIRECTS; |
| } |
| |
| /* mark the next request as a followed location: */ |
| data->state.this_is_a_follow = TRUE; |
| |
| data->set.followlocation++; /* count location-followers */ |
| |
| if(data->set.http_auto_referer) { |
| /* We are asked to automatically set the previous URL as the |
| referer when we get the next URL. We pick the ->url field, |
| which may or may not be 100% correct */ |
| |
| if(data->change.referer_alloc) |
| /* If we already have an allocated referer, free this first */ |
| free(data->change.referer); |
| |
| data->change.referer = strdup(data->change.url); |
| data->change.referer_alloc = TRUE; /* yes, free this later */ |
| } |
| |
| if(2 != sscanf(newurl, "%15[^?&/:]://%c", prot, &letter)) { |
| /*** |
| *DANG* this is an RFC 2068 violation. The URL is supposed |
| to be absolute and this doesn't seem to be that! |
| *** |
| Instead, we have to TRY to append this new path to the old URL |
| to the right of the host part. Oh crap, this is doomed to cause |
| problems in the future... |
| */ |
| char *protsep; |
| char *pathsep; |
| char *newest; |
| |
| char *useurl = newurl; |
| |
| /* we must make our own copy of the URL to play with, as it may |
| point to read-only data */ |
| char *url_clone=strdup(data->change.url); |
| |
| if(!url_clone) |
| return CURLE_OUT_OF_MEMORY; /* skip out of this NOW */ |
| |
| /* protsep points to the start of the host name */ |
| protsep=strstr(url_clone, "//"); |
| if(!protsep) |
| protsep=url_clone; |
| else |
| protsep+=2; /* pass the slashes */ |
| |
| if('/' != newurl[0]) { |
| int level=0; |
| |
| /* First we need to find out if there's a ?-letter in the URL, |
| and cut it and the right-side of that off */ |
| pathsep = strrchr(protsep, '?'); |
| if(pathsep) |
| *pathsep=0; |
| |
| /* we have a relative path to append to the last slash if |
| there's one available */ |
| pathsep = strrchr(protsep, '/'); |
| if(pathsep) |
| *pathsep=0; |
| |
| /* Check if there's any slash after the host name, and if so, |
| remember that position instead */ |
| pathsep = strchr(protsep, '/'); |
| if(pathsep) |
| protsep = pathsep+1; |
| else |
| protsep = NULL; |
| |
| /* now deal with one "./" or any amount of "../" in the newurl |
| and act accordingly */ |
| |
| if((useurl[0] == '.') && (useurl[1] == '/')) |
| useurl+=2; /* just skip the "./" */ |
| |
| while((useurl[0] == '.') && |
| (useurl[1] == '.') && |
| (useurl[2] == '/')) { |
| level++; |
| useurl+=3; /* pass the "../" */ |
| } |
| |
| if(protsep) { |
| while(level--) { |
| /* cut off one more level from the right of the original URL */ |
| pathsep = strrchr(protsep, '/'); |
| if(pathsep) |
| *pathsep=0; |
| else { |
| *protsep=0; |
| break; |
| } |
| } |
| } |
| } |
| else { |
| /* We got a new absolute path for this server, cut off from the |
| first slash */ |
| pathsep = strchr(protsep, '/'); |
| if(pathsep) |
| *pathsep=0; |
| } |
| |
| newest=(char *)malloc( strlen(url_clone) + |
| 1 + /* possible slash */ |
| strlen(useurl) + 1/* zero byte */); |
| |
| if(!newest) |
| return CURLE_OUT_OF_MEMORY; /* go out from this */ |
| |
| sprintf(newest, "%s%s%s", url_clone, |
| (('/' == useurl[0]) || (protsep && !*protsep))?"":"/", |
| useurl); |
| free(newurl); /* newurl is the allocated pointer */ |
| free(url_clone); |
| newurl = newest; |
| } |
| else |
| /* This is an absolute URL, don't allow the custom port number */ |
| data->state.allow_port = FALSE; |
| |
| if(data->change.url_alloc) |
| free(data->change.url); |
| else |
| data->change.url_alloc = TRUE; /* the URL is allocated */ |
| |
