1: /*************************************************************************
2: * (C) 2011 AITNET - Sofia/Bulgaria - <office@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
6: * $Id: ansh3d.c,v 1.1 2011/10/04 22:37:46 misho Exp $
7: *
8: *************************************************************************/
9: #include "global.h"
10: #include "anshd.h"
11: #include "proc.h"
12:
13:
14: intptr_t Kill;
15: int Verbose, Crypted = 1;
16: proc_head_t pH;
17: int bpfLEN, Timeout, Daemon = 1;
18:
19: extern char compiled[], compiledby[], compilehost[];
20:
21: static void
22: Usage()
23: {
24: printf( " -= anshd =- ELWIX Layer3 remote management service over ICMP\n"
25: "=== %s === %s@%s ===\n\n"
26: " Syntax: ansh3d [options]\n\n"
27: "\t-a <host>\tBind to host address (default is *any*)\n"
28: "\t-i <id>\tService ID (default is 42)\n"
29: "\t-U <user>\tRun service with other user\n"
30: "\t-C <dir>\tRun service into chroot directory\n"
31: "\t-t <timeout>\tTimeout of login if no activity (default is 0 sec)\n"
32: "\t-u\t\tSwitch to unencrypted traffic between hosts\n"
33: "\t-b\t\tRun into batch mode (default is daemon mode)\n"
34: "\t-v\t\tVerbose (more -v, more verbosity ...)\n"
35: "\t-h\t\tThis help screen!\n"
36: "\n", compiled, compiledby, compilehost);
37: }
38:
39: static void
40: sig(int s)
41: {
42: int state;
43:
44: switch (s) {
45: case SIGHUP:
46: VERB(1) LOG("Got SIGHUP!\n");
47: break;
48: case SIGTERM:
49: Kill++;
50: VERB(1) LOG("Got SIGTERM!\n");
51: break;
52: case SIGPIPE:
53: VERB(1) LOG("Got SIGPIPE!\n");
54: break;
55: case SIGCHLD:
56: VERB(1) LOG("Got SIGCHLD!\n");
57: while (waitpid(-1, &state, WNOHANG) > 0);
58: break;
59: }
60: }
61:
62: static void *
63: hook_error(void *root, void *arg)
64: {
65: /* sched_root_task_t *r = root; */
66:
67: if (!root)
68: return (void*) -1;
69:
70: if (arg == (void*) EINTR)
71: return (void*) -1;
72:
73: return NULL;
74: }
75:
76: int
77: main(int argc, char **argv)
78: {
79: struct sockaddr sa = { 0 };
80: struct sockaddr_in *sin4 = (struct sockaddr_in*) &sa;
81: struct sockaddr_in6 *sin6 = (struct sockaddr_in6*) &sa;
82: struct hostent *host;
83: struct passwd *pass;
84: int fd, h = 0, uid = 0, gid = 0;
85: long id = ANSH_ID;
86: char ch, szUser[STRSIZ] = "root", szChroot[STRSIZ] = "/";
87: struct sigaction sact;
88: sched_root_task_t *root = NULL;
89: struct tagProc *proc;
90:
91: while ((ch = getopt(argc, argv, "hvubt:a:i:U:C:")) != -1)
92: switch (ch) {
93: case 'U':
94: pass = getpwnam(optarg);
95: if (!pass) {
96: printf("Error:: User %s not found!\n", optarg);
97: return 1;
98: } else {
99: strlcpy(szUser, optarg, sizeof szUser);
100: uid = pass->pw_uid;
101: gid = pass->pw_gid;
102: }
103: endpwent();
104: break;
105: case 'C':
106: if (access(optarg, R_OK)) {
107: printf("Error:: in chroot %s #%d - %s\n", optarg, errno, strerror(errno));
108: return 1;
109: } else
110: strlcpy(szChroot, optarg, sizeof szChroot);
111: break;
112: case 'i':
113: id = strtol(optarg, NULL, 0);
114: break;
115: case 't':
116: Timeout = abs(strtol(optarg, NULL, 0));
117: break;
118: case 'a':
119: host = gethostbyname(optarg);
120: if (!host) {
121: printf("Error:: in bind address '%s' #%d - %s\n",
