/* * Copyright (c) 1980, 1993 * 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. * 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. */ #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <alloca.h> #include <stdio.h> #include <netdb.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #define SA_LEN(_x) __libc_sa_len((_x)->sa_family) extern int __libc_sa_len(sa_family_t __af) __THROW attribute_hidden; /* int rexecoptions; - google does not know it */ static char ahostbuf[NI_MAXHOST]; int rexec_af(char **ahost, int rport, const char *name, const char *pass, const char *cmd, int *fd2p, sa_family_t af) { struct sockaddr_storage sa2, from; struct addrinfo hints, *res0; const char *orig_name = name; const char *orig_pass = pass; u_short port = 0; int s, timo = 1, s3; char c; int gai; char servbuff[NI_MAXSERV]; if (sizeof(servbuff) < sizeof(int)*3 + 2) { snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport)); servbuff[sizeof(servbuff) - 1] = '\0'; } else { sprintf(servbuff, "%d", ntohs(rport)); } memset(&hints, '\0', sizeof(hints)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_CANONNAME; gai = getaddrinfo(*ahost, servbuff, &hints, &res0); if (gai) { /* XXX: set errno? */ return -1; } if (res0->ai_canonname) { strncpy(ahostbuf, res0->ai_canonname, sizeof(ahostbuf)); ahostbuf[sizeof(ahostbuf)-1] = '\0'; *ahost = ahostbuf; } else { *ahost = NULL; __set_errno(ENOENT); return -1; } ruserpass(res0->ai_canonname, &name, &pass); retry: s = socket(res0->ai_family, res0->ai_socktype, 0); if (s < 0) { perror("rexec: socket"); return -1; } if (connect(s, res0->ai_addr, res0->ai_addrlen) < 0) { if (errno == ECONNREFUSED && timo <= 16) { (void) close(s); sleep(timo); timo *= 2; goto retry; } perror(res0->ai_canonname); return -1; } if (fd2p == 0) { (void) write(s, "", 1); port = 0; } else { char num[32]; int s2; socklen_t sa2len; s2 = socket(res0->ai_family, res0->ai_socktype, 0); if (s2 < 0) { (void) close(s); return -1; } listen(s2, 1); sa2len = sizeof(sa2); if (getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) { perror("getsockname"); (void) close(s2); goto bad; } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) { __set_errno(EINVAL); (void) close(s2); goto bad; } port = 0; if (!getnameinfo((struct sockaddr *)&sa2, sa2len, NULL, 0, servbuff, sizeof(servbuff), NI_NUMERICSERV)) port = atoi(servbuff); (void) sprintf(num, "%u", port); (void) write(s, num, strlen(num)+1); { socklen_t len = sizeof(from); s3 = TEMP_FAILURE_RETRY(accept(s2, (struct sockaddr *)&from, &len)); close(s2); if (s3 < 0) { perror("accept"); port = 0; goto bad; } } *fd2p = s3; } (void) write(s, name, strlen(name) + 1); /* should public key encypt the password here */ (void) write(s, pass, strlen(pass) + 1); (void) write(s, cmd, strlen(cmd) + 1); /* We don't need the memory allocated for the name and the password in ruserpass anymore. */ if (name != orig_name) free((char *) name); if (pass != orig_pass) free((char *) pass); if (read(s, &c, 1) != 1) { perror(*ahost); goto bad; } if (c != 0) { while (read(s, &c, 1) == 1) { (void) write(2, &c, 1); if (c == '\n') break; } goto bad; } freeaddrinfo(res0); return s; bad: if (port) (void) close(*fd2p); (void) close(s); freeaddrinfo(res0); return -1; } libc_hidden_def(rexec_af) int rexec(char **ahost, int rport, const char *name, const char *pass, const char *cmd, int *fd2p) { return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET); }