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28f540f4 RM |
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. | |
28f540f4 RM |
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 | ||
e4cf5070 | 39 | #include <alloca.h> |
28f540f4 RM |
40 | #include <stdio.h> |
41 | #include <netdb.h> | |
42 | #include <errno.h> | |
3846463e | 43 | #include <stdlib.h> |
84384f5b UD |
44 | #include <string.h> |
45 | #include <unistd.h> | |
039c1b75 | 46 | #include <sys/uio.h> |
28f540f4 | 47 | |
28f540f4 | 48 | int rexecoptions; |
c877418f | 49 | libc_freeres_ptr (static char *ahostbuf); |
28f540f4 | 50 | |
84384f5b | 51 | int |
2d29aba9 | 52 | rexec_af(ahost, rport, name, pass, cmd, fd2p, af) |
28f540f4 RM |
53 | char **ahost; |
54 | int rport; | |
e7fd8a39 | 55 | const char *name, *pass, *cmd; |
28f540f4 | 56 | int *fd2p; |
2d29aba9 | 57 | sa_family_t af; |
28f540f4 | 58 | { |
2d29aba9 UD |
59 | struct sockaddr_storage sa2, from; |
60 | struct addrinfo hints, *res0; | |
8a3c8443 UD |
61 | const char *orig_name = name; |
62 | const char *orig_pass = pass; | |
3846463e | 63 | u_short port = 0; |
28f540f4 RM |
64 | int s, timo = 1, s3; |
65 | char c; | |
3846463e | 66 | int gai; |
2d29aba9 UD |
67 | char servbuff[NI_MAXSERV]; |
68 | ||
0bb258e3 | 69 | __snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport)); |
2d29aba9 | 70 | servbuff[sizeof(servbuff) - 1] = '\0'; |
e4cf5070 | 71 | |
d372f89a | 72 | memset(&hints, '\0', sizeof(hints)); |
2d29aba9 UD |
73 | hints.ai_family = af; |
74 | hints.ai_socktype = SOCK_STREAM; | |
75 | hints.ai_flags = AI_CANONNAME; | |
3846463e UD |
76 | gai = getaddrinfo(*ahost, servbuff, &hints, &res0); |
77 | if (gai){ | |
2d29aba9 UD |
78 | /* XXX: set errno? */ |
79 | return -1; | |
80 | } | |
28f540f4 | 81 | |
2d29aba9 | 82 | if (res0->ai_canonname){ |
c877418f RM |
83 | free (ahostbuf); |
84 | ahostbuf = strdup (res0->ai_canonname); | |
85 | if (ahostbuf == NULL) { | |
86 | perror ("rexec: strdup"); | |
87 | return (-1); | |
88 | } | |
2d29aba9 | 89 | *ahost = ahostbuf; |
0ecb606c | 90 | } else { |
2d29aba9 | 91 | *ahost = NULL; |
0ecb606c JJ |
92 | __set_errno (ENOENT); |
93 | return -1; | |
94 | } | |
2d29aba9 | 95 | ruserpass(res0->ai_canonname, &name, &pass); |
28f540f4 | 96 | retry: |
2d29aba9 | 97 | s = __socket(res0->ai_family, res0->ai_socktype, 0); |
28f540f4 RM |
98 | if (s < 0) { |
99 | perror("rexec: socket"); | |
100 | return (-1); | |
101 | } | |
2d29aba9 | 102 | if (__connect(s, res0->ai_addr, res0->ai_addrlen) < 0) { |
28f540f4 | 103 | if (errno == ECONNREFUSED && timo <= 16) { |
50304ef0 UD |
104 | (void) __close(s); |
105 | __sleep(timo); | |
28f540f4 RM |
106 | timo *= 2; |
107 | goto retry; | |
108 | } | |
2d29aba9 | 109 | perror(res0->ai_canonname); |
28f540f4 RM |
110 | return (-1); |
111 | } | |
112 | if (fd2p == 0) { | |
50304ef0 | 113 | (void) __write(s, "", 1); |
28f540f4 RM |
114 | port = 0; |
115 | } else { | |
d68171ed | 116 | char num[32]; |
0ecb606c JJ |
117 | int s2; |
118 | socklen_t sa2len; | |
