mirror of
https://github.com/transmission/transmission
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459 lines
12 KiB
C
459 lines
12 KiB
C
/* $Id: miniwget.c,v 1.41 2010/12/12 23:52:02 nanard Exp $ */
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/* Project : miniupnp
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* Author : Thomas Bernard
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* Copyright (c) 2005-2010 Thomas Bernard
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* This software is subject to the conditions detailed in the
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* LICENCE file provided in this distribution. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "miniupnpc.h"
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#ifdef WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include <io.h>
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#define MAXHOSTNAMELEN 64
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#define MIN(x,y) (((x)<(y))?(x):(y))
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#define snprintf _snprintf
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#define socklen_t int
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#if defined(_MSC_VER) && (_MSC_VER >= 1400)
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#define strncasecmp _memicmp
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#else /* defined(_MSC_VER) && (_MSC_VER >= 1400) */
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#define strncasecmp memicmp
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#endif /* defined(_MSC_VER) && (_MSC_VER >= 1400) */
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#else /* #ifdef WIN32 */
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#include <unistd.h>
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#include <sys/param.h>
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#if defined(__amigaos__) && !defined(__amigaos4__)
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#define socklen_t int
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#else /* #if defined(__amigaos__) && !defined(__amigaos4__) */
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#include <sys/select.h>
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#endif /* #else defined(__amigaos__) && !defined(__amigaos4__) */
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#define closesocket close
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/* defining MINIUPNPC_IGNORE_EINTR enable the ignore of interruptions
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* during the connect() call */
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#define MINIUPNPC_IGNORE_EINTR
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#endif /* #else WIN32 */
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#if defined(__sun) || defined(sun)
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#define MIN(x,y) (((x)<(y))?(x):(y))
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#endif
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#include "miniupnpcstrings.h"
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#include "miniwget.h"
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#include "connecthostport.h"
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/*
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* Read a HTTP response from a socket.
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* Process Content-Length and Transfer-encoding headers.
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*/
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void *
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getHTTPResponse(int s, int * size)
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{
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char buf[2048];
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int n;
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int headers = 1;
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int chunked = 0;
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int content_length = -1;
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unsigned int chunksize = 0;
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unsigned int bytestocopy = 0;
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/* buffers : */
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char * header_buf;
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int header_buf_len = 2048;
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int header_buf_used = 0;
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char * content_buf;
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int content_buf_len = 2048;
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int content_buf_used = 0;
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header_buf = malloc(header_buf_len);
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content_buf = malloc(content_buf_len);
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while((n = ReceiveData(s, buf, 2048, 5000)) > 0)
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{
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if(headers)
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{
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int i;
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int linestart=0;
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int colon=0;
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int valuestart=0;
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if(header_buf_used + n > header_buf_len) {
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header_buf = realloc(header_buf, header_buf_used + n);
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header_buf_len = header_buf_used + n;
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}
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memcpy(header_buf + header_buf_used, buf, n);
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header_buf_used += n;
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for(i = 0; i < (header_buf_used-3); i++) {
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if(colon <= linestart && header_buf[i]==':')
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{
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colon = i;
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while(i < (n-3)
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&& (header_buf[i+1] == ' ' || header_buf[i+1] == '\t'))
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i++;
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valuestart = i + 1;
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}
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/* detecting end of line */
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else if(header_buf[i]=='\r' && header_buf[i+1]=='\n')
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{
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if(colon > linestart && valuestart > colon)
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{
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#ifdef DEBUG
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printf("header='%.*s', value='%.*s'\n",
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colon-linestart, header_buf+linestart,
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i-valuestart, header_buf+valuestart);
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#endif
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if(0==strncasecmp(header_buf+linestart, "content-length", colon-linestart))
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{
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content_length = atoi(header_buf+valuestart);
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#ifdef DEBUG
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printf("Content-Length: %d\n", content_length);
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#endif
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}
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else if(0==strncasecmp(header_buf+linestart, "transfer-encoding", colon-linestart)
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&& 0==strncasecmp(buf+valuestart, "chunked", 7))
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{
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#ifdef DEBUG
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printf("chunked transfer-encoding!\n");
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#endif
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chunked = 1;
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}
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}
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linestart = i+2;
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colon = linestart;
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valuestart = 0;
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}
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/* searching for the end of the HTTP headers */
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if(header_buf[i]=='\r' && header_buf[i+1]=='\n'
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&& header_buf[i+2]=='\r' && header_buf[i+3]=='\n')
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{
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headers = 0; /* end */
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i += 4;
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if(i < header_buf_used)
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{
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if(chunked)
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{
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while(i<header_buf_used)
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{
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while(i<header_buf_used && isxdigit(header_buf[i]))
