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miniupnp/miniupnpc-libevent/miniupnpc-libevent.c

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/* $Id: miniupnpc-libevent.c,v 1.10 2014/11/14 11:37:45 nanard Exp $ */
/* miniupnpc-libevent
* Copyright (c) 2008-2014, Thomas BERNARD <miniupnp@free.fr>
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <stdio.h>
#include <event2/event.h>
#include <event2/buffer.h>
/*#include <event2/bufferevent.h>*/
#include <event2/http.h>
#ifdef WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include <io.h>
#define PRINT_SOCKET_ERROR printf
#define SOCKET_ERROR GetWSALastError()
#define WOULDBLOCK(err) (err == WSAEWOULDBLOCK)
#else
#include <unistd.h>
#include <errno.h>
#define closesocket close
#define PRINT_SOCKET_ERROR perror
#define SOCKET_ERROR errno
#define WOULDBLOCK(err) (err == EAGAIN || err == EWOULDBLOCK)
#endif
#include "miniupnpc-libevent.h"
#include "parsessdpreply.h"
#include "minixml.h"
#include "igd_desc_parse.h"
#include "upnpreplyparse.h"
#ifndef MIN
#define MIN(x,y) (((x)<(y))?(x):(y))
#endif /* MIN */
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif /* MAXHOSTNAMELEN */
#define SSDP_PORT 1900
#define SSDP_MCAST_ADDR "239.255.255.250"
#define XSTR(s) STR(s)
#define STR(s) #s
#ifdef DEBUG
#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
#else
#define debug_printf(...)
#endif
/* stuctures */
struct upnp_args {
const char * elt;
const char * val;
};
/* private functions */
static int upnpc_get_desc(upnpc_t * p, const char * url);
static char * build_url_string(const char * urlbase, const char * root_desc_url, const char * controlurl);
/* data */
static const char * devices_to_search[] = {
"urn:schemas-upnp-org:device:InternetGatewayDevice:1",
"urn:schemas-upnp-org:service:WANIPConnection:1",
"urn:schemas-upnp-org:service:WANPPPConnection:1",
"upnp:rootdevice",
0
};
static void upnpc_conn_close_cb(struct evhttp_connection * conn, void * data)
{
upnpc_t * p = (upnpc_t *)data;
debug_printf("upnpc_get_desc_conn_close_cb %p %p\n", conn, p);
}
/* parse_msearch_reply()
* the last 4 arguments are filled during the parsing :
* - location/locationsize : "location:" field of the SSDP reply packet
* - st/stsize : "st:" field of the SSDP reply packet.
* The strings are NOT null terminated */
static void
parse_msearch_reply(const char * reply, int size,
const char * * location, int * locationsize,
const char * * st, int * stsize)
{
int a, b, i;
i = 0; /* current character index */
a = i; /* start of the line */
b = 0; /* end of the "header" (position of the colon) */
while(i<size) {
switch(reply[i]) {
case ':':
if(b==0) {
b = i; /* end of the "header" */
}
break;
case '\x0a':
case '\x0d':
if(b!=0) {
/* skip the colon and white spaces */
do { b++; } while(reply[b]==' ' && b<size);
if(0==strncasecmp(reply+a, "location", 8)) {
*location = reply+b;
*locationsize = i-b;
} else if(0==strncasecmp(reply+a, "st", 2)) {
*st = reply+b;
*stsize = i-b;
}
b = 0;
}
a = i+1;
break;
default:
break;
}
i++;
}
}
static void upnpc_send_ssdp_msearch(evutil_socket_t s, short events, upnpc_t * p)
{
/* envoyer les packets de M-SEARCH discovery sur le socket ssdp */
int n;
char bufr[1024];
struct sockaddr_in addr;
unsigned int mx = 2;
static const char MSearchMsgFmt[] =
"M-SEARCH * HTTP/1.1\r\n"
