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miniupnp/miniupnpc/miniwget.c

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/* $Id: miniwget.c,v 1.82 2020/05/29 21:14:22 nanard Exp $ */
/* Project : miniupnp
* Website : http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
* Author : Thomas Bernard
* Copyright (c) 2005-2020 Thomas Bernard
* This software is subject to the conditions detailed in the
* LICENCE file provided in this distribution. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include <io.h>
#define MAXHOSTNAMELEN 64
/* snprintf is supported by Visual Studio 2015, mingw-w64 8.0.0, mingw-w64 with ucrt, mingw-w64 or mingw32 with ansi stdio */
#if (defined(_MSC_VER) && _MSC_VER < 1900) || (defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 8 && !defined(_UCRT) && !defined(__USE_MINGW_ANSI_STDIO)) || (defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) && !defined(__USE_MINGW_ANSI_STDIO))
/* _snprintf does not fill nul byte at the end of buffer and returns -1 on overflow */
#define snprintf(buf, size, fmt, ...) ((_snprintf((buf), (size), (fmt), __VA_ARGS__), (((char *)buf)[(size_t)(size)-1] = 0), _scprintf((fmt), __VA_ARGS__)))
#endif
#define socklen_t int
#ifndef strncasecmp
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
#define strncasecmp _memicmp
#else /* defined(_MSC_VER) && (_MSC_VER >= 1400) */
#define strncasecmp memicmp
#endif /* defined(_MSC_VER) && (_MSC_VER >= 1400) */
#endif /* #ifndef strncasecmp */
#else /* #ifdef _WIN32 */
#include <unistd.h>
#include <sys/param.h>
#if defined(__amigaos__) && !defined(__amigaos4__)
#define socklen_t int
#else /* #if defined(__amigaos__) && !defined(__amigaos4__) */
#include <sys/select.h>
#endif /* #else defined(__amigaos__) && !defined(__amigaos4__) */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netdb.h>
#define closesocket close
#include <strings.h>
#endif /* #else _WIN32 */
#ifdef __GNU__
#define MAXHOSTNAMELEN 64
#endif /* __GNU__ */
#ifndef MIN
#define MIN(x,y) (((x)<(y))?(x):(y))
#endif /* MIN */
#include "miniupnpcstrings.h"
#include "miniwget.h"
#include "connecthostport.h"
#include "receivedata.h"
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
/*
* Read a HTTP response from a socket.
* Process Content-Length and Transfer-encoding headers.
* return a pointer to the content buffer, which length is saved
* to the length parameter.
*/
void *
getHTTPResponse(SOCKET s, int * size, int * status_code)
{
char buf[2048];
int n;
int endofheaders = 0;
int chunked = 0;
int content_length = -1;
unsigned int chunksize = 0;
unsigned int bytestocopy = 0;
/* buffers : */
char * header_buf;
unsigned int header_buf_len = 2048;
unsigned int header_buf_used = 0;
char * content_buf;
unsigned int content_buf_len = 2048;
unsigned int content_buf_used = 0;
char chunksize_buf[32];
unsigned int chunksize_buf_index;
#ifdef DEBUG
char * reason_phrase = NULL;
int reason_phrase_len = 0;
#endif
if(status_code) *status_code = -1;
header_buf = malloc(header_buf_len);
if(header_buf == NULL)
{
#ifdef DEBUG
fprintf(stderr, "%s: Memory allocation error\n", "getHTTPResponse");
