Commit | Line | Data |
---|---|---|
4a31bc6f | 1 | #ifndef lint |
e7d6d17a | 2 | static char sccsid[] = "@(#)rsh.c 4.2 82/11/14"; |
4a31bc6f BJ |
3 | #endif |
4 | ||
4a31bc6f BJ |
5 | #include <sys/types.h> |
6 | #include <sys/socket.h> | |
e7d6d17a | 7 | #include <sys/ioctl.h> |
4a31bc6f | 8 | #include <sys/file.h> |
e7d6d17a SL |
9 | |
10 | #include <netinet/in.h> | |
11 | ||
12 | #include <stdio.h> | |
4a31bc6f BJ |
13 | #include <errno.h> |
14 | #include <signal.h> | |
4a31bc6f BJ |
15 | #include <pwd.h> |
16 | ||
17 | /* | |
18 | * rsh - remote shell | |
19 | */ | |
20 | /* VARARGS */ | |
21 | int error(); | |
22 | char *index(), *rindex(), *malloc(), *getpass(), *sprintf(), *strcpy(); | |
23 | ||
24 | struct passwd *getpwuid(); | |
25 | ||
26 | int errno; | |
27 | int options; | |
28 | int rfd2; | |
29 | int sendsig(); | |
30 | ||
31 | main(argc, argv0) | |
32 | int argc; | |
33 | char **argv0; | |
34 | { | |
35 | int rem, pid; | |
36 | char *host, *cp, **ap, buf[BUFSIZ], *args, **argv = argv0, *user = 0; | |
37 | register int cc; | |
38 | int asrsh = 0; | |
39 | struct passwd *pwd; | |
40 | int readfrom, ready; | |
41 | int one = 1; | |
42 | ||
43 | host = rindex(argv[0], '/'); | |
44 | if (host) | |
45 | host++; | |
46 | else | |
47 | host = argv[0]; | |
48 | argv++, --argc; | |
49 | if (!strcmp(host, "rsh")) { | |
50 | host = *argv++, --argc; | |
51 | asrsh = 1; | |
52 | } | |
53 | another: | |
54 | if (!strcmp(*argv, "-l")) { | |
55 | argv++, argc--; | |
56 | if (argc > 0) | |
57 | user = *argv++, argc--; | |
58 | goto another; | |
59 | } | |
60 | if (!strcmp(*argv, "-n")) { | |
61 | argv++, argc--; | |
62 | (void) close(0); | |
63 | (void) open("/dev/null", 0); | |
64 | goto another; | |
65 | } | |
66 | if (!strcmp(*argv, "-d")) { | |
67 | argv++, argc--; | |
68 | options |= SO_DEBUG; | |
69 | goto another; | |
70 | } | |
71 | if (host == 0) | |
72 | goto usage; | |
73 | if (argv[0] == 0) { | |
74 | if (asrsh) | |
75 | *argv0 = "rlogin"; | |
76 | execv("/usr/ucb/rlogin", argv0); | |
77 | perror("/usr/ucb/rlogin"); | |
78 | exit(1); | |
79 | } | |
80 | pwd = getpwuid(getuid()); | |
81 | if (pwd == 0) { | |
82 | fprintf(stderr, "who are you?\n"); | |
83 | exit(1); | |
84 | } | |
85 | cc = 0; | |
86 | for (ap = argv; *ap; ap++) | |
87 | cc += strlen(*ap) + 1; | |
88 | cp = args = malloc(cc); | |
89 | for (ap = argv; *ap; ap++) { | |
90 | (void) strcpy(cp, *ap); | |
91 | while (*cp) | |
92 | cp++; | |
93 | if (ap[1]) | |
94 | *cp++ = ' '; | |
95 | } | |
96 | rem = rcmd(&host, IPPORT_CMDSERVER, pwd->pw_name, | |
97 | user ? user : pwd->pw_name, args, &rfd2); | |
98 | if (rem < 0) | |
99 | exit(1); | |
100 | (void) setuid(getuid()); | |
101 | sigacts(SIG_HOLD); | |
102 | pid = fork(); | |
103 | if (pid < 0) { | |
104 | perror("fork"); | |
105 | exit(1); | |
106 | } | |
107 | ioctl(rfd2, FIONBIO, &one); | |
108 | ioctl(rem, FIONBIO, &one); | |
109 | if (pid == 0) { | |
110 | char *bp; int rembits, wc; | |
111 | (void) close(rfd2); | |
112 | reread: | |
113 | cc = read(0, buf, sizeof buf); | |
114 | if (cc <= 0) | |
115 | goto done; | |
116 | bp = buf; | |
117 | rewrite: | |
118 | rembits = 1<<rem; | |
e7d6d17a SL |
119 | if (select(16, 0, &rembits, 0, 0) < 0) { |
120 | if (errno != EINTR) { | |
121 | perror("select"); | |
122 | exit(1); | |
123 | } | |
124 | goto rewrite; | |
125 | } | |
4a31bc6f BJ |
126 | if ((rembits & (1<<rem)) == 0) |
127 | goto rewrite; | |
128 | wc = write(rem, bp, cc); | |
129 | if (wc < 0) { | |
130 | if (errno == EWOULDBLOCK) | |
131 | goto rewrite; | |
132 | goto done; | |
133 | } | |
134 | cc -= wc; bp += wc; | |
135 | if (cc == 0) | |
136 | goto reread; | |
137 | goto rewrite; | |
138 | done: | |
139 | { int flags = 1; ioctl(rem, SIOCDONE, &flags); } | |
140 | exit(0); | |
141 | } | |
142 | sigacts(sendsig); | |
143 | readfrom = (1<<rfd2) | (1<<rem); | |
144 | do { | |
145 | ready = readfrom; | |
e7d6d17a SL |
146 | if (select(16, &ready, 0, 0, 0) < 0) { |
147 | if (errno != EINTR) { | |
148 | perror("select"); | |
149 | exit(1); | |
150 | } | |
151 | continue; | |
152 | } | |
4a31bc6f BJ |
153 | if (ready & (1<<rfd2)) { |
154 | errno = 0; | |
155 | cc = read(rfd2, buf, sizeof buf); | |
156 | if (cc <= 0) { | |
157 | if (errno != EWOULDBLOCK) | |
158 | readfrom &= ~(1<<rfd2); | |
159 | } else | |
160 | (void) write(2, buf, cc); | |
161 | } | |
162 | if (ready & (1<<rem)) { | |
163 | errno = 0; | |
164 | cc = read(rem, buf, sizeof buf); | |
165 | if (cc <= 0) { | |
166 | if (errno != EWOULDBLOCK) | |
167 | readfrom &= ~(1<<rem); | |
168 | } else | |
169 | (void) write(1, buf, cc); | |
170 | } | |
171 | } while (readfrom); | |
172 | (void) kill(pid, SIGKILL); | |
173 | exit(0); | |
174 | usage: | |
175 | fprintf(stderr, | |
176 | "usage: rsh host [ -l login ] [ -p passwd ] command\n"); | |
177 | exit(1); | |
178 | } | |
179 | ||
180 | sigacts(state) | |
181 | int (*state)(); | |
182 | { | |
183 | ||
184 | sigset(SIGINT, state); | |
185 | sigset(SIGQUIT, state); | |
186 | sigset(SIGTERM, state); | |
187 | } | |
188 | ||
189 | sendsig(signo) | |
190 | int signo; | |
191 | { | |
192 | ||
193 | (void) write(rfd2, (char *)&signo, 1); | |
194 | } |