"HOST: " SSDP_MCAST_ADDR ":" XSTR(SSDP_PORT) "\r\n"
"ST: %s\r\n"
"MAN: \"ssdp:discover\"\r\n"
"MX: %u\r\n"
"\r\n";
(void)p;
(void)events;
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(SSDP_PORT);
addr.sin_addr.s_addr = inet_addr(SSDP_MCAST_ADDR);
n = snprintf(bufr, sizeof(bufr),
MSearchMsgFmt, devices_to_search[0], mx);
debug_printf("upnpc_send_ssdp_msearch: %s", bufr);
n = sendto(s, bufr, n, 0,
(struct sockaddr *)&addr, sizeof(struct sockaddr_in));
if (n < 0) {
PRINT_SOCKET_ERROR("sendto");
}
}
static int upnpc_set_root_desc_location(upnpc_t * p, const char * location, int locationsize)
{
char * tmp;
tmp = realloc(p->root_desc_location, locationsize + 1);
if(tmp == 0) {
return -1;
}
memcpy(tmp, location, locationsize);
tmp[locationsize] = '\0';
p->root_desc_location = tmp;
return 0;
}
static void upnpc_receive_and_parse_ssdp(evutil_socket_t s, short events, upnpc_t * p)
{
char bufr[2048];
ssize_t len;
if(events == EV_TIMEOUT) {
/* nothing received ... */
debug_printf("upnpc_receive_and_parse_ssdp() TIMEOUT\n");
return;
}
len = recv(s, bufr, sizeof(bufr), 0);
debug_printf("input %d bytes\n", (int)len);
if(len < 0) {
PRINT_SOCKET_ERROR("recv");
} else if(len == 0) {
debug_printf("SSDP socket closed ?\n");
} else {
const char * location = NULL;
int locationsize;
const char * st = NULL;
int stsize;
debug_printf("%.*s", (int)len, bufr);
parse_msearch_reply(bufr, len, &location, &locationsize, &st, &stsize);
debug_printf("location = '%.*s'\n", locationsize, location);
debug_printf("st = '%.*s'\n", stsize, st);
if(location != NULL) {
if(upnpc_set_root_desc_location(p, location, locationsize) < 0) {
return;
}
upnpc_get_desc(p, p->root_desc_location);
} else {
/* or do nothing ? */
}
}
}
static 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 /* IF_NAMESIZE */
/* under windows, scope is numerical */
char tmp[8];
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 >= (int)sizeof(tmp))
l = sizeof(tmp) - 1;
memcpy(tmp, scope, l);
tmp[l] = '\0';
*scope_id = (unsigned int)strtoul(tmp, NULL, 10);
#endif /* IF_NAMESIZE */
}
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;
}
static void upnpc_desc_received(struct evhttp_request * req, void * pvoid)
{
size_t len;
unsigned char * data;
struct evbuffer * input_buffer;
struct IGDdatas igd;
struct xmlparser parser;
upnpc_t * p = (upnpc_t *)pvoid;
input_buffer = evhttp_request_get_input_buffer(req);
len = evbuffer_get_length(input_buffer);
data = evbuffer_pullup(input_buffer, len);
debug_printf("upnpc_desc_received %d (%d bytes)\n", evhttp_request_get_response_code(req), (int)len);
debug_printf("%.*s\n", (int)len, (char *)data);
if(data == NULL)
return;
memset(&igd, 0, sizeof(struct IGDdatas));
memset(&parser, 0, sizeof(struct xmlparser));
parser.xmlstart = (char *)data;
parser.xmlsize = len;
parser.data = &igd;
parser.starteltfunc = IGDstartelt;
parser.endeltfunc = IGDendelt;
parser.datafunc = IGDdata;
parsexml(&parser);
#ifdef DEBUG
printIGD(&igd);
#endif /* DEBUG */
p->control_conn_url = build_url_string(igd.urlbase, p->root_desc_location, igd.first.controlurl);
p->control_cif_url = build_url_string(igd.urlbase, p->root_desc_location, igd.CIF.controlurl);
debug_printf("control_conn_url='%s'\n", p->control_conn_url);
debug_printf("control_cif_url='%s'\n", p->control_cif_url);
