1 /*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)rexec.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33
34 #include <sys/types.h>
35 #include <sys/socket.h>
36
37 #include <netinet/in.h>
38
39 #include <alloca.h>
40 #include <stdio.h>
41 #include <netdb.h>
42 #include <errno.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46 #include <sys/uio.h>
47 #include "libc-symbols.h"
48
49 int rexecoptions;
50 libc_freeres_ptr (static char *ahostbuf);
51
52 int
rexec_af(ahost,rport,name,pass,cmd,fd2p,af)53 rexec_af(ahost, rport, name, pass, cmd, fd2p, af)
54 char **ahost;
55 int rport;
56 const char *name, *pass, *cmd;
57 int *fd2p;
58 sa_family_t af;
59 {
60 struct sockaddr_storage sa2, from;
61 struct addrinfo hints, *res0;
62 const char *orig_name = name;
63 const char *orig_pass = pass;
64 u_short port = 0;
65 int s, timo = 1, s3;
66 char c;
67 int gai;
68 char servbuff[NI_MAXSERV];
69
70 snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport));
71 servbuff[sizeof(servbuff) - 1] = '\0';
72
73 memset(&hints, '\0', sizeof(hints));
74 hints.ai_family = af;
75 hints.ai_socktype = SOCK_STREAM;
76 hints.ai_flags = AI_CANONNAME;
77 gai = getaddrinfo(*ahost, servbuff, &hints, &res0);
78 if (gai){
79 /* XXX: set errno? */
80 return -1;
81 }
82
83 if (res0->ai_canonname){
84 free (ahostbuf);
85 ahostbuf = strdup (res0->ai_canonname);
86 if (ahostbuf == NULL) {
87 perror ("rexec: strdup");
88 return (-1);
89 }
90 *ahost = ahostbuf;
91 } else
92 *ahost = NULL;
93 ruserpass(res0->ai_canonname, &name, &pass);
94 retry:
95 s = socket(res0->ai_family, res0->ai_socktype, 0);
96 if (s < 0) {
97 perror("rexec: socket");
98 return (-1);
99 }
100 if (connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {
101 if (errno == ECONNREFUSED && timo <= 16) {
102 (void) __close(s);
103 sleep(timo);
104 timo *= 2;
105 goto retry;
106 }
107 perror(res0->ai_canonname);
108 return (-1);
109 }
110 if (fd2p == 0) {
111 (void) write(s, "", 1);
112 port = 0;
113 } else {
114 char num[32];
115 int s2, sa2len;
116
117 s2 = socket(res0->ai_family, res0->ai_socktype, 0);
118 if (s2 < 0) {
119 (void) __close(s);
120 return (-1);
121 }
122 listen(s2, 1);
123 sa2len = sizeof (sa2);
124 if (getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) {
125 perror("getsockname");
126 (void) __close(s2);
127 goto bad;
128 #ifdef SA_LEN
129 } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) {
130 __set_errno(EINVAL);
131 (void) __close(s2);
132 goto bad;
133 #endif
134 }
135 port = 0;
136 if (!getnameinfo((struct sockaddr *)&sa2, sa2len,
137 NULL, 0, servbuff, sizeof(servbuff),
138 NI_NUMERICSERV))
139 port = atoi(servbuff);
140 (void) sprintf(num, "%u", port);
141 (void) __write(s, num, strlen(num)+1);
142 { int len = sizeof (from);
143 s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from,
144 &len));
145 __close(s2);
146 if (s3 < 0) {
147 perror("accept");
148 port = 0;
149 goto bad;
150 }
151 }
152 *fd2p = s3;
153 }
154
155 struct iovec iov[3] =
156 {
157 [0] = { .iov_base = (void *) name, .iov_len = strlen (name) + 1 },
158 /* should public key encypt the password here */
159 [1] = { .iov_base = (void *) pass, .iov_len = strlen (pass) + 1 },
160 [2] = { .iov_base = (void *) cmd, .iov_len = strlen (cmd) + 1 }
161 };
162 (void) TEMP_FAILURE_RETRY (writev (s, iov, 3));
163
164 /* We don't need the memory allocated for the name and the password
165 in ruserpass anymore. */
166 if (name != orig_name)
167 free ((char *) name);
168 if (pass != orig_pass)
169 free ((char *) pass);
170
171 if (__read(s, &c, 1) != 1) {
172 perror(*ahost);
173 goto bad;
174 }
175 if (c != 0) {
176 while (__read(s, &c, 1) == 1) {
177 (void) __write(2, &c, 1);
178 if (c == '\n')
179 break;
180 }
181 goto bad;
182 }
183 freeaddrinfo(res0);
184 return (s);
185 bad:
186 if (port)
187 (void) __close(*fd2p);
188 (void) __close(s);
189 freeaddrinfo(res0);
190 return (-1);
191 }
192 libc_hidden_def (rexec_af)
193
194 int
195 rexec(ahost, rport, name, pass, cmd, fd2p)
196 char **ahost;
197 int rport;
198 const char *name, *pass, *cmd;
199 int *fd2p;
200 {
201 return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);
202 }
203