| /* TBD: set the URL with curl_setopt() */ |
| data->change.url = newurl; |
| newurl = NULL; /* don't free! */ |
| |
| infof(data, "Follows Location: to new URL: '%s'\n", data->change.url); |
| |
| /* |
| * We get here when the HTTP code is 300-399. We need to perform |
| * differently based on exactly what return code there was. |
| * Discussed on the curl mailing list and posted about on the 26th |
| * of January 2001. |
| */ |
| switch(data->info.httpcode) { |
| case 300: /* Multiple Choices */ |
| case 306: /* Not used */ |
| case 307: /* Temporary Redirect */ |
| default: /* for all unknown ones */ |
| /* These are explicitly mention since I've checked RFC2616 and they |
| * seem to be OK to POST to. |
| */ |
| break; |
| case 301: /* Moved Permanently */ |
| /* (quote from RFC2616, section 10.3.2): |
| * |
| * Note: When automatically redirecting a POST request after |
| * receiving a 301 status code, some existing HTTP/1.0 user agents |
| * will erroneously change it into a GET request. |
| * |
| * ---- |
| * Warning: Because most of importants user agents do this clear |
| * RFC2616 violation, many webservers expect this misbehavior. So |
| * these servers often answers to a POST request with an error page. |
| * To be sure that libcurl gets the page that most user agents |
| * would get, libcurl has to force GET: |
| */ |
| if( data->set.httpreq == HTTPREQ_POST |
| || data->set.httpreq == HTTPREQ_POST_FORM) { |
| infof(data, |
| "Violate RFC 2616/10.3.2 and switch from POST to GET\n"); |
| data->set.httpreq = HTTPREQ_GET; |
| } |
| break; |
| case 302: /* Found */ |
| /* (From 10.3.3) |
| |
| Note: RFC 1945 and RFC 2068 specify that the client is not allowed |
| to change the method on the redirected request. However, most |
| existing user agent implementations treat 302 as if it were a 303 |
| response, performing a GET on the Location field-value regardless |
| of the original request method. The status codes 303 and 307 have |
| been added for servers that wish to make unambiguously clear which |
| kind of reaction is expected of the client. |
| |
| (From 10.3.4) |
| |
| Note: Many pre-HTTP/1.1 user agents do not understand the 303 |
| status. When interoperability with such clients is a concern, the |
| 302 status code may be used instead, since most user agents react |
| to a 302 response as described here for 303. |
| */ |
| case 303: /* See Other */ |
| /* Disable both types of POSTs, since doing a second POST when |
| * following isn't what anyone would want! */ |
| if(data->set.httpreq != HTTPREQ_GET) { |
| data->set.httpreq = HTTPREQ_GET; /* enforce GET request */ |
| infof(data, "Disables POST, goes with %s\n", |
| data->set.no_body?"HEAD":"GET"); |
| } |
| break; |
| case 304: /* Not Modified */ |
| /* 304 means we did a conditional request and it was "Not modified". |
| * We shouldn't get any Location: header in this response! |
| */ |
| break; |
| case 305: /* Use Proxy */ |
| /* (quote from RFC2616, section 10.3.6): |
| * "The requested resource MUST be accessed through the proxy given |
| * by the Location field. The Location field gives the URI of the |
| * proxy. The recipient is expected to repeat this single request |
| * via the proxy. 305 responses MUST only be generated by origin |
| * servers." |
| */ |
| break; |
| } |
| Curl_pgrsTime(data, TIMER_REDIRECT); |
| Curl_pgrsResetTimes(data); |
| |
| return CURLE_OK; |
| } |
| |
| CURLcode Curl_perform(struct SessionHandle *data) |
| { |
| CURLcode res; |
| CURLcode res2; |
| struct connectdata *conn=NULL; |
