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/***************************************************************************\
* *
* BitlBee - An IRC to IM gateway *
* Utility functions for file transfer *
* *
* Copyright 2008 Uli Meis <a.sporto+bee@gmail.com> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
* *
\***************************************************************************/
#define BITLBEE_CORE
#include "bitlbee.h"
#include <poll.h>
#include <netinet/tcp.h>
#include "lib/ftutil.h"
#define ASSERTSOCKOP(op, msg) \
if ((op) == -1) { \
g_snprintf(errmsg, sizeof(errmsg), msg ": %s", strerror(errno)); \
return -1; }
/*
* Creates a listening socket and returns it in saddr_ptr.
*/
int ft_listen(struct sockaddr_storage *saddr_ptr, char *host, char *port, int copy_fd, int for_bitlbee_client,
char **errptr)
{
int fd, gret, saddrlen;
struct addrinfo hints, *rp;
socklen_t ssize = sizeof(struct sockaddr_storage);
struct sockaddr_storage saddrs, *saddr = &saddrs;
static char errmsg[1024];
char *ftlisten = global.conf->ft_listen;
if (errptr) {
*errptr = errmsg;
}
strcpy(port, "0");
/* Format is <IP-A>[:<Port-A>];<IP-B>[:<Port-B>] where
* A is for connections with the bitlbee client (DCC)
* and B is for connections with IM peers.
*/
if (ftlisten) {
char *scolon = strchr(ftlisten, ';');
char *colon;
if (scolon) {
if (for_bitlbee_client) {
*scolon = '\0';
strncpy(host, ftlisten, HOST_NAME_MAX);
*scolon = ';';
} else {
strncpy(host, scolon + 1, HOST_NAME_MAX);
}
} else {
strncpy(host, ftlisten, HOST_NAME_MAX);
}
if ((colon = strchr(host, ':'))) {
*colon = '\0';
strncpy(port, colon + 1, 5);
}
} else if (copy_fd >= 0 && getsockname(copy_fd, (struct sockaddr*) &saddrs, &ssize) == 0 &&
(saddrs.ss_family == AF_INET || saddrs.ss_family == AF_INET6) &&
getnameinfo((struct sockaddr*) &saddrs, ssize, host, HOST_NAME_MAX,
NULL, 0, NI_NUMERICHOST) == 0) {
/* We just took our local address on copy_fd, which is likely to be a
sensible address from which we can do a file transfer now - the
most sensible we can get easily. */
} else {
ASSERTSOCKOP(gethostname(host, HOST_NAME_MAX + 1), "gethostname()");
}
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICSERV;
if ((gret = getaddrinfo(host, port, &hints, &rp)) != 0) {
sprintf(errmsg, "getaddrinfo() failed: %s", gai_strerror(gret));
return -1;
}
saddrlen = rp->ai_addrlen;
memcpy(saddr, rp->ai_addr, saddrlen);
freeaddrinfo(rp);
ASSERTSOCKOP(fd = socket(saddr->ss_family, SOCK_STREAM, 0), "Opening socket");
ASSERTSOCKOP(bind(fd, ( struct sockaddr *) saddr, saddrlen), "Binding socket");
ASSERTSOCKOP(listen(fd, 1), "Making socket listen");
if (!inet_ntop(saddr->ss_family, saddr->ss_family == AF_INET ?
( void * ) &(( struct sockaddr_in * ) saddr)->sin_addr.s_addr :
( void * ) &(( struct sockaddr_in6 * ) saddr)->sin6_addr.s6_addr,
host, HOST_NAME_MAX)) {
strcpy(errmsg, "inet_ntop failed on listening socket");
return -1;
}
ssize = sizeof(struct sockaddr_storage);
ASSERTSOCKOP(getsockname(fd, ( struct sockaddr *) saddr, &ssize), "Getting socket name");
if (saddr->ss_family == AF_INET) {
g_snprintf(port, 6, "%d", ntohs(((struct sockaddr_in *) saddr)->sin_port));
} else {
g_snprintf(port, 6, "%d", ntohs(((struct sockaddr_in6 *) saddr)->sin6_port));
}
if (saddr_ptr) {
memcpy(saddr_ptr, saddr, saddrlen);
}
/* I hate static-length strings.. */
host[HOST_NAME_MAX - 1] = '\0';
port[5] = '\0';
return fd;
}
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