p->ready_cb(evhttp_request_get_response_code(req), p->cb_data);
}
static void upnpc_soap_response(struct evhttp_request * req, void * pvoid)
{
size_t len;
unsigned char * data;
struct evbuffer * input_buffer;
upnpc_t * p = (upnpc_t *)pvoid;
input_buffer = evhttp_request_get_input_buffer(req);
len = evbuffer_get_length(input_buffer);
data = evbuffer_pullup(input_buffer, len);
debug_printf("upnpc_soap_response %d (%d bytes)\n", evhttp_request_get_response_code(req), (int)len);
debug_printf("%.*s\n", (int)len, (char *)data);
if(data == NULL)
return;
ClearNameValueList(&p->soap_response_data);
ParseNameValue((char *)data, (int)len,
&p->soap_response_data);
p->soap_cb(evhttp_request_get_response_code(req), p->cb_data);
}
static int upnpc_get_desc(upnpc_t * p, const char * url)
{
char hostname[MAXHOSTNAMELEN+1];
unsigned short port;
char * path;
unsigned int scope_id;
struct evhttp_request * req;
struct evkeyvalq * headers;
if(p->root_desc_location == 0) {
return -1;
}
if(!parseURL(url/*p->root_desc_location*/, hostname, &port,
&path, &scope_id)) {
return -1;
}
if(p->desc_conn == NULL) {
p->desc_conn = evhttp_connection_base_new(p->base, NULL, hostname, port);
}
evhttp_connection_set_closecb(p->desc_conn, upnpc_conn_close_cb, p);
/*evhttp_connection_set_timeout(p->desc_conn, 600);*/
req = evhttp_request_new(upnpc_desc_received/*callback*/, p);
headers = evhttp_request_get_output_headers(req);
evhttp_add_header(headers, "Host", hostname);
evhttp_add_header(headers, "Connection", "close");
/*evhttp_add_header(headers, "User-Agent", "***");*/
evhttp_make_request(p->desc_conn, req, EVHTTP_REQ_GET, path);
return 0;
}
static char * build_url_string(const char * urlbase, const char * root_desc_url, const char * controlurl)
{
int l, n;
char * s;
const char * base;
char * p;
/* if controlurl is an absolute url, return it */
if(0 == memcmp("http://", controlurl, 7))
return strdup(controlurl);
base = (urlbase[0] == '\0') ? root_desc_url : urlbase;
n = strlen(base);
if(n > 7) {
p = strchr(base + 7, '/');
if(p)
n = p - base;
}
l = n + strlen(controlurl) + 1;
if(controlurl[0] != '/')
l++;
s = malloc(l);
if(s == NULL) return NULL;
memcpy(s, base, n);
if(controlurl[0] != '/')
s[n++] = '/';
memcpy(s + n, controlurl, l - n);
return s;
}
#define SOAPPREFIX "s"
#define SERVICEPREFIX "u"
#define SERVICEPREFIX2 'u'
static int upnpc_send_soap_request(upnpc_t * p, const char * url,
const char * service,
const char * method,
const struct upnp_args * args, int arg_count)
{
char action[128];
char * body;
const char fmt_soap[] =
"<?xml version=\"1.0\"?>\r\n"
"<" SOAPPREFIX ":Envelope "
"xmlns:" SOAPPREFIX "=\"http://schemas.xmlsoap.org/soap/envelope/\" "
SOAPPREFIX ":encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"
"<" SOAPPREFIX ":Body>"
"<" SERVICEPREFIX ":%s xmlns:" SERVICEPREFIX "=\"%s\">"
"%s"
"</" SERVICEPREFIX ":%s>"
"</" SOAPPREFIX ":Body></" SOAPPREFIX ":Envelope>"
"\r\n";
int body_len;
char hostname[MAXHOSTNAMELEN+1];
unsigned short port;
char * path;
unsigned int scope_id;
char portstr[8];
char * args_xml = NULL;
struct evhttp_request * req;
struct evkeyvalq * headers;
struct evbuffer * buffer;
if(arg_count > 0) {
int i;
size_t l, n;
for(i = 0, l = 0; i < arg_count; i++) {
/* <ELT>VAL</ELT> */
l += strlen(args[i].elt) * 2 + strlen(args[i].val) + 5;
}
