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67 lines
1.6 KiB
67 lines
1.6 KiB
6 years ago
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#include <litc.h>
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static int lstn(uint16_t lport)
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{
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fprintf(stderr, "rshd listening on port %d\n", (int)lport);
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int s = socket(AF_INET, SOCK_STREAM, 0);
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if (s == -1)
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err(-1, "socket");
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struct sockaddr_in sin;
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sin.sin_family = AF_INET;
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sin.sin_port = htons(lport);
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sin.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) == -1)
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err(-1, "bind");
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if (listen(s, 10) == -1)
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err(-1, "listen");
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return s;
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}
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int main(int argc, char **argv)
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{
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int lfd = lstn(22);
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for (;;) {
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struct sockaddr_in sin;
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socklen_t slen = sizeof(sin);
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int s;
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if ((s = accept(lfd, (struct sockaddr *)&sin, &slen)) == -1)
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err(-1, "accept");
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pid_t p;
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if ((p = fork()) == -1)
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err(-1, "fork");
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if (p == 0) {
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if (dup2(s, 0) == -1)
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err(-1, "dup2");
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if (dup2(s, 1) == -1)
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err(-1, "dup2");
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if (dup2(s, 2) == -1)
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err(-1, "dup2");
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close(s);
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char *args[] = {"/bin/lsh", NULL};
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execv(args[0], args);
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err(-1, "execv");
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}
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if (close(s) == -1)
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err(-1, "close");
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uint a = (sin.sin_addr.s_addr >> 0) & 0xff;
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uint b = (sin.sin_addr.s_addr >> 8) & 0xff;
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uint c = (sin.sin_addr.s_addr >> 16) & 0xff;
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uint d = (sin.sin_addr.s_addr >> 24) & 0xff;
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printf("%u.%u.%u.%u:%d connected (pid %ld).\n", a, b, c, d,
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(int)ntohs(sin.sin_port), (long)p);
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pid_t chald;
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int status;
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while ((chald = wait4(WAIT_ANY, &status, WNOHANG, NULL)) > 0)
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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printf("pid %ld terminated abnormally\n",
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chald);
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else
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printf("pid %ld finished\n", chald);
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if (chald == -1 && errno != ECHILD)
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err(-1, "wait4");
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}
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return 0;
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}
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