122: optarg, h_errno, hstrerror(h_errno));
123: return 1;
124: }
125: switch (host->h_addrtype) {
126: case AF_INET:
127: sin4->sin_len = sizeof(struct sockaddr_in);
128: sin4->sin_family = AF_INET;
129: memcpy(&sin4->sin_addr.s_addr, host->h_addr, host->h_length);
130: break;
131: case AF_INET6:
132: sin6->sin6_len = sizeof(struct sockaddr_in6);
133: sin6->sin6_family = AF_INET6;
134: memcpy(&sin6->sin6_addr.s6_addr, host->h_addr, host->h_length);
135: break;
136: default:
137: printf("Error:: Unknown address type %d !!!\n", host->h_addrtype);
138: return 1;
139: }
140: break;
141: case 'u':
142: Crypted ^= Crypted;
143: break;
144: case 'b':
145: Daemon ^= Daemon;
146: break;
147: case 'v':
148: Verbose++;
149: break;
150: case 'h':
151: default:
152: Usage();
153: return 1;
154: }
155: argc -= optind;
156: argv += optind;
157:
158: /* sanity check for openned descriptor */
159: if (!sa.sa_family) {
160: sin4->sin_len = sizeof(struct sockaddr_in);
161: sin4->sin_family = AF_INET;
162: }
163:
164: /* catch signals */
165: memset(&sact, 0, sizeof sact);
166: sigemptyset(&sact.sa_mask);
167: sact.sa_handler = sig;
168: sigaction(SIGPIPE, &sact, NULL);
169: sigaction(SIGCHLD, &sact, NULL);
170: sigaction(SIGTERM, &sact, NULL);
171: sigaction(SIGHUP, &sact, NULL);
172:
173: openlog("ansh3d", LOG_CONS | LOG_PID, LOG_DAEMON);
174:
175: if (Daemon) {
176: switch (fork()) {
177: case -1:
178: ERR("Daemon mode #%d - %s\n", errno, strerror(errno));
179: closelog();
180: return 1;
181: case 0:
182: VERB(1) LOG("Welcome to dark ...\n");
183:
184: setsid();
185:
186: fd = open("/dev/null", O_WRONLY);
187: if (fd) {
188: dup2(fd, STDIN_FILENO);
189: dup2(fd, STDOUT_FILENO);
190: dup2(fd, STDERR_FILENO);
191: if (fd > 2)
192: close(fd);
193: }
194: break;
195: default:
196: VERB(1) LOG("Going to shadow land ...\n");
197: closelog();
198: return 0;
199: }
200: }
201:
202: if (ioCreatePIDFile(PIDFILE_ANSH3D, 42)) {
203: ERR("Error:: already started ansh3d service ...\n");
204: closelog();
205: return 1;
206: }
207:
208: h = PrepareL3(&sa, &bpfLEN);
209: if (h == -1) {
210: ERR("Error:: Descriptor not opened ... abort!\n");
211: unlink(PIDFILE_ANSH3D);
212: closelog();
213: return 2;
214: }
215:
216: SLIST_INIT(&pH);
217: if (!(proc = InitProc(h, NULL, id, bpfLEN))) {
218: ERR("Error:: Not enough memory ...\n");
219: close(h);
220: unlink(PIDFILE_ANSH3D);
221: closelog();
222: return 3;
223: }
224:
225: root = schedBegin();
226: if (!root) {
227: ERR("Scheduler not init #%d - %s\n", sched_GetErrno(), sched_GetError());
228: DestroyProc(id);
229: close(h);
230: unlink(PIDFILE_ANSH3D);
231: closelog();
232: return 4;
233: } else
234: root->root_hooks.hook_root.error = hook_error;
235:
236: chdir("/");
237: chroot(szChroot);
238:
239: setgid(gid);
240: setuid(uid);
241:
242: if (schedRead(root, icmpRx, (void*) id, h)) {
243: schedRun(root, &Kill);
244: } else
245: ERR("Failed to add reader task #%d - %s\n", sched_GetErrno(), sched_GetError());
246:
247: VERB(1) LOG("Finish process.");
248: schedEnd(&root);
249: DestroyProc(id);
250: close(h);
251: unlink(PIDFILE_ANSH3D);
252: closelog();
253: return 0;
254: }
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