#endif /* DEBUG */
*size = -1;
return NULL;
}
content_buf = malloc(content_buf_len);
if(content_buf == NULL)
{
free(header_buf);
#ifdef DEBUG
fprintf(stderr, "%s: Memory allocation error\n", "getHTTPResponse");
#endif /* DEBUG */
*size = -1;
return NULL;
}
chunksize_buf[0] = '\0';
chunksize_buf_index = 0;
while((n = receivedata(s, buf, sizeof(buf), 5000, NULL)) > 0)
{
if(endofheaders == 0)
{
int i;
int linestart=0;
int colon=0;
int valuestart=0;
if(header_buf_used + n > header_buf_len) {
char * tmp = realloc(header_buf, header_buf_used + n);
if(tmp == NULL) {
/* memory allocation error */
free(header_buf);
free(content_buf);
*size = -1;
return NULL;
}
header_buf = tmp;
header_buf_len = header_buf_used + n;
}
memcpy(header_buf + header_buf_used, buf, n);
header_buf_used += n;
/* search for CR LF CR LF (end of headers)
* recognize also LF LF */
i = 0;
while(i < ((int)header_buf_used-1) && (endofheaders == 0)) {
if(header_buf[i] == '\r') {
i++;
if(header_buf[i] == '\n') {
i++;
if(i < (int)header_buf_used && header_buf[i] == '\r') {
i++;
if(i < (int)header_buf_used && header_buf[i] == '\n') {
endofheaders = i+1;
}
}
}
} else if(header_buf[i] == '\n') {
i++;
if(header_buf[i] == '\n') {
endofheaders = i+1;
}
}
i++;
}
if(endofheaders == 0)
continue;
/* parse header lines */
for(i = 0; i < endofheaders - 1; i++) {
if(linestart > 0 && colon <= linestart && header_buf[i]==':')
{
colon = i;
while(i < (endofheaders-1)
&& (header_buf[i+1] == ' ' || header_buf[i+1] == '\t'))
i++;
valuestart = i + 1;
}
/* detecting end of line */
else if(header_buf[i]=='\r' || header_buf[i]=='\n')
{
if(linestart == 0 && status_code)
{
/* Status line
* HTTP-Version SP Status-Code SP Reason-Phrase CRLF */
int sp;
for(sp = 0; sp < i - 1; sp++)
if(header_buf[sp] == ' ')
{
if(*status_code < 0)
{
if (header_buf[sp+1] >= '1' && header_buf[sp+1] <= '9')
*status_code = atoi(header_buf + sp + 1);
}
else
{
#ifdef DEBUG
reason_phrase = header_buf + sp + 1;
reason_phrase_len = i - sp - 1;
#endif
break;
}
}
#ifdef DEBUG
printf("HTTP status code = %d, Reason phrase = %.*s\n",
*status_code, reason_phrase_len, reason_phrase);
#endif
}
else if(colon > linestart && valuestart > colon)
{
#ifdef DEBUG
printf("header='%.*s', value='%.*s'\n",
colon-linestart, header_buf+linestart,
i-valuestart, header_buf+valuestart);
#endif
if(0==strncasecmp(header_buf+linestart, "content-length", colon-linestart))
{
content_length = atoi(header_buf+valuestart);
#ifdef DEBUG
printf("Content-Length: %d\n", content_length);
#endif
}
else if(0==strncasecmp(header_buf+linestart, "transfer-encoding", colon-linestart)
&& 0==strncasecmp(header_buf+valuestart, "chunked", 7))
{
#ifdef DEBUG
printf("chunked transfer-encoding!\n");
#endif
chunked = 1;
}
}
while((i < (int)header_buf_used) && (header_buf[i]=='\r' || header_buf[i] == '\n'))
i++;
linestart = i;
colon = linestart;
valuestart = 0;
}
}
/* copy the remaining of the received data back to buf */
n = header_buf_used - endofheaders;
memcpy(buf, header_buf + endofheaders, n);
/* if(headers) */
}
/* if we get there, endofheaders != 0.
