Update.
[glibc.git] / inet / rexec.c
blob72df066b03eb9bf3f9d875da68f146b44b5dbe49
1 /*
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
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)rexec.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
38 #include <sys/types.h>
39 #include <sys/socket.h>
41 #include <netinet/in.h>
43 #include <alloca.h>
44 #include <stdio.h>
45 #include <netdb.h>
46 #include <errno.h>
47 #include <string.h>
48 #include <unistd.h>
50 int rexecoptions;
52 int
53 rexec(ahost, rport, name, pass, cmd, fd2p)
54 char **ahost;
55 int rport;
56 const char *name, *pass, *cmd;
57 int *fd2p;
59 struct sockaddr_in sin, sin2, from;
60 struct hostent hostbuf, *hp;
61 size_t hstbuflen;
62 char *hsttmpbuf;
63 u_short port;
64 int s, timo = 1, s3;
65 char c;
66 int herr;
68 hstbuflen = 1024;
69 hsttmpbuf = __alloca (hstbuflen);
70 while (__gethostbyname_r (*ahost, &hostbuf, hsttmpbuf, hstbuflen,
71 &hp, &herr) < 0)
72 if (herr != NETDB_INTERNAL || errno != ERANGE)
74 __set_h_errno (herr);
75 herror(*ahost);
76 return -1;
78 else
80 /* Enlarge the buffer. */
81 hstbuflen *= 2;
82 hsttmpbuf = __alloca (hstbuflen);
85 *ahost = hp->h_name;
86 ruserpass(hp->h_name, &name, &pass);
87 retry:
88 s = socket(AF_INET, SOCK_STREAM, 0);
89 if (s < 0) {
90 perror("rexec: socket");
91 return (-1);
93 sin.sin_family = hp->h_addrtype;
94 sin.sin_port = rport;
95 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
96 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
97 if (errno == ECONNREFUSED && timo <= 16) {
98 (void) close(s);
99 sleep(timo);
100 timo *= 2;
101 goto retry;
103 perror(hp->h_name);
104 return (-1);
106 if (fd2p == 0) {
107 (void) write(s, "", 1);
108 port = 0;
109 } else {
110 char num[32];
111 int s2, sin2len;
113 s2 = socket(AF_INET, SOCK_STREAM, 0);
114 if (s2 < 0) {
115 (void) close(s);
116 return (-1);
118 listen(s2, 1);
119 sin2len = sizeof (sin2);
120 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
121 sin2len != sizeof (sin2)) {
122 perror("getsockname");
123 (void) close(s2);
124 goto bad;
126 port = ntohs((u_short)sin2.sin_port);
127 (void) sprintf(num, "%u", port);
128 (void) write(s, num, strlen(num)+1);
129 { int len = sizeof (from);
130 s3 = accept(s2, (struct sockaddr *)&from, &len);
131 close(s2);
132 if (s3 < 0) {
133 perror("accept");
134 port = 0;
135 goto bad;
138 *fd2p = s3;
140 (void) write(s, name, strlen(name) + 1);
141 /* should public key encypt the password here */
142 (void) write(s, pass, strlen(pass) + 1);
143 (void) write(s, cmd, strlen(cmd) + 1);
144 if (read(s, &c, 1) != 1) {
145 perror(*ahost);
146 goto bad;
148 if (c != 0) {
149 while (read(s, &c, 1) == 1) {
150 (void) write(2, &c, 1);
151 if (c == '\n')
152 break;
154 goto bad;
156 return (s);
157 bad:
158 if (port)
159 (void) close(*fd2p);
160 (void) close(s);
161 return (-1);