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)
31static 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
48int rexecoptions;
49libc_freeres_ptr (static char *ahostbuf);
50
51int
52rexec_af (char **ahost, int rport, const char *name, const char *pass,
53 const char *cmd, int *fd2p, sa_family_t af)
54{
55 struct sockaddr_storage from;
56 struct addrinfo hints, *res0;
57 const char *orig_name = name;
58 const char *orig_pass = pass;
59 u_short port = 0;
60 int s, timo = 1, s3;
61 char c;
62 int gai;
63 char servbuff[NI_MAXSERV];
64
65 __snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport));
66 servbuff[sizeof(servbuff) - 1] = '\0';
67
68 memset(&hints, '\0', sizeof(hints));
69 hints.ai_family = af;
70 hints.ai_socktype = SOCK_STREAM;
71 hints.ai_flags = AI_CANONNAME;
72 gai = getaddrinfo(*ahost, servbuff, &hints, &res0);
73 if (gai){
74 /* XXX: set errno? */
75 return -1;
76 }
77
78 if (res0->ai_canonname){
79 free (ahostbuf);
80 ahostbuf = strdup (res0->ai_canonname);
81 if (ahostbuf == NULL) {
82 perror ("rexec: strdup");
83 return (-1);
84 }
85 *ahost = ahostbuf;
86 } else {
87 *ahost = NULL;
88 __set_errno (ENOENT);
89 return -1;
90 }
91 ruserpass(res0->ai_canonname, &name, &pass);
92retry:
93 s = __socket(res0->ai_family, res0->ai_socktype, 0);
94 if (s < 0) {
95 perror("rexec: socket");
96 return (-1);
97 }
98 if (__connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {
99 if (errno == ECONNREFUSED && timo <= 16) {
100 (void) __close(s);
101 __sleep(timo);
102 timo *= 2;
103 goto retry;
104 }
105 perror(res0->ai_canonname);
106 return (-1);
107 }
108 if (fd2p == 0) {
109 (void) __write(s, "", 1);
110 port = 0;
111 } else {
112 char num[32];
113 int s2;
114 union
115 {
116 struct sockaddr_storage ss;
117 struct sockaddr sa;
118 } sa2;
119 socklen_t sa2len;
120
121 s2 = __socket(res0->ai_family, res0->ai_socktype, 0);
122 if (s2 < 0) {
123 (void) __close(s);
124 return (-1);
125 }
126 __listen(s2, 1);
127 sa2len = sizeof (sa2);
128 if (__getsockname(s2, &sa2.sa, &sa2len) < 0) {
129 perror("getsockname");
130 (void) __close(s2);
131 goto bad;
132 } else if (sa2len != SA_LEN(&sa2.sa)) {
133 __set_errno(EINVAL);
134 (void) __close(s2);
135 goto bad;
136 }
137 port = 0;
138 if (!getnameinfo(&sa2.sa, sa2len,
139 NULL, 0, servbuff, sizeof(servbuff),
140 NI_NUMERICSERV))
141 port = atoi(servbuff);
142 (void) sprintf(num, "%u", port);
143 (void) __write(s, num, strlen(num)+1);
144 { socklen_t len = sizeof (from);
145 s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from,
146 &len));
147 __close(s2);
148 if (s3 < 0) {
149 perror("accept");
150 port = 0;
151 goto bad;
152 }
153 }
154 *fd2p = s3;
155 }
156
157 struct iovec iov[3] =
158 {
159 [0] = { .iov_base = (void *) name, .iov_len = strlen (name) + 1 },
160 /* should public key encypt the password here */
161 [1] = { .iov_base = (void *) pass, .iov_len = strlen (pass) + 1 },
162 [2] = { .iov_base = (void *) cmd, .iov_len = strlen (cmd) + 1 }
163 };
164 (void) TEMP_FAILURE_RETRY (__writev (s, iov, 3));
165
166 /* We don't need the memory allocated for the name and the password
167 in ruserpass anymore. */
168 if (name != orig_name)
169 free ((char *) name);
170 if (pass != orig_pass)
171 free ((char *) pass);
172
173 if (__read(s, &c, 1) != 1) {
174 perror(*ahost);
175 goto bad;
176 }
177 if (c != 0) {
178 while (__read(s, &c, 1) == 1) {
179 (void) __write(2, &c, 1);
180 if (c == '\n')
181 break;
182 }
183 goto bad;
184 }
185 freeaddrinfo(res0);
186 return (s);
187bad:
188 if (port)
189 (void) __close(*fd2p);
190 (void) __close(s);
191 freeaddrinfo(res0);
192 return (-1);
193}
194libc_hidden_def (rexec_af)
195
196int
197rexec (char **ahost, int rport, const char *name, const char *pass,
198 const char *cmd, int *fd2p)
199{
200 return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);
201}
202