args_xml = malloc(++l);
if(args_xml == NULL) {
return -1;
}
for(i = 0, n = 0; i < arg_count && n < l; i++) {
/* <ELT>VAL</ELT> */
n += snprintf(args_xml + n, l - n, "<%s>%s</%s>",
args[i].elt, args[i].val, args[i].elt);
}
}
body_len = snprintf(NULL, 0, fmt_soap, method, service, args_xml?args_xml:"", method);
body = malloc(body_len + 1);
if(body == NULL) {
return -1;
}
if(snprintf(body, body_len + 1, fmt_soap, method, service, args_xml?args_xml:"", method) != body_len) {
debug_printf("snprintf() returned strange value...\n");
}
free(args_xml);
args_xml = NULL;
if(!parseURL(url, hostname, &port, &path, &scope_id)) {
return -1;
}
if(port != 80)
snprintf(portstr, sizeof(portstr), ":%hu", port);
else
portstr[0] = '\0';
snprintf(action, sizeof(action), "%s#%s", service, method);
if(p->soap_conn == NULL) {
p->soap_conn = evhttp_connection_base_new(p->base, NULL, hostname, port);
}
req = evhttp_request_new(upnpc_soap_response, p);
headers = evhttp_request_get_output_headers(req);
buffer = evhttp_request_get_output_buffer(req);
evhttp_add_header(headers, "Host", hostname);
evhttp_add_header(headers, "SOAPAction", action);
evhttp_add_header(headers, "Content-Type", "text/xml");
/*evhttp_add_header(headers, "User-Agent", "***");*/
/*evhttp_add_header(headers, "Cache-Control", "no-cache");*/
/*evhttp_add_header(headers, "Pragma", "no-cache");*/
evbuffer_add(buffer, body, body_len);
evhttp_make_request(p->soap_conn, req, EVHTTP_REQ_POST, path);
free(body);
return 0;
}
/* public functions */
int upnpc_init(upnpc_t * p, struct event_base * base, const char * multicastif,
upnpc_callback_fn ready_cb, upnpc_callback_fn soap_cb, void * cb_data)
{
int opt = 1;
struct sockaddr_in addr;
struct timeval timeout;
if(p == NULL || base == NULL)
return UPNPC_ERR_INVALID_ARGS;
memset(p, 0, sizeof(upnpc_t)); /* clean everything */
p->base = base;
p->ready_cb = ready_cb;
p->soap_cb = soap_cb;
p->cb_data = cb_data;
/* open the socket for SSDP */
p->ssdp_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(p->ssdp_socket < 0) {
return UPNPC_ERR_SOCKET_FAILED;
}
/* set REUSEADDR */
#ifdef WIN32
if(setsockopt(p->ssdp_socket, SOL_SOCKET, SO_REUSEADDR, (const char *)&opt, sizeof(opt)) < 0) {
#else /* WIN32 */
if(setsockopt(p->ssdp_socket, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) {
#endif /* WIN32 */
/* non fatal error ! */
}
if(evutil_make_socket_nonblocking(p->ssdp_socket) < 0) {
debug_printf("evutil_make_socket_nonblocking FAILED\n");
}
/* receive address */
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
/*addr.sin_port = htons(SSDP_PORT);*/
if(multicastif) {
struct in_addr mc_if;
mc_if.s_addr = inet_addr(multicastif);
addr.sin_addr.s_addr = mc_if.s_addr;
if(setsockopt(p->ssdp_socket, IPPROTO_IP, IP_MULTICAST_IF, (const char *)&mc_if, sizeof(mc_if)) < 0) {
PRINT_SOCKET_ERROR("setsockopt");
/* non fatal error ! */
}
}
/* bind the socket to the ssdp address in order to receive responses */
if(bind(p->ssdp_socket, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) != 0) {
close(p->ssdp_socket);
return UPNPC_ERR_BIND_FAILED;
}
/* event on SSDP */
p->ev_ssdp_recv = event_new(p->base, p->ssdp_socket,
EV_READ|EV_PERSIST,
(event_callback_fn)upnpc_receive_and_parse_ssdp, p);
timeout.tv_sec = 3;
timeout.tv_usec = 0;
if(event_add(p->ev_ssdp_recv, &timeout)) {