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{
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if(header_buf[i] >= '0' && header_buf[i] <= '9')
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chunksize = (chunksize << 4) + (header_buf[i] - '0');
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else
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chunksize = (chunksize << 4) + ((header_buf[i] | 32) - 'a' + 10);
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i++;
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}
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/* discarding chunk-extension */
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while(i < header_buf_used && header_buf[i] != '\r') i++;
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if(i < header_buf_used && header_buf[i] == '\r') i++;
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if(i < header_buf_used && header_buf[i] == '\n') i++;
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#ifdef DEBUG
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printf("chunksize = %u (%x)\n", chunksize, chunksize);
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#endif
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if(chunksize == 0)
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{
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#ifdef DEBUG
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printf("end of HTTP content !\n");
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#endif
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goto end_of_stream;
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}
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bytestocopy = ((int)chunksize < header_buf_used - i)?chunksize:(header_buf_used - i);
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#ifdef DEBUG
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printf("chunksize=%u bytestocopy=%u (i=%d header_buf_used=%d)\n",
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chunksize, bytestocopy, i, header_buf_used);
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#endif
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if(content_buf_len < (int)(content_buf_used + bytestocopy))
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{
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content_buf = realloc(content_buf, content_buf_used + bytestocopy);
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content_buf_len = content_buf_used + bytestocopy;
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}
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memcpy(content_buf + content_buf_used, header_buf + i, bytestocopy);
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content_buf_used += bytestocopy;
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chunksize -= bytestocopy;
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i += bytestocopy;
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}
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}
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else
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{
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if(content_buf_len < header_buf_used - i)
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{
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content_buf = realloc(content_buf, header_buf_used - i);
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content_buf_len = header_buf_used - i;
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}
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memcpy(content_buf, header_buf + i, header_buf_used - i);
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content_buf_used = header_buf_used - i;
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i = header_buf_used;
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}
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}
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}
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}
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}
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else
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{
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/* content */
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if(chunked)
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{
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int i = 0;
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while(i < n)
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{
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if(chunksize == 0)
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{
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/* reading chunk size */
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if(i<n && buf[i] == '\r') i++;
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if(i<n && buf[i] == '\n') i++;
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while(i<n && isxdigit(buf[i]))
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{
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if(buf[i] >= '0' && buf[i] <= '9')
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chunksize = (chunksize << 4) + (buf[i] - '0');
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else
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chunksize = (chunksize << 4) + ((buf[i] | 32) - 'a' + 10);
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i++;
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}
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while(i<n && buf[i] != '\r') i++; /* discarding chunk-extension */
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if(i<n && buf[i] == '\r') i++;
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if(i<n && buf[i] == '\n') i++;
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#ifdef DEBUG
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printf("chunksize = %u (%x)\n", chunksize, chunksize);
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#endif
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if(chunksize == 0)
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{
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#ifdef DEBUG
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printf("end of HTTP content - %d %d\n", i, n);
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/*printf("'%.*s'\n", n-i, buf+i);*/
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#endif
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goto end_of_stream;
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}
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}
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bytestocopy = ((int)chunksize < n - i)?chunksize:(n - i);
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if((int)(content_buf_used + bytestocopy) > content_buf_len)
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{
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content_buf = (char *)realloc((void *)content_buf,
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content_buf_used + bytestocopy);
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content_buf_len = content_buf_used + bytestocopy;
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}
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memcpy(content_buf + content_buf_used, buf + i, bytestocopy);
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content_buf_used += bytestocopy;
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i += bytestocopy;
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chunksize -= bytestocopy;
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}
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}
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else
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{
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if(content_buf_used + n > content_buf_len)
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{
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content_buf = (char *)realloc((void *)content_buf,
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content_buf_used + n);
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content_buf_len = content_buf_used + n;
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}
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memcpy(content_buf + content_buf_used, buf, n);
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content_buf_used += n;
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}
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}
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if(content_length > 0 && content_buf_used >= content_length)
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{
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#ifdef DEBUG
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printf("End of HTTP content\n");
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#endif
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break;
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}
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}
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end_of_stream:
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free(header_buf); header_buf = NULL;
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*size = content_buf_used;
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if(content_buf_used == 0)
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{
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free(content_buf);
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content_buf = NULL;
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}
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return content_buf;
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}
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/* miniwget3() :
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* do all the work.