* In the other case, there was a continue above */
/* content */
if(chunked)
{
int i = 0;
while(i < n)
{
if(chunksize == 0)
{
/* reading chunk size */
if(chunksize_buf_index == 0) {
/* skipping any leading CR LF */
if(buf[i] == '\r') i++;
if(i<n && buf[i] == '\n') i++;
}
while(i<n && isxdigit(buf[i])
&& chunksize_buf_index < (sizeof(chunksize_buf)-1))
{
chunksize_buf[chunksize_buf_index++] = buf[i];
chunksize_buf[chunksize_buf_index] = '\0';
i++;
}
while(i<n && buf[i] != '\r' && buf[i] != '\n')
i++; /* discarding chunk-extension */
if(i<n && buf[i] == '\r') i++;
if(i<n && buf[i] == '\n') {
unsigned int j;
for(j = 0; j < chunksize_buf_index; j++) {
if(chunksize_buf[j] >= '0'
&& chunksize_buf[j] <= '9')
chunksize = (chunksize << 4) + (chunksize_buf[j] - '0');
else
chunksize = (chunksize << 4) + ((chunksize_buf[j] | 32) - 'a' + 10);
}
chunksize_buf[0] = '\0';
chunksize_buf_index = 0;
i++;
} else {
/* not finished to get chunksize */
continue;
}
#ifdef DEBUG
printf("chunksize = %u (%x)\n", chunksize, chunksize);
#endif
if(chunksize == 0)
{
#ifdef DEBUG
printf("end of HTTP content - %d %d\n", i, n);
/*printf("'%.*s'\n", n-i, buf+i);*/
#endif
goto end_of_stream;
}
}
/* it is guaranteed that (n >= i) */
bytestocopy = (chunksize < (unsigned int)(n - i))?chunksize:(unsigned int)(n - i);
if((content_buf_used + bytestocopy) > content_buf_len)
{
char * tmp;
if((content_length >= 0) && ((unsigned int)content_length >= (content_buf_used + bytestocopy))) {
content_buf_len = content_length;
} else {
content_buf_len = content_buf_used + bytestocopy;
}
tmp = realloc(content_buf, content_buf_len);
if(tmp == NULL) {
/* memory allocation error */
free(content_buf);
free(header_buf);
*size = -1;
return NULL;
}
content_buf = tmp;
}
memcpy(content_buf + content_buf_used, buf + i, bytestocopy);
content_buf_used += bytestocopy;
i += bytestocopy;
chunksize -= bytestocopy;
}
}
else
{
/* not chunked */
if(content_length > 0
&& (content_buf_used + n) > (unsigned int)content_length) {
/* skipping additional bytes */
n = content_length - content_buf_used;
}
if(content_buf_used + n > content_buf_len)
{
char * tmp;
if(content_length >= 0
&& (unsigned int)content_length >= (content_buf_used + n)) {
content_buf_len = content_length;
} else {
content_buf_len = content_buf_used + n;
}
tmp = realloc(content_buf, content_buf_len);
if(tmp == NULL) {
/* memory allocation error */
free(content_buf);
free(header_buf);
*size = -1;
return NULL;
}
content_buf = tmp;
}
memcpy(content_buf + content_buf_used, buf, n);
content_buf_used += n;
}
/* use the Content-Length header value if available */
if(content_length > 0 && content_buf_used >= (unsigned int)content_length)
{
#ifdef DEBUG
printf("End of HTTP content\n");
#endif
break;
}
}
end_of_stream:
free(header_buf);
*size = content_buf_used;
if(content_buf_used == 0)
{
free(content_buf);
content_buf = NULL;
}
return content_buf;
}
/* miniwget3() :
* do all the work.
