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/*
** id_open.c Establish/initiate a connection to an IDENT server
**
** Author: Peter Eriksson <pen@lysator.liu.se>
** Fixes: Pr Emanuelsson <pell@lysator.liu.se>
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#if HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#if HAVE_SYS_SELECT_H
# include <sys/select.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# endif
#endif
#define IN_LIBIDENT_SRC
#include "ident.h"
#if HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
ident_t *id_open (const struct in_addr *laddr, const struct in_addr *faddr,
struct timeval *timeout)
{
struct sockaddr_in lsockaddr, fsockaddr;
memset(&lsockaddr, 0, sizeof(lsockaddr));
lsockaddr.sin_family = AF_INET;
#if HAVE_SA_LEN
lsockaddr.sin_len = sizeof(lsockaddr);
#endif
lsockaddr.sin_addr.s_addr = laddr->s_addr;
memcpy(&fsockaddr, &lsockaddr, sizeof(fsockaddr));
fsockaddr.sin_addr.s_addr = faddr->s_addr;
return id_open_addr((struct sockaddr *)&lsockaddr,
(struct sockaddr *)&fsockaddr, timeout);
}
ident_t *id_open_addr (const struct sockaddr *laddr,
const struct sockaddr *faddr, struct timeval *timeout)
{
ident_t *id;
int res, tmperrno, pf;
struct sockaddr_storage ss_laddr, ss_faddr;
fd_set rs, ws, es;
const int on = 1;
struct linger linger;
if ((id = (ident_t *) malloc(sizeof(*id))) == NULL)
return NULL;
switch (faddr->sa_family)
{
case AF_INET:
pf = PF_INET;
break;
#ifdef AF_INET6
case AF_INET6:
pf = PF_INET6;
break;
#endif
default:
free(id);
return NULL;
}
if ((id->fd = socket(pf, SOCK_STREAM, 0)) < 0)
{
free(id);
return NULL;
}
if (timeout)
{
if (((res = fcntl(id->fd, F_GETFL, 0)) < 0)
|| (fcntl(id->fd, F_SETFL, res | FNDELAY) < 0))
goto ERROR;
}
/* We silently ignore errors if we can't change LINGER */
/* New style setsockopt() */
linger.l_onoff = 0;
linger.l_linger = 0;
setsockopt(id->fd, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
setsockopt(id->fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
id->buf[0] = '\0';
memcpy(&ss_laddr, laddr, sizeof(ss_laddr));
switch (ss_laddr.ss_family)
{
case AF_INET:
((struct sockaddr_in *)&ss_laddr)->sin_port = 0;
break;
#ifdef AF_INET6
case AF_INET6:
((struct sockaddr_in6 *)&ss_laddr)->sin6_port = 0;
break;
#endif
}
#if HAVE_SA_LEN
if (bind(id->fd, (struct sockaddr *) &ss_laddr, ss_laddr.ss_len) < 0)
#else
if (bind(id->fd, (struct sockaddr *) &ss_laddr, sizeof(ss_laddr)) < 0)
#endif
{
#ifdef DEBUG
perror("libident: bind");
#endif
goto ERROR;
}
memcpy(&ss_faddr, faddr, sizeof(ss_faddr));
switch (ss_faddr.ss_family)
{
case AF_INET:
((struct sockaddr_in *)&ss_faddr)->sin_port = htons(IPPORT_IDENT);
break;
#ifdef AF_INET6
case AF_INET6:
((struct sockaddr_in6 *)&ss_faddr)->sin6_port = htons(IPPORT_IDENT);
break;
#endif
}
errno = 0;
#if HAVE_SA_LEN
res = connect(id->fd, (struct sockaddr *)&ss_faddr, ss_faddr.ss_len);
#else
res = connect(id->fd, (struct sockaddr *)&ss_faddr, sizeof(ss_faddr));
#endif
if (res < 0 && errno != EINPROGRESS)
{
#ifdef DEBUG
perror("libident: connect");
#endif
goto ERROR;
}
if (timeout)
{
FD_ZERO(&rs);
FD_ZERO(&ws);
FD_ZERO(&es);
FD_SET(id->fd, &rs);
FD_SET(id->fd, &ws);
FD_SET(id->fd, &es);
if ((res = select(FD_SETSIZE, &rs, &ws, &es, timeout)) < 0)
{
#ifdef DEBUG
perror("libident: select");
#endif
goto ERROR;
}
if (res == 0)
{
errno = ETIMEDOUT;
goto ERROR;
}
if (FD_ISSET(id->fd, &es))
goto ERROR;
if (!FD_ISSET(id->fd, &rs) && !FD_ISSET(id->fd, &ws))
goto ERROR;
}
return id;
ERROR:
tmperrno = errno; /* Save, so close() won't erase it */
close(id->fd);
free(id);
errno = tmperrno;
return NULL;
}
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