d68171ed | 119 | |
2d29aba9 | 120 | s2 = __socket(res0->ai_family, res0->ai_socktype, 0); |
28f540f4 | 121 | if (s2 < 0) { |
50304ef0 | 122 | (void) __close(s); |
28f540f4 RM |
123 | return (-1); |
124 | } | |
b2bffca2 | 125 | __listen(s2, 1); |
2d29aba9 | 126 | sa2len = sizeof (sa2); |
b2bffca2 | 127 | if (__getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) { |
28f540f4 | 128 | perror("getsockname"); |
50304ef0 | 129 | (void) __close(s2); |
28f540f4 | 130 | goto bad; |
eacde9d0 UD |
131 | } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) { |
132 | __set_errno(EINVAL); | |
133 | (void) __close(s2); | |
134 | goto bad; | |
28f540f4 | 135 | } |
2d29aba9 UD |
136 | port = 0; |
137 | if (!getnameinfo((struct sockaddr *)&sa2, sa2len, | |
138 | NULL, 0, servbuff, sizeof(servbuff), | |
139 | NI_NUMERICSERV)) | |
140 | port = atoi(servbuff); | |
28f540f4 | 141 | (void) sprintf(num, "%u", port); |
50304ef0 | 142 | (void) __write(s, num, strlen(num)+1); |
0ecb606c | 143 | { socklen_t len = sizeof (from); |
039c1b75 UD |
144 | s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from, |
145 | &len)); | |
50304ef0 | 146 | __close(s2); |
28f540f4 RM |
147 | if (s3 < 0) { |
148 | perror("accept"); | |
149 | port = 0; | |
150 | goto bad; | |
151 | } | |
152 | } | |
153 | *fd2p = s3; | |
154 | } | |
039c1b75 UD |
155 | |
156 | struct iovec iov[3] = | |
157 | { | |
158 | [0] = { .iov_base = (void *) name, .iov_len = strlen (name) + 1 }, | |
159 | /* should public key encypt the password here */ | |
160 | [1] = { .iov_base = (void *) pass, .iov_len = strlen (pass) + 1 }, | |
161 | [2] = { .iov_base = (void *) cmd, .iov_len = strlen (cmd) + 1 } | |
162 | }; | |
163 | (void) TEMP_FAILURE_RETRY (__writev (s, iov, 3)); | |
8a3c8443 UD |
164 | |
165 | /* We don't need the memory allocated for the name and the password | |
166 | in ruserpass anymore. */ | |
167 | if (name != orig_name) | |
3846463e | 168 | free ((char *) name); |
8a3c8443 | 169 | if (pass != orig_pass) |
3846463e | 170 | free ((char *) pass); |
8a3c8443 | 171 | |
50304ef0 | 172 | if (__read(s, &c, 1) != 1) { |
28f540f4 RM |
173 | perror(*ahost); |
174 | goto bad; | |
175 | } | |
176 | if (c != 0) { | |
50304ef0 UD |
177 | while (__read(s, &c, 1) == 1) { |
178 | (void) __write(2, &c, 1); | |
28f540f4 RM |
179 | if (c == '\n') |
180 | break; | |
181 | } | |
182 | goto bad; | |
183 | } | |
2d29aba9 | 184 | freeaddrinfo(res0); |
28f540f4 RM |
185 | return (s); |
186 | bad: | |
187 | if (port) | |
50304ef0 UD |
188 | (void) __close(*fd2p); |
189 | (void) __close(s); | |
2d29aba9 | 190 | freeaddrinfo(res0); |
28f540f4 RM |
191 | return (-1); |
192 | } | |
cb09a2cd | 193 | libc_hidden_def (rexec_af) |
2d29aba9 UD |
194 | |
195 | int | |
196 | rexec(ahost, rport, name, pass, cmd, fd2p) | |
197 | char **ahost; | |
198 | int rport; | |
199 | const char *name, *pass, *cmd; | |
200 | int *fd2p; | |
201 | { | |
202 | return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET); | |
203 | } |