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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [net/] [rcmdsh.c] - Rev 859
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/* $OpenBSD: rcmdsh.c,v 1.5 1998/04/25 16:23:58 millert Exp $ */ /* * Copyright (c) 2001, MagniComp * 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. Neither the name of the MagniComp 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 COPYRIGHT HOLDERS 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. */ /* * This is an rcmd() replacement originally by * Chris Siebenmann <cks@utcc.utoronto.ca>. */ #include <sys/cdefs.h> #include <sys/types.h> #include <machine/endian.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/wait.h> #include <errno.h> #include <netdb.h> #include <paths.h> #include <pwd.h> #include <stdio.h> #include <string.h> #include <unistd.h> #ifndef _PATH_RSH #define _PATH_RSH "/usr/bin/rsh" #endif /* * This is a replacement rcmd() function that uses the rsh(1) * program in place of a direct rcmd(3) function call so as to * avoid having to be root. Note that rport is ignored. */ int rcmdsh(ahost, rport, locuser, remuser, cmd, rshprog) char **ahost; int rport; const char *locuser, *remuser, *cmd, *rshprog; { struct addrinfo hints, *res; int cpid, sp[2], error; char *p; struct passwd *pw; char num[8]; static char hbuf[NI_MAXHOST]; /* What rsh/shell to use. */ if (rshprog == NULL) rshprog = _PATH_RSH; /* locuser must exist on this host. */ if ((pw = getpwnam(locuser)) == NULL) { (void)fprintf(stderr, "rcmdsh: unknown user: %s\n", locuser); return (-1); } /* Validate remote hostname. */ if (strcmp(*ahost, "localhost") != 0) { memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_STREAM; (void)snprintf(num, sizeof(num), "%d", ntohs(rport)); error = getaddrinfo(*ahost, num, &hints, &res); if (error) { fprintf(stderr, "rcmdsh: getaddrinfo: %s\n", gai_strerror(error)); return (-1); } if (res->ai_canonname) { strncpy(hbuf, res->ai_canonname, sizeof(hbuf) - 1); hbuf[sizeof(hbuf) - 1] = '\0'; *ahost = hbuf; } freeaddrinfo(res); } /* Get a socketpair we'll use for stdin and stdout. */ if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, sp) == -1) { perror("rcmdsh: socketpair"); return (-1); } cpid = fork(); if (cpid == -1) { perror("rcmdsh: fork failed"); return (-1); } else if (cpid == 0) { /* * Child. We use sp[1] to be stdin/stdout, and close sp[0]. */ (void)close(sp[0]); if (dup2(sp[1], 0) == -1 || dup2(0, 1) == -1) { perror("rcmdsh: dup2 failed"); _exit(255); } /* Fork again to lose parent. */ cpid = fork(); if (cpid == -1) { perror("rcmdsh: fork to lose parent failed"); _exit(255); } if (cpid > 0) _exit(0); /* In grandchild here. Become local user for rshprog. */ if (setuid(pw->pw_uid) == -1) { (void)fprintf(stderr, "rcmdsh: setuid(%u): %s\n", pw->pw_uid, strerror(errno)); _exit(255); } /* * If remote host is "localhost" and local and remote users * are the same, avoid running remote shell for efficiency. */ if (strcmp(*ahost, "localhost") == 0 && strcmp(locuser, remuser) == 0) { if (pw->pw_shell[0] == '\0') rshprog = _PATH_BSHELL; else rshprog = pw->pw_shell; p = strrchr(rshprog, '/'); execlp(rshprog, p ? p + 1 : rshprog, "-c", cmd, (char *)NULL); } else { p = strrchr(rshprog, '/'); execlp(rshprog, p ? p + 1 : rshprog, *ahost, "-l", remuser, cmd, (char *)NULL); } (void)fprintf(stderr, "rcmdsh: execlp %s failed: %s\n", rshprog, strerror(errno)); _exit(255); } else { /* Parent. close sp[1], return sp[0]. */ (void)close(sp[1]); /* Reap child. */ (void)wait(NULL); return (sp[0]); } /* NOTREACHED */ }
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