static int connect_remote(CLI *c) { /* connect to remote host */
SOCKADDR_UNION bind_addr, addr;
SOCKADDR_LIST resolved_list, *address_list;
int error;
int s; /* destination socket */
u16 i;
/* setup address_list */
if(c->opt->option.delayed_lookup) {
resolved_list.num=0;
if(!name2addrlist(&resolved_list,
c->opt->remote_address, DEFAULT_LOOPBACK))
return -1; /* no host resolved */
address_list=&resolved_list;
} else /* use pre-resolved addresses */
address_list=&c->opt->remote_addr;
/* try to connect each host from the list */
for(i=0; i<address_list->num; i++) {
memcpy(&addr, address_list->addr + address_list->cur,
sizeof(SOCKADDR_UNION));
address_list->cur=(address_list->cur+1)%address_list->num;
/* race condition is possible, but harmless in this case */
if((s=socket(addr.sa.sa_family, SOCK_STREAM, 0))<0) {
sockerror("remote socket");
return -1;
}
if(alloc_fd(s))
return -1;
if(c->bind_addr.num) { /* explicit local bind or transparent proxy */
memcpy(&bind_addr, &c->bind_addr.addr[0], sizeof(SOCKADDR_UNION));
if(bind(s, &bind_addr.sa, addr_len(bind_addr))<0) {
sockerror("bind transparent");
closesocket(s);
return -1;
}
}
/* try to connect for the 1st time */
s_ntop(c->connecting_address, &addr);
s_log(LOG_DEBUG, "%s connecting %s",
c->opt->servname, c->connecting_address);
if(!connect(s, &addr.sa, addr_len(addr)))
return s; /* no error -> success (should not be possible) */
error=get_last_socket_error();
if(error!=EINPROGRESS && error!=EWOULDBLOCK) {
s_log(LOG_ERR, "remote connect (%s): %s (%d)",
c->connecting_address, my_strerror(error), error);
closesocket(s);
continue; /* next IP */
}
if(!connect_wait(c, s, c->opt->timeout_connect))
return s; /* success! */
closesocket(s); /* error -> next IP */
}
return -1;
}
static int auth_user(CLI *c) {
struct servent *s_ent; /* structure for getservbyname */
SOCKADDR_UNION ident; /* IDENT socket name */
int fd; /* IDENT socket descriptor */
char name[STRLEN];
int retval;
int error;
if(!c->opt->username)
return 0; /* -u option not specified */
if((fd=socket(c->peer_addr.addr[0].sa.sa_family, SOCK_STREAM, 0))<0) {
sockerror("socket (auth_user)");
return -1;
}
if(alloc_fd(fd))
return -1;
memcpy(&ident, &c->peer_addr.addr[0], sizeof(SOCKADDR_UNION));
s_ent=getservbyname("auth", "tcp");
if(s_ent) {
ident.in.sin_port=s_ent->s_port;
} else {
s_log(LOG_WARNING, "Unknown service 'auth': using default 113");
ident.in.sin_port=htons(113);
}
if(connect(fd, &ident.sa, addr_len(ident))) {
error=get_last_socket_error();
if(error!=EINPROGRESS && error!=EWOULDBLOCK) {
sockerror("ident connect (auth_user)");
closesocket(fd);
return -1;
}
if(connect_wait(c, fd, c->opt->timeout_connect)) { /* error */
closesocket(fd);
return -1;
}
}
s_log(LOG_DEBUG, "IDENT server connected");
if(fdprintf(c, fd, "%u , %u",
ntohs(c->peer_addr.addr[0].in.sin_port),
ntohs(c->opt->local_addr.addr[0].in.sin_port))<0) {
sockerror("fdprintf (auth_user)");
closesocket(fd);
return -1;
}
if(fdscanf(c, fd, "%*[^:]: USERID :%*[^:]:%s", name)!=1) {
s_log(LOG_ERR, "Incorrect data from IDENT server");
closesocket(fd);
return -1;
}
closesocket(fd);
retval=strcmp(name, c->opt->username) ? -1 : 0;
safestring(name);
s_log(LOG_INFO, "IDENT resolved remote user to %s", name);
return retval;
}
void connect_target(msyncdata *md)
{
struct timeval tv;
md->s = connect_socket(md->target);
if(md->s == -1){
fprintf(stderr, "can't connect %s\n", md->target);
exit(1);
}
tv.tv_sec = 5;
tv.tv_usec = 0;
setsockopt(md->s, SOL_SOCKET, SO_RCVTIMEO, (void *)&tv, sizeof(tv));
if(connect_wait(md)){
close(md->s);
exit(1);
}
}