* Return NULL if something failed. */
static void *
miniwget3(const char * host,
unsigned short port, const char * path,
int * size, char * addr_str, int addr_str_len,
const char * httpversion, unsigned int scope_id,
int * status_code)
{
char buf[2048];
SOCKET s;
int n;
int len;
int sent;
void * content;
*size = 0;
s = connecthostport(host, port, scope_id);
if(ISINVALID(s))
return NULL;
/* get address for caller ! */
if(addr_str)
{
struct sockaddr_storage saddr;
socklen_t saddrlen;
saddrlen = sizeof(saddr);
if(getsockname(s, (struct sockaddr *)&saddr, &saddrlen) < 0)
{
perror("getsockname");
}
else
{
#if defined(__amigaos__) && !defined(__amigaos4__)
/* using INT WINAPI WSAAddressToStringA(LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFOA, LPSTR, LPDWORD);
* But his function make a string with the port : nn.nn.nn.nn:port */
/* if(WSAAddressToStringA((SOCKADDR *)&saddr, sizeof(saddr),
NULL, addr_str, (DWORD *)&addr_str_len))
{
printf("WSAAddressToStringA() failed : %d\n", WSAGetLastError());
}*/
/* the following code is only compatible with ip v4 addresses */
strncpy(addr_str, inet_ntoa(((struct sockaddr_in *)&saddr)->sin_addr), addr_str_len);
#else
#if 0
if(saddr.sa_family == AF_INET6) {
inet_ntop(AF_INET6,
&(((struct sockaddr_in6 *)&saddr)->sin6_addr),
addr_str, addr_str_len);
} else {
inet_ntop(AF_INET,
&(((struct sockaddr_in *)&saddr)->sin_addr),
addr_str, addr_str_len);
}
#endif
/* getnameinfo return ip v6 address with the scope identifier
* such as : 2a01:e35:8b2b:7330::%4281128194 */
n = getnameinfo((const struct sockaddr *)&saddr, saddrlen,
addr_str, addr_str_len,
NULL, 0,
NI_NUMERICHOST | NI_NUMERICSERV);
if(n != 0) {
#ifdef _WIN32
fprintf(stderr, "getnameinfo() failed : %d\n", n);
#else
fprintf(stderr, "getnameinfo() failed : %s\n", gai_strerror(n));
#endif
}
#endif
}
#ifdef DEBUG
printf("address miniwget : %s\n", addr_str);
#endif
}
len = snprintf(buf, sizeof(buf),
"GET %s HTTP/%s\r\n"
"Host: %s:%d\r\n"
"Connection: Close\r\n"
"User-Agent: " OS_STRING ", " UPNP_VERSION_STRING ", MiniUPnPc/" MINIUPNPC_VERSION_STRING "\r\n"
"\r\n",
path, httpversion, host, port);
if ((unsigned int)len >= sizeof(buf))
{
closesocket(s);
return NULL;
}
sent = 0;
/* sending the HTTP request */
while(sent < len)
{
n = send(s, buf+sent, len-sent, 0);
if(n < 0)
{
perror("send");
closesocket(s);
return NULL;
}
else
{
sent += n;
}
}
content = getHTTPResponse(s, size, status_code);
closesocket(s);
return content;
}
/* miniwget2() :
* Call miniwget3(); retry with HTTP/1.1 if 1.0 fails. */
static void *
miniwget2(const char * host,
unsigned short port, const char * path,
int * size, char * addr_str, int addr_str_len,
unsigned int scope_id, int * status_code)
{
char * respbuffer;
#if 1
respbuffer = miniwget3(host, port, path, size,
addr_str, addr_str_len, "1.1",
scope_id, status_code);
#else
respbuffer = miniwget3(host, port, path, size,
addr_str, addr_str_len, "1.0",
scope_id, status_code);
if (*size == 0)
{
#ifdef DEBUG
printf("Retrying with HTTP/1.1\n");
#endif
free(respbuffer);
respbuffer = miniwget3(host, port, path, size,
addr_str, addr_str_len, "1.1",
scope_id, status_code);
}
#endif
return respbuffer;
}
/* parseURL()
* arguments :
