1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1999 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35 #include <myrcmd.h>
36 #include <limits.h>
37 #include <stdio.h>
38 #include <string.h>
39 #include <pwd.h>
40 #include <errno.h>
41 #include <unistd.h>
42 #include <sys/types.h>
43 #include <sys/file.h>
44 #include <signal.h>
45 #include <sys/socket.h>
46
47 #include <netinet/in.h>
48 #include <arpa/inet.h>
49
50 #include <netdb.h>
51 #include <fcntl.h>
52 #include <libintl.h>
53
54 #include <memutils.h>
55
56 #define index(s, c) strchr(s, c)
57 char *strchr();
58
59 char *inet_ntoa();
60
61 char myrcmd_stderr[1024];
62
63 int
myrcmd(char ** ahost,unsigned short rport,char * locuser,char * remuser,char * cmd)64 myrcmd(char **ahost, unsigned short rport, char *locuser, char *remuser,
65 char *cmd)
66 {
67 uint_t loclen, remlen, cmdlen;
68 int s, timo, retval;
69 int tries = 0;
70 pid_t pid;
71 struct sockaddr_in sin;
72 char c;
73 int lport;
74 int saverr;
75 struct hostent *hp;
76 sigset_t oldmask;
77 sigset_t newmask;
78 struct sigaction oldaction;
79 struct sigaction newaction;
80 static struct hostent numhp;
81 static char numhostname[32]; /* big enough for "255.255.255.255" */
82 struct in_addr numaddr;
83 struct in_addr *numaddrlist[2];
84
85 myrcmd_stderr[0] = '\0'; /* empty error string */
86 pid = getpid();
87 hp = gethostbyname(*ahost);
88 if (hp == 0) {
89 char *straddr;
90
91 bzero((char *)numaddrlist, sizeof (numaddrlist));
92 if ((numaddr.s_addr = inet_addr(*ahost)) == (in_addr_t)-1) {
93 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
94 gettext("%s: unknown host\n"), *ahost);
95 return (MYRCMD_NOHOST);
96 } else {
97 bzero((char *)&numhp, sizeof (numhp));
98 bzero(numhostname, sizeof (numhostname));
99
100 if ((straddr = inet_ntoa(numaddr)) == (char *)0) {
101 (void) snprintf(myrcmd_stderr,
102 sizeof (myrcmd_stderr),
103 gettext("%s: unknown host\n"), *ahost);
104 return (MYRCMD_NOHOST);
105 }
106 (void) strncpy(numhostname, straddr,
107 sizeof (numhostname));
108 numhostname[sizeof (numhostname) - 1] = '\0';
109 numhp.h_name = numhostname;
110 numhp.h_addrtype = AF_INET;
111 numhp.h_length = sizeof (numaddr);
112 numaddrlist[0] = &numaddr;
113 numaddrlist[1] = NULL;
114 numhp.h_addr_list = (char **)numaddrlist;
115 hp = &numhp;
116 }
117 }
118 *ahost = hp->h_name;
119
120 /* This provides a bounds-test for the bcopy()s below. */
121 if ((unsigned)(hp->h_length) > sizeof (sin.sin_addr)) {
122 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
123 gettext("rcmd: address size: %d larger than limit %d\n"),
124 hp->h_length, sizeof (sin.sin_addr));
125 return (MYRCMD_EBAD);
126 }
127
128 /* ignore SIGPIPE */
129 bzero((char *)&newaction, sizeof (newaction));
130 newaction.sa_handler = SIG_IGN;
131 newaction.sa_flags = SA_ONSTACK;
132 (void) sigaction(SIGPIPE, &newaction, &oldaction);
133
134 /* block SIGURG */
135 bzero((char *)&newmask, sizeof (newmask));
136 (void) sigaddset(&newmask, SIGURG);
137 (void) sigprocmask(SIG_BLOCK, &newmask, &oldmask);
138 again:
139 timo = 1;
140 /*
141 * Use 0 as lport means that rresvport() will bind to a port in
142 * the anonymous priviledged port range.
