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/* rconnect - connect to a service on a remote host
* vix 13sep91 [written - again, dammit]
*/
#ifndef LINT
static char RCSid[] = "$Id: connutil.c,v 1.9 2001/03/24 21:14:25 vixie Exp $";
#endif
/* Copyright (c) 1996 by Internet Software Consortium.
*
* Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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.
*/
#ifdef WANT_TCPIP
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <netdb.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include "rtty.h"
#include "misc.h"
extern int h_errno;
extern char *ProgName;
/* assume ip/tcp for now */
static jmp_buf jmpalrm;
static void sigalrm(int);
static
int doconnect(struct sockaddr_in *n, int ns, int to) {
int sock, ok, save;
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
return -1;
}
if (to) {
if (!setjmp(jmpalrm)) {
signal(SIGALRM, sigalrm);
alarm(to);
} else {
errno = ETIMEDOUT;
goto finito;
}
}
ok = (connect(sock, (struct sockaddr *)n, ns) >= 0);
save = errno;
finito:
if (to) {
alarm(0);
signal(SIGALRM, SIG_DFL);
}
if (!ok) {
close(sock);
errno = save;
return -1;
}
errno = save;
return sock;
}
int
rconnect(const char *host, const char *service,
FILE *verbose, FILE *errors, int timeout)
{
u_int32_t **hp;
struct hostent *h;
struct sockaddr_in n;
int port, sock, done;
if (!(port = htons(atoi(service)))) {
struct servent *s = getservbyname(service, "tcp");
if (!s) {
if (errors) {
fprintf(errors,
"%s: unknown service\n", service);
}
errno = ENOPROTOOPT;
return -1;
}
port = s->s_port;
}
n.sin_family = AF_INET;
#ifndef NO_SOCKADDR_LEN
n.sin_len = sizeof(struct sockaddr_in);
#endif
n.sin_port = port;
if (inet_aton(host, &n.sin_addr)) {
if (verbose) {
fprintf(verbose, "trying [%s]\n",
inet_ntoa(n.sin_addr.s_addr));
}
done = ((sock = doconnect(&n, sizeof n, timeout)) >= 0);
} else {
h = gethostbyname(host);
if (!h) {
if (errors) {
#ifndef NO_HSTRERROR
fprintf(errors,
"%s: %s\n", host, hstrerror(h_errno));
#else
fprintf(errors,
"%s: cannot resolve hostname\n", host);
#endif
}
return -1;
}
for (hp = (u_int32_t**)h->h_addr_list; *hp; hp++) {
bcopy(*hp, (caddr_t)&n.sin_addr.s_addr, h->h_length);
if (verbose) {
fprintf(verbose,
"trying [%s]\n", inet_ntoa(**hp));
}
if ((sock = doconnect(&n, sizeof n, timeout)) >= 0) {
break;
}
}
done = (*hp != NULL);
}
if (!done) {
if (errors) {
fprintf(errors, "%s: %s\n", host, strerror(errno));
}
close(sock);
return -1;
}
return sock;
}
static void
sigalrm(int x) {
longjmp(jmpalrm, 1);
/*NOTREACHED*/
}
#endif /*WANT_TCPIP*/
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