2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/types.h>
33 #include <sys/socket.h>
35 #include <netinet/in.h>
45 # define __TEMP_FAILURE_RETRY(expression) \
47 ({ long int __result; \
48 do __result = (long int) (expression); \
49 while (__result == -1L && errno == EINTR); \
52 #define SA_LEN(_x) __libc_sa_len((_x)->sa_family)
53 extern int __libc_sa_len(sa_family_t __af) __THROW attribute_hidden;
55 /* int rexecoptions; - google does not know it */
56 static char ahostbuf[NI_MAXHOST];
59 rexec_af(char **ahost, int rport, const char *name, const char *pass, const char *cmd, int *fd2p, sa_family_t af)
61 struct sockaddr_storage sa2, from;
62 struct addrinfo hints, *res0;
63 const char *orig_name = name;
64 const char *orig_pass = pass;
69 char servbuff[NI_MAXSERV];
71 if (sizeof(servbuff) < sizeof(int)*3 + 2) {
72 snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport));
73 servbuff[sizeof(servbuff) - 1] = '\0';
75 sprintf(servbuff, "%d", ntohs(rport));
78 memset(&hints, '\0', sizeof(hints));
80 hints.ai_socktype = SOCK_STREAM;
81 hints.ai_flags = AI_CANONNAME;
82 gai = getaddrinfo(*ahost, servbuff, &hints, &res0);
88 if (res0->ai_canonname) {
89 strncpy(ahostbuf, res0->ai_canonname, sizeof(ahostbuf));
90 ahostbuf[sizeof(ahostbuf)-1] = '\0';
98 ruserpass(res0->ai_canonname, &name, &pass);
100 s = socket(res0->ai_family, res0->ai_socktype, 0);
102 perror("rexec: socket");
105 if (connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {
106 if (errno == ECONNREFUSED && timo <= 16) {
112 perror(res0->ai_canonname);
116 (void) write(s, "", 1);
123 s2 = socket(res0->ai_family, res0->ai_socktype, 0);
129 sa2len = sizeof(sa2);
130 if (getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) {
131 perror("getsockname");
134 } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) {
140 if (!getnameinfo((struct sockaddr *)&sa2, sa2len,
141 NULL, 0, servbuff, sizeof(servbuff),
143 port = atoi(servbuff);
144 (void) sprintf(num, "%u", port);
145 (void) write(s, num, strlen(num)+1);
147 socklen_t len = sizeof(from);
148 s3 = __TEMP_FAILURE_RETRY(accept(s2,
149 (struct sockaddr *)&from, &len));
159 (void) write(s, name, strlen(name) + 1);
160 /* should public key encypt the password here */
161 (void) write(s, pass, strlen(pass) + 1);
162 (void) write(s, cmd, strlen(cmd) + 1);
164 /* We don't need the memory allocated for the name and the password
165 in ruserpass anymore. */
166 if (name != orig_name)
168 if (pass != orig_pass)
171 if (read(s, &c, 1) != 1) {
176 while (read(s, &c, 1) == 1) {
177 (void) write(2, &c, 1);
192 libc_hidden_def(rexec_af)
195 rexec(char **ahost, int rport, const char *name, const char *pass,
196 const char *cmd, int *fd2p)
198 return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);