Commit | Line | Data |
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22e155fc | 1 | /* |
63dd6c18 KB |
2 | * Copyright (c) 1983 The Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
22e155fc DF |
16 | */ |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
63dd6c18 | 20 | "@(#) Copyright (c) 1983 The Regents of the University of California.\n\ |
22e155fc | 21 | All rights reserved.\n"; |
63dd6c18 | 22 | #endif /* not lint */ |
22e155fc | 23 | |
4a31bc6f | 24 | #ifndef lint |
63dd6c18 KB |
25 | static char sccsid[] = "@(#)rsh.c 5.7 (Berkeley) %G%"; |
26 | #endif /* not lint */ | |
4a31bc6f | 27 | |
4a31bc6f BJ |
28 | #include <sys/types.h> |
29 | #include <sys/socket.h> | |
e7d6d17a | 30 | #include <sys/ioctl.h> |
4a31bc6f | 31 | #include <sys/file.h> |
e7d6d17a SL |
32 | |
33 | #include <netinet/in.h> | |
34 | ||
35 | #include <stdio.h> | |
4a31bc6f BJ |
36 | #include <errno.h> |
37 | #include <signal.h> | |
4a31bc6f | 38 | #include <pwd.h> |
e1e93bd3 | 39 | #include <netdb.h> |
4a31bc6f BJ |
40 | |
41 | /* | |
42 | * rsh - remote shell | |
43 | */ | |
44 | /* VARARGS */ | |
45 | int error(); | |
06eef7c4 | 46 | char *index(), *rindex(), *malloc(), *getpass(), *strcpy(); |
4a31bc6f BJ |
47 | |
48 | struct passwd *getpwuid(); | |
49 | ||
50 | int errno; | |
51 | int options; | |
52 | int rfd2; | |
e1f4a31c | 53 | int nflag; |
4a31bc6f BJ |
54 | int sendsig(); |
55 | ||
4ca10280 SL |
56 | #define mask(s) (1 << ((s) - 1)) |
57 | ||
4a31bc6f BJ |
58 | main(argc, argv0) |
59 | int argc; | |
60 | char **argv0; | |
61 | { | |
62 | int rem, pid; | |
63 | char *host, *cp, **ap, buf[BUFSIZ], *args, **argv = argv0, *user = 0; | |
64 | register int cc; | |
65 | int asrsh = 0; | |
66 | struct passwd *pwd; | |
67 | int readfrom, ready; | |
68 | int one = 1; | |
e1e93bd3 | 69 | struct servent *sp; |
4ca10280 | 70 | int omask; |
4a31bc6f BJ |
71 | |
72 | host = rindex(argv[0], '/'); | |
73 | if (host) | |
74 | host++; | |
75 | else | |
76 | host = argv[0]; | |
77 | argv++, --argc; | |
78 | if (!strcmp(host, "rsh")) { | |
79 | host = *argv++, --argc; | |
80 | asrsh = 1; | |
81 | } | |
82 | another: | |
4659bf8e | 83 | if (argc > 0 && !strcmp(*argv, "-l")) { |
4a31bc6f BJ |
84 | argv++, argc--; |
85 | if (argc > 0) | |
86 | user = *argv++, argc--; | |
87 | goto another; | |
88 | } | |
4659bf8e | 89 | if (argc > 0 && !strcmp(*argv, "-n")) { |
4a31bc6f | 90 | argv++, argc--; |
e1f4a31c | 91 | nflag++; |
4a31bc6f BJ |
92 | goto another; |
93 | } | |
4659bf8e | 94 | if (argc > 0 && !strcmp(*argv, "-d")) { |
4a31bc6f BJ |
95 | argv++, argc--; |
96 | options |= SO_DEBUG; | |
97 | goto another; | |
98 | } | |
0f09f657 | 99 | /* |
eeb173b2 | 100 | * Ignore the -L, -w, -e and -8 flags to allow aliases with rlogin |
0f09f657 | 101 | * to work |
eeb173b2 JB |
102 | * |
103 | * There must be a better way to do this! -jmb | |
0f09f657 | 104 | */ |
eeb173b2 JB |
105 | if (argc > 0 && !strncmp(*argv, "-L", 2)) { |
106 | argv++, argc--; | |
107 | goto another; | |
108 | } | |
3c1108f1 JB |
109 | if (argc > 0 && !strncmp(*argv, "-w", 2)) { |
110 | argv++, argc--; | |
111 | goto another; | |
112 | } | |
4659bf8e | 113 | if (argc > 0 && !strncmp(*argv, "-e", 2)) { |
0f09f657 CL |
114 | argv++, argc--; |
115 | goto another; | |
116 | } | |
63556828 JL |
117 | if (argc > 0 && !strncmp(*argv, "-8", 2)) { |
118 | argv++, argc--; | |
119 | goto another; | |
120 | } | |
4a31bc6f BJ |
121 | if (host == 0) |
122 | goto usage; | |
123 | if (argv[0] == 0) { | |
124 | if (asrsh) | |
125 | *argv0 = "rlogin"; | |
126 | execv("/usr/ucb/rlogin", argv0); | |
127 | perror("/usr/ucb/rlogin"); | |
128 | exit(1); | |
129 | } | |
130 | pwd = getpwuid(getuid()); | |
131 | if (pwd == 0) { | |
132 | fprintf(stderr, "who are you?\n"); | |
133 | exit(1); | |
134 | } | |
135 | cc = 0; | |
136 | for (ap = argv; *ap; ap++) | |
137 | cc += strlen(*ap) + 1; | |
138 | cp = args = malloc(cc); | |