143 */
144 lport = 0;
145 for (;;) {
146 s = rresvport(&lport);
147 if (s < 0) {
148 int err;
149
150 if (errno == EAGAIN) {
151 (void) snprintf(myrcmd_stderr,
152 sizeof (myrcmd_stderr),
153 gettext("socket: All ports in use\n"));
154 err = MYRCMD_ENOPORT;
155 } else {
156 saverr = errno;
157 (void) snprintf(myrcmd_stderr,
158 sizeof (myrcmd_stderr),
159 gettext("rcmd: socket: %s\n"),
160 strerror(saverr));
161 err = MYRCMD_ENOSOCK;
162 }
163 /* restore original SIGPIPE handler */
164 (void) sigaction(SIGPIPE, &oldaction,
165 (struct sigaction *)0);
166
167 /* restore original signal mask */
168 (void) sigprocmask(SIG_SETMASK, &oldmask,
169 (sigset_t *)0);
170 return (err);
171 }
172 /* Can't fail, according to fcntl(2) */
173 (void) fcntl(s, F_SETOWN, pid);
174 sin.sin_family = hp->h_addrtype;
175 bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
176 sin.sin_port = rport;
177 if (connect(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
178 break;
179 saverr = errno;
180 (void) close(s);
181 if (saverr == EADDRINUSE) {
182 continue;
183 }
184 if (saverr == ECONNREFUSED && timo <= 16) {
185 sleep(timo);
186 timo *= 2;
187 continue;
188 }
189 if (hp->h_addr_list[1] != NULL) {
190 saverr = errno;
191
192 fprintf(stderr,
193 gettext("connect to address %s: "),
194 inet_ntoa(sin.sin_addr));
195 errno = saverr;
196 perror(0);
197 hp->h_addr_list++;
198 bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr,
199 hp->h_length);
200 fprintf(stderr, gettext("Trying %s...\n"),
201 inet_ntoa(sin.sin_addr));
202 continue;
203 }
204 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
205 "%s: %s\n", hp->h_name, strerror(saverr));
206 /* restore original SIGPIPE handler */
207 (void) sigaction(SIGPIPE, &oldaction,
208 (struct sigaction *)0);
209
210 /* restore original signal mask */
211 (void) sigprocmask(SIG_SETMASK, &oldmask, (sigset_t *)0);
212 return (MYRCMD_ENOCONNECT);
213 }
214 if (write(s, "", 1) < 0) {
215 (void) close(s);
216 return (MYRCMD_ENOCONNECT);
217 }
218
219 loclen = strlen(locuser) + 1;
220 remlen = strlen(remuser) + 1;
221 cmdlen = strlen(cmd) + 1;
222
223 if (((retval = write(s, locuser, loclen)) != loclen) ||
224 ((retval = write(s, remuser, remlen)) != remlen) ||
225 ((retval = write(s, cmd, cmdlen)) != cmdlen)) {
226 if (retval == -1)
227 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
228 "write: %s\n", strerror(errno));
229 else
230 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
231 gettext("write unexpectedly truncated\n"));
232 goto bad;
233 }
234 retval = read(s, &c, 1);
235 if (retval != 1) {
236 if (retval == 0) {
237 /*
238 * Solaris 2.0 bug alert. Sometimes, if the
239 * tapehost is a Solaris 2.0 system, the connection
240 * will be dropped at this point. Let's try again,
241 * three times, before we throw in the towel.
242 */
243 if (++tries < 3) {
244 (void) close(s);
245 goto again;
246 }
247 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
248 gettext("Protocol error, %s closed connection\n"),
249 *ahost);
250 } else if (retval < 0) {
251 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
252 "%s: %s\n", *ahost, strerror(errno));
253 } else {
254 (void) snprintf(myrcmd_stderr, sizeof (myrcmd_stderr),
255 gettext("Protocol error, %s sent %d bytes\n"),
256 *ahost, retval);
257 }
258 goto bad;
259 }
260 if (c != 0) {
261 char *cp = myrcmd_stderr;
262 char *ecp = &myrcmd_stderr[sizeof (myrcmd_stderr) - 1];
263
264 while (read(s, &c, 1) == 1) {
265 *cp++ = c;
266 if (c == '\n' || cp >= ecp)
267 break;
268 }
269 *cp = '\0';
270 goto bad;
271 }
272 /* restore original SIGPIPE handler */
273 (void) sigaction(SIGPIPE, &oldaction, (struct sigaction *)0);
274
275 /* restore original signal mask */
276 (void) sigprocmask(SIG_SETMASK, &oldmask, (sigset_t *)0);
277 return (s);
278 bad:
279 (void) close(s);
280 /* restore original SIGPIPE handler */
281 (void) sigaction(SIGPIPE, &oldaction, (struct sigaction *)0);
282
283 /* restore original signal mask */
284 (void) sigprocmask(SIG_SETMASK, &oldmask, (sigset_t *)0);
285 return (MYRCMD_EBAD);
286 }
287