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* Return NULL if something failed. */
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static void *
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miniwget3(const char * url, const char * host,
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unsigned short port, const char * path,
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int * size, char * addr_str, int addr_str_len, const char * httpversion)
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{
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char buf[2048];
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int s;
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int n;
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int len;
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int sent;
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*size = 0;
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s = connecthostport(host, port);
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if(s < 0)
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return NULL;
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/* get address for caller ! */
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if(addr_str)
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{
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struct sockaddr saddr;
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socklen_t saddrlen;
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saddrlen = sizeof(saddr);
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if(getsockname(s, &saddr, &saddrlen) < 0)
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{
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perror("getsockname");
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}
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else
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{
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#if defined(__amigaos__) && !defined(__amigaos4__)
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/* using INT WINAPI WSAAddressToStringA(LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFOA, LPSTR, LPDWORD);
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* But his function make a string with the port : nn.nn.nn.nn:port */
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/* if(WSAAddressToStringA((SOCKADDR *)&saddr, sizeof(saddr),
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NULL, addr_str, (DWORD *)&addr_str_len))
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{
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printf("WSAAddressToStringA() failed : %d\n", WSAGetLastError());
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}*/
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strncpy(addr_str, inet_ntoa(((struct sockaddr_in *)&saddr)->sin_addr), addr_str_len);
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#else
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/*inet_ntop(AF_INET, &saddr.sin_addr, addr_str, addr_str_len);*/
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n = getnameinfo(&saddr, saddrlen,
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addr_str, addr_str_len,
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NULL, 0,
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NI_NUMERICHOST | NI_NUMERICSERV);
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if(n != 0) {
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#ifdef WIN32
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fprintf(stderr, "getnameinfo() failed : %d\n", n);
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#else
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fprintf(stderr, "getnameinfo() failed : %s\n", gai_strerror(n));
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#endif
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}
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#endif
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}
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#ifdef DEBUG
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printf("address miniwget : %s\n", addr_str);
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#endif
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}
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len = snprintf(buf, sizeof(buf),
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"GET %s HTTP/%s\r\n"
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"Host: %s:%d\r\n"
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"Connection: Close\r\n"
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"User-Agent: " OS_STRING ", UPnP/1.0, MiniUPnPc/" MINIUPNPC_VERSION_STRING "\r\n"
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"\r\n",
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path, httpversion, host, port);
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sent = 0;
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/* sending the HTTP request */
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while(sent < len)
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{
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n = send(s, buf+sent, len-sent, 0);
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if(n < 0)
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{
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perror("send");
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closesocket(s);
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return NULL;
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}
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else
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{
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sent += n;
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}
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}
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return getHTTPResponse(s, size);
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}
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/* miniwget2() :
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* Call miniwget3(); retry with HTTP/1.1 if 1.0 fails. */
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static void *
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miniwget2(const char * url, const char * host,
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unsigned short port, const char * path,
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int * size, char * addr_str, int addr_str_len)
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{
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char * respbuffer;
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respbuffer = miniwget3(url, host, port, path, size, addr_str, addr_str_len, "1.1");
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/*
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respbuffer = miniwget3(url, host, port, path, size, addr_str, addr_str_len, "1.0");
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if (*size == 0)
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{
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#ifdef DEBUG
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printf("Retrying with HTTP/1.1\n");
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#endif
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free(respbuffer);
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respbuffer = miniwget3(url, host, port, path, size, addr_str, addr_str_len, "1.1");
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}
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*/
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return respbuffer;
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}
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/* parseURL()
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* arguments :
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* url : source string not modified
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* hostname : hostname destination string (size of MAXHOSTNAMELEN+1)
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* port : port (destination)
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* path : pointer to the path part of the URL
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*
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* Return values :
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* 0 - Failure
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* 1 - Success */
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int parseURL(const char * url, char * hostname, unsigned short * port, char * * path)
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{
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char * p1, *p2, *p3;
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p1 = strstr(url, "://");
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if(!p1)
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return 0;
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p1 += 3;
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if( (url[0]!='h') || (url[1]!='t')
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||(url[2]!='t') || (url[3]!='p'))
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return 0;
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p2 = strchr(p1, ':');
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p3 = strchr(p1, '/');
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if(!p3)
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return 0;
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memset(hostname, 0, MAXHOSTNAMELEN + 1);
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if(!p2 || (p2>p3))
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{
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strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p3-p1)));
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*port = 80;
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}
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else
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{
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strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p2-p1)));
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*port = 0;
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p2++;
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while( (*p2 >= '0') && (*p2 <= '9'))
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{
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*port *= 10;
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*port += (unsigned short)(*p2 - '0');
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p2++;
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}
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}
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*path = p3;
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return 1;
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}
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void * miniwget(const char * url, int * size)
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{
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unsigned short port;
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char * path;
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/* protocol://host:port/chemin */
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char hostname[MAXHOSTNAMELEN+1];
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*size = 0;
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if(!parseURL(url, hostname, &port, &path))
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return NULL;
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return miniwget2(url, hostname, port, path, size, 0, 0);
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}
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void * miniwget_getaddr(const char * url, int * size, char * addr, int addrlen)
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{
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unsigned short port;
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char * path;
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/* protocol://host:port/chemin */
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char hostname[MAXHOSTNAMELEN+1];
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*size = 0;
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if(addr)
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addr[0] = '\0';
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if(!parseURL(url, hostname, &port, &path))
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return NULL;
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return miniwget2(url, hostname, port, path, size, addr, addrlen);
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}
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