139 | for (ap = argv; *ap; ap++) { | |
140 | (void) strcpy(cp, *ap); | |
141 | while (*cp) | |
142 | cp++; | |
143 | if (ap[1]) | |
144 | *cp++ = ' '; | |
145 | } | |
e1e93bd3 SL |
146 | sp = getservbyname("shell", "tcp"); |
147 | if (sp == 0) { | |
148 | fprintf(stderr, "rsh: shell/tcp: unknown service\n"); | |
149 | exit(1); | |
150 | } | |
151 | rem = rcmd(&host, sp->s_port, pwd->pw_name, | |
4a31bc6f BJ |
152 | user ? user : pwd->pw_name, args, &rfd2); |
153 | if (rem < 0) | |
154 | exit(1); | |
30b254da SL |
155 | if (rfd2 < 0) { |
156 | fprintf(stderr, "rsh: can't establish stderr\n"); | |
157 | exit(2); | |
158 | } | |
159 | if (options & SO_DEBUG) { | |
0975b26d | 160 | if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof (one)) < 0) |
30b254da | 161 | perror("setsockopt (stdin)"); |
0975b26d | 162 | if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one, sizeof (one)) < 0) |
30b254da SL |
163 | perror("setsockopt (stderr)"); |
164 | } | |
4a31bc6f | 165 | (void) setuid(getuid()); |
4ca10280 | 166 | omask = sigblock(mask(SIGINT)|mask(SIGQUIT)|mask(SIGTERM)); |
4db732ec JB |
167 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
168 | signal(SIGINT, sendsig); | |
169 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
170 | signal(SIGQUIT, sendsig); | |
171 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
172 | signal(SIGTERM, sendsig); | |
e1f4a31c MK |
173 | if (nflag == 0) { |
174 | pid = fork(); | |
175 | if (pid < 0) { | |
176 | perror("fork"); | |
177 | exit(1); | |
178 | } | |
179 | } | |
4a31bc6f BJ |
180 | ioctl(rfd2, FIONBIO, &one); |
181 | ioctl(rem, FIONBIO, &one); | |
e1f4a31c | 182 | if (nflag == 0 && pid == 0) { |
4a31bc6f BJ |
183 | char *bp; int rembits, wc; |
184 | (void) close(rfd2); | |
185 | reread: | |
420d8a52 | 186 | errno = 0; |
4a31bc6f BJ |
187 | cc = read(0, buf, sizeof buf); |
188 | if (cc <= 0) | |
189 | goto done; | |
190 | bp = buf; | |
191 | rewrite: | |
192 | rembits = 1<<rem; | |
e7d6d17a SL |
193 | if (select(16, 0, &rembits, 0, 0) < 0) { |
194 | if (errno != EINTR) { | |
195 | perror("select"); | |
196 | exit(1); | |
197 | } | |
198 | goto rewrite; | |
199 | } | |
4a31bc6f BJ |
200 | if ((rembits & (1<<rem)) == 0) |
201 | goto rewrite; | |
202 | wc = write(rem, bp, cc); | |
203 | if (wc < 0) { | |
204 | if (errno == EWOULDBLOCK) | |
205 | goto rewrite; | |
206 | goto done; | |
207 | } | |
208 | cc -= wc; bp += wc; | |
209 | if (cc == 0) | |
210 | goto reread; | |
211 | goto rewrite; | |
212 | done: | |
420d8a52 | 213 | (void) shutdown(rem, 1); |
4a31bc6f BJ |
214 | exit(0); |
215 | } | |
4ca10280 | 216 | sigsetmask(omask); |
4a31bc6f BJ |
217 | readfrom = (1<<rfd2) | (1<<rem); |
218 | do { | |
219 | ready = readfrom; | |
e7d6d17a SL |
220 | if (select(16, &ready, 0, 0, 0) < 0) { |
221 | if (errno != EINTR) { | |
222 | perror("select"); | |
223 | exit(1); | |
224 | } | |
225 | continue; | |
226 | } | |
4a31bc6f BJ |
227 | if (ready & (1<<rfd2)) { |
228 | errno = 0; | |
229 | cc = read(rfd2, buf, sizeof buf); | |
230 | if (cc <= 0) { | |
231 | if (errno != EWOULDBLOCK) | |
232 | readfrom &= ~(1<<rfd2); | |
233 | } else | |
234 | (void) write(2, buf, cc); | |
235 | } | |
236 | if (ready & (1<<rem)) { | |
237 | errno = 0; | |
238 | cc = read(rem, buf, sizeof buf); | |
239 | if (cc <= 0) { | |
240 | if (errno != EWOULDBLOCK) | |
241 | readfrom &= ~(1<<rem); | |
242 | } else | |
243 | (void) write(1, buf, cc); | |
244 | } | |
245 | } while (readfrom); | |
e1f4a31c MK |
246 | if (nflag == 0) |
247 | (void) kill(pid, SIGKILL); | |
4a31bc6f BJ |
248 | exit(0); |
249 | usage: | |
250 | fprintf(stderr, | |
ff712929 | 251 | "usage: rsh host [ -l login ] [ -n ] command\n"); |
4a31bc6f BJ |
252 | exit(1); |
253 | } | |
254 | ||
4a31bc6f | 255 | sendsig(signo) |
8842c908 | 256 | char signo; |
4a31bc6f BJ |
257 | { |
258 | ||
8842c908 | 259 | (void) write(rfd2, &signo, 1); |
4a31bc6f | 260 | } |