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/*
** id_open.c Establish/initiate a connection to an IDENT server
**
** Author: Peter Eriksson <pen@lysator.liu.se>
** Fixes: Pdr Emanuelsson <pell@lysator.liu.se>
*/
#include <stdio.h>
#include <errno.h>
#if defined(ISC)
#include <net/errno.h>
#endif /* #if defined(ISC) */
#include <memory.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/file.h>
#if defined(ISC)
#include <fcntl.h>
#endif /* #if defined(ISC) */
#include <netinet/in.h>
#include <arpa/inet.h>
/* SOLARIS */
#if defined(__svr4__) || defined (SOLARIS) || defined(SCO)
#include <fcntl.h>
#endif
/* LINUX */
#ifdef LINUX
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#ifdef FNDLEAY /*watch out for a ?typo? in fcntl.h !? */
#define FNDELAY FNDLEAY
#endif
#endif /* LINUX */
/* The following struct linger declaration seemed to be
* missing from older versions of LINUX but is present in
* current. If you need it, you must uncomment NEED_STRUCT_LINGER
* in the top level Makefile.
*/
#ifdef NEED_STRUCT_LINGER
/*
* Structure used for manipulating linger option.
*/
struct linger {
int l_onoff; /* option on/off */
int l_linger; /* linger time */
};
#endif /* #ifdef NEED_STRUCT_LINGER */
#include "ident.h"
/*extern void *malloc __P((int size));*/
ident_t *id_open
#ifdef __STDC__
(struct in_addr *laddr, struct in_addr *faddr, struct timeval *timeout)
#else
(laddr, faddr, timeout)
struct in_addr *laddr;
struct in_addr *faddr;
struct timeval *timeout;
#endif
{
ident_t *id;
int res, tmperrno;
struct sockaddr_in sin_laddr, sin_faddr;
fd_set rs, ws, es;
#if !defined(SO_DONTLINGER) || defined(SOLARIS)
struct linger linger;
#endif
#if defined(sgi) || defined (SOLARIS) || defined(__bsdi__)
int on = 1;
#endif
if ((id = (ident_t *) malloc(sizeof(*id))) == 0)
return 0;
if ((id->fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
free(id);
return 0;
}
if (timeout)
{
if ((res = fcntl(id->fd, F_GETFL, 0)) < 0)
goto ERROR;
if (fcntl(id->fd, F_SETFL, res | FNDELAY) < 0)
goto ERROR;
}
#if defined(SO_DONTLINGER) && !defined(SOLARIS)
if (setsockopt(id->fd, SOL_SOCKET, SO_DONTLINGER, 0, 0) < 0)
goto ERROR;
#else
linger.l_onoff = 0;
linger.l_linger = 0;
if (setsockopt(id->fd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger)) < 0)
goto ERROR;
#endif
#if defined(sgi) || defined(SOLARIS) || defined(__bsdi__)
if (setsockopt(id->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
sizeof(on)) < 0)
#else
# if !defined(LINUX)
if (setsockopt(id->fd, SOL_SOCKET, SO_REUSEADDR, 0, 0) < 0)
# endif
#endif
goto ERROR;
id->buf[0] = '\0';
memset(&sin_laddr, 0, sizeof(sin_laddr));
sin_laddr.sin_family = AF_INET;
sin_laddr.sin_addr = *laddr;
sin_laddr.sin_port = 0;
if (bind(id->fd, (struct sockaddr *)&sin_laddr, sizeof(sin_laddr)) < 0)
goto ERROR;
memset(&sin_faddr, 0, sizeof(sin_faddr));
sin_faddr.sin_family = AF_INET;
sin_faddr.sin_addr = *faddr;
sin_faddr.sin_port = htons(IDPORT);
res = connect(id->fd, (struct sockaddr *)&sin_faddr, sizeof(sin_faddr));
if (res < 0 && errno != EINPROGRESS)
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)
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 0;
}
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