debug_printf("event_add FAILED\n");
}
p->ev_ssdp_writable = event_new(p->base, p->ssdp_socket,
EV_WRITE,
(event_callback_fn)upnpc_send_ssdp_msearch, p);
if(event_add(p->ev_ssdp_writable, NULL)) {
debug_printf("event_add FAILED\n");
}
return UPNPC_OK;
}
int upnpc_finalize(upnpc_t * p)
{
if(!p) return UPNPC_ERR_INVALID_ARGS;
free(p->root_desc_location);
p->root_desc_location = NULL;
free(p->control_cif_url);
p->control_cif_url = NULL;
free(p->control_conn_url);
p->control_conn_url = NULL;
if(p->ssdp_socket >= 0) {
close(p->ssdp_socket);
p->ssdp_socket = -1;
}
if(p->ev_ssdp_recv) {
event_free(p->ev_ssdp_recv);
p->ev_ssdp_recv = NULL;
}
if(p->ev_ssdp_writable) {
event_free(p->ev_ssdp_writable);
p->ev_ssdp_writable = NULL;
}
if(p->desc_conn) {
evhttp_connection_free(p->desc_conn);
p->desc_conn = NULL;
}
if(p->soap_conn) {
evhttp_connection_free(p->soap_conn);
p->soap_conn = NULL;
}
ClearNameValueList(&p->soap_response_data);
return UPNPC_OK;
}
int upnpc_get_external_ip_address(upnpc_t * p)
{
return upnpc_send_soap_request(p, p->control_conn_url,
"urn:schemas-upnp-org:service:WANIPConnection:1",
"GetExternalIPAddress", NULL, 0);
}
int upnpc_get_link_layer_max_rate(upnpc_t * p)
{
return upnpc_send_soap_request(p, p->control_cif_url,
"urn:schemas-upnp-org:service:WANCommonInterfaceConfig:1",
"GetCommonLinkProperties", NULL, 0);
}
int upnpc_delete_port_mapping(upnpc_t * p,
const char * remote_host, unsigned short ext_port,
const char * proto)
{
struct upnp_args args[3];
char ext_port_str[8];
if(proto == NULL || ext_port == 0)
return UPNPC_ERR_INVALID_ARGS;
snprintf(ext_port_str, sizeof(ext_port_str), "%hu", ext_port);
args[0].elt = "NewRemoteHost";
args[0].val = remote_host?remote_host:"";
args[1].elt = "NewExternalPort";
args[1].val = ext_port_str;
args[2].elt = "NewProtocol";
args[2].val = proto;
return upnpc_send_soap_request(p, p->control_conn_url,
"urn:schemas-upnp-org:service:WANIPConnection:1",
"DeletePortMapping",
args, 3);
}
int upnpc_add_port_mapping(upnpc_t * p,
const char * remote_host, unsigned short ext_port,
unsigned short int_port, const char * int_client,
const char * proto, const char * description,
unsigned int lease_duration)
{
struct upnp_args args[8];
char lease_duration_str[16];
char int_port_str[8];
char ext_port_str[8];
if(int_client == NULL || int_port == 0 || ext_port == 0 || proto == NULL)
return UPNPC_ERR_INVALID_ARGS;
snprintf(lease_duration_str, sizeof(lease_duration_str), "%u", lease_duration);
snprintf(int_port_str, sizeof(int_port_str), "%hu", int_port);
snprintf(ext_port_str, sizeof(ext_port_str), "%hu", ext_port);
args[0].elt = "NewRemoteHost";
args[0].val = remote_host?remote_host:"";
args[1].elt = "NewExternalPort";
args[1].val = ext_port_str;
args[2].elt = "NewProtocol";
args[2].val = proto;
args[3].elt = "NewInternalPort";
args[3].val = int_port_str;
args[4].elt = "NewInternalClient";
args[4].val = int_client;
args[5].elt = "NewEnabled";
args[5].val = "1";
args[6].elt = "NewPortMappingDescription";
args[6].val = description?description:"miniupnpc-libevent";
args[7].elt = "NewLeaseDuration";
args[7].val = lease_duration_str;
return upnpc_send_soap_request(p, p->control_conn_url,
"urn:schemas-upnp-org:service:WANIPConnection:1",
"AddPortMapping",
args, 8);
}
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