/* $NetBSD: rcmd.c,v 1.12 1995/06/03 22:33:34 mycroft Exp $ */ /* * Copyright (c) 1983, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94"; #else static char *rcsid = "$NetBSD: rcmd.c,v 1.12 1995/06/03 22:33:34 mycroft Exp $"; #endif #endif /* LIBC_SCCS and not lint */ #define MAXPATHLEN 1024 #ifndef MAXHOSTNAMELEN #define MAXHOSTNAMELEN 256 #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include int rcmd(ahost, rport, locuser, remuser, cmd, fd2p) char **ahost; u_short rport; const char *locuser, *remuser, *cmd; int *fd2p; { struct hostent *hp; struct sockaddr_in sin, from; fd_set reads; long oldmask; pid_t pid; int s, lport, timo; char c; pid = getpid(); hp = gethostbyname(*ahost); if (hp == NULL) { /*herror(*ahost);*/ (void)fprintf(stderr, "rcmd: socket: gethostbyname failed for %s\n", *ahost); return (-1); } *ahost = hp->h_name; /* oldmask = sigblock(sigmask(SIGURG)); */ for (timo = 1, lport = IPPORT_RESERVED - 1;;) { s = rresvport(&lport); if (s < 0) { if (errno == EDEADLK) /* EDEADLK */ (void)fprintf(stderr, "rcmd: socket: All ports in use\n"); else (void)fprintf(stderr, "rcmd: socket: %s\n", strerror(errno)); /* sigsetmask(oldmask); */ return (-1); } fcntl(s, F_SETOWN, pid); sin.sin_len = sizeof(struct sockaddr_in); sin.sin_family = hp->h_addrtype; sin.sin_port = rport; bcopy(hp->h_addr_list[0], &sin.sin_addr, hp->h_length); if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) break; (void)close(s); if (errno == EADDRINUSE) { lport--; continue; } if (errno == ECONNREFUSED && timo <= 16) { (void)sleep(timo); timo *= 2; continue; } if (hp->h_addr_list[1] != NULL) { int oerrno = errno; (void)fprintf(stderr, "connect to address %s: ", inet_ntoa(sin.sin_addr)); errno = oerrno; perror(0); hp->h_addr_list++; bcopy(hp->h_addr_list[0], &sin.sin_addr, hp->h_length); (void)fprintf(stderr, "Trying %s...\n", inet_ntoa(sin.sin_addr)); continue; } (void)fprintf(stderr, "%s: %s\n", hp->h_name, strerror(errno)); /* sigsetmask(oldmask); */ return (-1); } lport--; if (fd2p == 0) { write(s, "", 1); lport = 0; } else { char num[8]; int s2 = rresvport(&lport), s3; int len = sizeof(from); if (s2 < 0) goto bad; listen(s2, 1); /*(void)snprintf(num, sizeof(num), "%d", lport);*/ sprintf(num,"%d", lport); if (write(s, num, strlen(num)+1) != strlen(num)+1) { (void)fprintf(stderr, "rcmd: write (setting up stderr): %s\n", strerror(errno)); (void)close(s2); goto bad; } FD_ZERO(&reads); FD_SET(s, &reads); FD_SET(s2, &reads); errno = 0; if (select(MAX(s, s2) + 1, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)) { if (errno != 0) (void)fprintf(stderr, "rcmd: select (setting up stderr): %s\n", strerror(errno)); else (void)fprintf(stderr, "select: protocol failure in circuit setup\n"); (void)close(s2); goto bad; } s3 = accept(s2, (struct sockaddr *)&from, &len); (void)close(s2); if (s3 < 0) { (void)fprintf(stderr, "rcmd: accept: %s\n", strerror(errno)); lport = 0; goto bad; } *fd2p = s3; from.sin_port = ntohs(from.sin_port); if (from.sin_family != AF_INET || from.sin_port >= IPPORT_RESERVED || from.sin_port < IPPORT_RESERVED / 2) { (void)fprintf(stderr, "socket: protocol failure in circuit setup.\n"); goto bad2; } } (void)write(s, locuser, strlen(locuser)+1); (void)write(s, remuser, strlen(remuser)+1); (void)write(s, cmd, strlen(cmd)+1); if (read(s, &c, 1) != 1) { (void)fprintf(stderr, "rcmd: %s: %s\n", *ahost, strerror(errno)); goto bad2; } if (c != 0) { while (read(s, &c, 1) == 1) { (void)write(STDERR_FILENO, &c, 1); if (c == '\n') break; } goto bad2; } /* sigsetmask(oldmask); */ return (s); bad2: if (lport) (void)close(*fd2p); bad: (void)close(s); /* sigsetmask(oldmask); */ return (-1); } int rresvport(alport) int *alport; { struct sockaddr_in sin; int s; sin.sin_len = sizeof(struct sockaddr_in); sin.sin_family = AF_INET; sin.sin_addr.s_addr = INADDR_ANY; s = socket(AF_INET, SOCK_STREAM, 0); if (s < 0) return (-1); for (;;) { sin.sin_port = htons((u_short)*alport); if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) return (s); if (errno != EADDRINUSE) { (void)close(s); return (-1); } (*alport)--; if (*alport == IPPORT_RESERVED/2) { (void)close(s); errno = EDEADLK; /* close */ return (-1); } } }