| char *newurl = NULL; /* possibly a new URL to follow to! */ |
| |
| data->state.used_interface = Curl_if_easy; |
| |
| res = Curl_pretransfer(data); |
| if(res) |
| return res; |
| |
| /* |
| * It is important that there is NO 'return' from this function at any other |
| * place than falling down to the end of the function! This is because we |
| * have cleanup stuff that must be done before we get back, and that is only |
| * performed after this do-while loop. |
| */ |
| |
| do { |
| Curl_pgrsTime(data, TIMER_STARTSINGLE); |
| res = Curl_connect(data, &conn); |
| if(res == CURLE_OK) { |
| res = Curl_do(&conn); |
| |
| if(res == CURLE_OK) { |
| CURLcode res2; /* just a local extra result container */ |
| |
| if(conn->protocol&PROT_FTPS) |
| /* FTPS, disable ssl while transfering data */ |
| conn->ssl.use = FALSE; |
| res = Transfer(conn); /* now fetch that URL please */ |
| if(conn->protocol&PROT_FTPS) |
| /* FTPS, enable ssl again after havving transferred data */ |
| conn->ssl.use = TRUE; |
| |
| if(res == CURLE_OK) |
| /* |
| * We must duplicate the new URL here as the connection data |
| * may be free()ed in the Curl_done() function. |
| */ |
| newurl = conn->newurl?strdup(conn->newurl):NULL; |
| else { |
| /* The transfer phase returned error, we mark the connection to get |
| * closed to prevent being re-used. This is becasue we can't |
| * possibly know if the connection is in a good shape or not now. */ |
| conn->bits.close = TRUE; |
| |
| if(-1 !=conn->secondarysocket) { |
| /* if we failed anywhere, we must clean up the secondary socket if |
| it was used */ |
| sclose(conn->secondarysocket); |
| conn->secondarysocket=-1; |
| } |
| } |
| |
| /* Always run Curl_done(), even if some of the previous calls |
| failed, but return the previous (original) error code */ |
| res2 = Curl_done(conn); |
| |
| if(CURLE_OK == res) |
| res = res2; |
| } |
| |
| /* |
| * Important: 'conn' cannot be used here, since it may have been closed |
| * in 'Curl_done' or other functions. |
| */ |
| |
| if((res == CURLE_OK) && newurl) { |
| res = Curl_follow(data, newurl); |
| if(CURLE_OK == res) { |
| newurl = NULL; |
| continue; |
| } |
| } |
| } |
| break; /* it only reaches here when this shouldn't loop */ |
| |
| } while(1); /* loop if Location: */ |
| |
| if(newurl) |
| free(newurl); |
| |
| /* run post-transfer uncondionally, but don't clobber the return code if |
| we already have an error code recorder */ |
| res2 = Curl_posttransfer(data); |
| if(!res && res2) |
| res = res2; |
| |
| return res; |
| } |
| |
| CURLcode |
| Curl_Transfer(struct connectdata *c_conn, /* connection data */ |
| int sockfd, /* socket to read from or -1 */ |
| int size, /* -1 if unknown at this point */ |
| bool getheader, /* TRUE if header parsing is wanted */ |
| long *bytecountp, /* return number of bytes read or NULL */ |
| int writesockfd, /* socket to write to, it may very well be |
| the same we read from. -1 disables */ |
| long *writebytecountp /* return number of bytes written or |
| NULL */ |
| ) |
| { |
| struct connectdata *conn = (struct connectdata *)c_conn; |
| if(!conn) |
| return CURLE_BAD_FUNCTION_ARGUMENT; |
| |
| /* now copy all input parameters */ |
| conn->sockfd = sockfd; |
| conn->size = size; |
| conn->getheader = getheader; |
| conn->bytecountp = bytecountp; |
| conn->writesockfd = writesockfd; |
| conn->writebytecountp = writebytecountp; |
| |
| return CURLE_OK; |
| |
| } |
| |
| /* |
| * local variables: |
| * eval: (load-file "../curl-mode.el") |
| * end: |
| * vim600: fdm=marker |
| * vim: et sw=2 ts=2 sts=2 tw=78 |
| */ |
