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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> | |
84384f5b UD |
43 | #include <string.h> |
44 | #include <unistd.h> | |
28f540f4 | 45 | |
28f540f4 | 46 | int rexecoptions; |
2d29aba9 | 47 | char ahostbuf[NI_MAXHOST]; |
28f540f4 | 48 | |
84384f5b | 49 | int |
2d29aba9 | 50 | rexec_af(ahost, rport, name, pass, cmd, fd2p, af) |
28f540f4 RM |
51 | char **ahost; |
52 | int rport; | |
e7fd8a39 | 53 | const char *name, *pass, *cmd; |
28f540f4 | 54 | int *fd2p; |
2d29aba9 | 55 | sa_family_t af; |
28f540f4 | 56 | { |
2d29aba9 UD |
57 | struct sockaddr_storage sa2, from; |
58 | struct addrinfo hints, *res0; | |
8a3c8443 UD |
59 | const char *orig_name = name; |
60 | const char *orig_pass = pass; | |
28f540f4 RM |
61 | u_short port; |
62 | int s, timo = 1, s3; | |
63 | char c; | |
e4cf5070 | 64 | int herr; |
2d29aba9 UD |
65 | int gai, ok; |
66 | char servbuff[NI_MAXSERV]; | |
67 | ||
68 | snprintf(servbuff, sizeof(servbuff), "%d", rport); | |
69 | servbuff[sizeof(servbuff) - 1] = '\0'; | |
e4cf5070 | 70 | |
2d29aba9 UD |
71 | memset(&hints, 0, sizeof(hints)); |
72 | hints.ai_family = af; | |
73 | hints.ai_socktype = SOCK_STREAM; | |
74 | hints.ai_flags = AI_CANONNAME; | |
75 | if (gai = getaddrinfo(*ahost, servbuff, &hints, &res0)){ | |
76 | /* XXX: set errno? */ | |
77 | return -1; | |
78 | } | |
28f540f4 | 79 | |
2d29aba9 UD |
80 | if (res0->ai_canonname){ |
81 | strncpy(ahostbuf, res0->ai_canonname, sizeof(ahostbuf)); | |
82 | ahostbuf[sizeof(ahostbuf)-1] = '\0'; | |
83 | *ahost = ahostbuf; | |
84 | } | |
85 | else{ | |
86 | *ahost = NULL; | |
87 | } | |
88 | ruserpass(res0->ai_canonname, &name, &pass); | |
28f540f4 | 89 | retry: |
2d29aba9 | 90 | s = __socket(res0->ai_family, res0->ai_socktype, 0); |
28f540f4 RM |
91 | if (s < 0) { |
92 | perror("rexec: socket"); | |
93 | return (-1); | |
94 | } | |
2d29aba9 | 95 | if (__connect(s, res0->ai_addr, res0->ai_addrlen) < 0) { |
28f540f4 | 96 | if (errno == ECONNREFUSED && timo <= 16) { |
50304ef0 UD |
97 | (void) __close(s); |
98 | __sleep(timo); | |
28f540f4 RM |
99 | timo *= 2; |
100 | goto retry; | |
101 | } | |
2d29aba9 | 102 | perror(res0->ai_canonname); |
28f540f4 RM |
103 | return (-1); |
104 | } | |
105 | if (fd2p == 0) { | |
50304ef0 | 106 | (void) __write(s, "", 1); |
28f540f4 RM |
107 | port = 0; |
108 | } else { | |
d68171ed | 109 | char num[32]; |
2d29aba9 | 110 | int s2, sa2len; |
d68171ed | 111 | |
2d29aba9 | 112 | s2 = __socket(res0->ai_family, res0->ai_socktype, 0); |
28f540f4 | 113 | if (s2 < 0) { |
50304ef0 | 114 | (void) __close(s); |
28f540f4 RM |
115 | return (-1); |
116 | } | |
117 | listen(s2, 1); | |
2d29aba9 UD |
118 | sa2len = sizeof (sa2); |
119 | if (getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0 || | |
4974d2b2 | 120 | sa2len != SA_LEN((struct sockaddr *)&sa2)) { |
28f540f4 | 121 | perror("getsockname"); |
50304ef0 | 122 | (void) __close(s2); |
28f540f4 RM |
123 | goto bad; |
124 | } | |
2d29aba9 UD |
125 | port = 0; |
126 | if (!getnameinfo((struct sockaddr *)&sa2, sa2len, | |
127 | NULL, 0, servbuff, sizeof(servbuff), | |
128 | NI_NUMERICSERV)) | |
129 | port = atoi(servbuff); | |
28f540f4 | 130 | (void) sprintf(num, "%u", port); |
50304ef0 | 131 | (void) __write(s, num, strlen(num)+1); |
28f540f4 RM |
132 | { int len = sizeof (from); |
133 | s3 = accept(s2, (struct sockaddr *)&from, &len); | |
50304ef0 | 134 | __close(s2); |
28f540f4 RM |
135 | if (s3 < 0) { |
136 | perror("accept"); | |
137 | port = 0; | |
138 | goto bad; | |
139 | } | |
140 | } | |
141 | *fd2p = s3; | |
142 | } | |
50304ef0 | 143 | (void) __write(s, name, strlen(name) + 1); |
28f540f4 | 144 | /* should public key encypt the password here */ |
50304ef0 UD |
145 | (void) __write(s, pass, strlen(pass) + 1); |
146 | (void) __write(s, cmd, strlen(cmd) + 1); | |
8a3c8443 UD |
147 | |
148 | /* We don't need the memory allocated for the name and the password | |
149 | in ruserpass anymore. */ | |
150 | if (name != orig_name) | |
151 | free (name); | |
152 | if (pass != orig_pass) | |
153 | free (pass); | |
154 | ||
50304ef0 | 155 | if (__read(s, &c, 1) != 1) { |
28f540f4 RM |
156 | perror(*ahost); |
157 | goto bad; | |
158 | } | |
159 | if (c != 0) { | |
50304ef0 UD |
160 | while (__read(s, &c, 1) == 1) { |
161 | (void) __write(2, &c, 1); | |
28f540f4 RM |
162 | if (c == '\n') |
163 | break; | |
164 | } | |
165 | goto bad; | |
166 | } | |
2d29aba9 | 167 | freeaddrinfo(res0); |
28f540f4 RM |
168 | return (s); |
169 | bad: | |
170 | if (port) | |
50304ef0 UD |
171 | (void) __close(*fd2p); |
172 | (void) __close(s); | |
2d29aba9 | 173 | freeaddrinfo(res0); |
28f540f4 RM |
174 | return (-1); |
175 | } | |
2d29aba9 UD |
176 | |
177 | int | |
178 | rexec(ahost, rport, name, pass, cmd, fd2p) | |
179 | char **ahost; | |
180 | int rport; | |
181 | const char *name, *pass, *cmd; | |
182 | int *fd2p; | |
183 | { | |
184 | return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET); | |
185 | } |