* url : source string not modified
* hostname : hostname destination string (size of MAXHOSTNAMELEN+1)
* port : port (destination)
* path : pointer to the path part of the URL
*
* Return values :
* 0 - Failure
* 1 - Success */
int
parseURL(const char * url,
char * hostname, unsigned short * port,
char * * path, unsigned int * scope_id)
{
char * p1, *p2, *p3;
if(!url)
return 0;
p1 = strstr(url, "://");
if(!p1)
return 0;
p1 += 3;
if( (url[0]!='h') || (url[1]!='t')
||(url[2]!='t') || (url[3]!='p'))
return 0;
memset(hostname, 0, MAXHOSTNAMELEN + 1);
if(*p1 == '[')
{
/* IP v6 : http://[2a00:1450:8002::6a]/path/abc */
char * scope;
scope = strchr(p1, '%');
p2 = strchr(p1, ']');
if(p2 && scope && scope < p2 && scope_id) {
/* parse scope */
#ifdef IF_NAMESIZE
char tmp[IF_NAMESIZE];
int l;
scope++;
/* "%25" is just '%' in URL encoding */
if(scope[0] == '2' && scope[1] == '5')
scope += 2; /* skip "25" */
l = p2 - scope;
if(l >= IF_NAMESIZE)
l = IF_NAMESIZE - 1;
memcpy(tmp, scope, l);
tmp[l] = '\0';
*scope_id = if_nametoindex(tmp);
if(*scope_id == 0) {
*scope_id = (unsigned int)strtoul(tmp, NULL, 10);
}
#else
/* under windows, scope is numerical */
char tmp[8];
size_t l;
scope++;
/* "%25" is just '%' in URL encoding */
if(scope[0] == '2' && scope[1] == '5')
scope += 2; /* skip "25" */
l = p2 - scope;
if(l >= sizeof(tmp))
l = sizeof(tmp) - 1;
memcpy(tmp, scope, l);
tmp[l] = '\0';
*scope_id = (unsigned int)strtoul(tmp, NULL, 10);
#endif
}
p3 = strchr(p1, '/');
if(p2 && p3)
{
p2++;
strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p2-p1)));
if(*p2 == ':')
{
*port = 0;
p2++;
while( (*p2 >= '0') && (*p2 <= '9'))
{
*port *= 10;
*port += (unsigned short)(*p2 - '0');
p2++;
}
}
else
{
*port = 80;
}
*path = p3;
return 1;
}
}
p2 = strchr(p1, ':');
p3 = strchr(p1, '/');
if(!p3)
return 0;
if(!p2 || (p2>p3))
{
strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p3-p1)));
*port = 80;
}
else
{
strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p2-p1)));
*port = 0;
p2++;
while( (*p2 >= '0') && (*p2 <= '9'))
{
*port *= 10;
*port += (unsigned short)(*p2 - '0');
p2++;
}
}
*path = p3;
return 1;
}
void *
miniwget(const char * url, int * size,
unsigned int scope_id, int * status_code)
{
unsigned short port;
char * path;
/* protocol://host:port/chemin */
char hostname[MAXHOSTNAMELEN+1];
*size = 0;
if(!parseURL(url, hostname, &port, &path, &scope_id))
return NULL;
#ifdef DEBUG
printf("parsed url : hostname='%s' port=%hu path='%s' scope_id=%u\n",
hostname, port, path, scope_id);
#endif
return miniwget2(hostname, port, path, size, 0, 0, scope_id, status_code);
}
void *
miniwget_getaddr(const char * url, int * size,
char * addr, int addrlen, unsigned int scope_id,
int * status_code)
{
unsigned short port;
char * path;
/* protocol://host:port/path */
char hostname[MAXHOSTNAMELEN+1];
*size = 0;
if(addr)
addr[0] = '\0';
if(!parseURL(url, hostname, &port, &path, &scope_id))
return NULL;
#ifdef DEBUG
printf("parsed url : hostname='%s' port=%hu path='%s' scope_id=%u\n",
hostname, port, path, scope_id);
#endif
return miniwget2(hostname, port, path, size, addr, addrlen, scope_id, status_code);
}
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