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Initial revision

    1: /*************************************************************************
    2:  * (C) 2011 AITNET - Sofia/Bulgaria - <office@aitnet.org>
    3:  *  by Michael Pounov <misho@elwix.org>
    4:  *
    5:  * $Author: misho $
    6:  * $Id: anshd.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 bpfLEN, Verbose, Crypted = 1;
   16: proc_head_t pH;
   17: int Daemon = 1;
   18: 
   19: extern char compiled[], compiledby[], compilehost[];
   20: 
   21: static void
   22: Usage()
   23: {
   24: 	printf(	" -= anshd =- ELWIX Layer2 remote management service\n"
   25: 		"=== %s === %s@%s ===\n\n"
   26: 		" Syntax: anshd [options]\n\n"
   27: 		"\t-d <dev>\tBind to host interface, like 'em0' (default is first host interface)\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-u\t\tSwitch to unencrypted traffic between hosts\n"
   32: 		"\t-b\t\tRun into batch mode (default is daemon mode)\n"
   33: 		"\t-v\t\tVerbose (more -v, more verbosity ...)\n"
   34: 		"\t-h\t\tThis help screen!\n"
   35: 		"\n", compiled, compiledby, compilehost);
   36: }
   37: 
   38: static void
   39: sig(int s)
   40: {
   41: 	int state;
   42: 
   43: 	switch (s) {
   44: 		case SIGHUP:
   45: 			LOG("Got SIGHUP!\n");
   46: 			break;
   47: 		case SIGTERM:
   48: 			LOG("Got SIGTERM!\n");
   49: 			Kill++;
   50: 			break;
   51: 		case SIGPIPE:
   52: 			LOG("Got SIGPIPE!\n");
   53: 			break;
   54: 		case SIGCHLD:
   55: 			while (waitpid(-1, &state, WNOHANG) > 0);
   56: 			break;
   57: 	}
   58: }
   59: 
   60: int
   61: main(int argc, char **argv)
   62: {
   63: 	struct passwd *pass;
   64: 	int fd, h = 0, uid = 0, gid = 0;
   65: 	long id = ANSH_ID;
   66: 	char ch, szUser[STRSIZ] = "root", szChroot[STRSIZ] = "/", szDev[STRSIZ] = { 0 };
   67: 	struct sigaction sact;
   68: 	sched_root_task_t *root = NULL;
   69: 	struct tagProc *proc;
   70: 
   71: 	Get1stEth(szDev, STRSIZ);
   72: 
   73: 	while ((ch = getopt(argc, argv, "hvulbd:U:C:")) != -1)
   74: 		switch (ch) {
   75: 			case 'U':
   76: 				pass = getpwnam(optarg);
   77: 				if (!pass) {
   78: 					printf("Error:: User %s not found!\n", optarg);
   79: 					return 1;
   80: 				} else {
   81: 					strlcpy(szUser, optarg, sizeof szUser);
   82: 					uid = pass->pw_uid;
   83: 					gid = pass->pw_gid;
   84: 				}
   85: 				endpwent();
   86: 				break;
   87: 			case 'C':
   88: 				if (access(optarg, R_OK)) {
   89: 					printf("Error:: in chroot %s #%d - %s\n", optarg, errno, strerror(errno));
   90: 					return 1;
   91: 				} else
   92: 					strlcpy(szChroot, optarg, sizeof szChroot);
   93: 				break;
   94: 			case 'i':
   95: 				id = strtol(optarg, NULL, 0);
   96: 				break;
   97: 			case 'd':
   98: 				strlcpy(szDev, optarg, sizeof szDev);
   99: 				break;
  100: 			case 'u':
  101: 				Crypted ^= Crypted;
  102: 				break;
  103: 			case 'b':
  104: 				Daemon ^= Daemon;
  105: 				break;
  106: 			case 'v':
  107: 				Verbose++;
  108: 				break;
  109: 			case 'h':
  110: 			default:
  111: 				Usage();
  112: 				return 1;
  113: 		}
  114: 	argc -= optind;
  115: 	argv += optind;
  116: 
  117: 	/* catch signals */
  118: 	memset(&sact, 0, sizeof sact);
  119: 	sigemptyset(&sact.sa_mask);
  120: 	sact.sa_handler = sig;
  121: 	sigaction(SIGPIPE, &sact, NULL);
  122: 	sigaction(SIGCHLD, &sact, NULL);
  123: 	sigaction(SIGTERM, &sact, NULL);
  124: 	sigaction(SIGHUP, &sact, NULL);
  125: 
  126: 	openlog("anshd", LOG_CONS | LOG_PID, LOG_DAEMON);
  127: 
  128: 	if (Daemon) {
  129: 		switch (fork()) {
  130: 			case -1:
  131: 				ERR("Daemon mode #%d - %s\n", errno, strerror(errno));
  132: 				closelog();
  133: 				return 1;
  134: 			case 0:
  135: 				VERB(1) LOG("Welcome to dark ...\n");
  136: 
  137: 				setsid();
  138: 
  139: 				fd = open("/dev/null", O_WRONLY);
  140: 				if (fd) {
  141: 					dup2(fd, STDIN_FILENO);
  142: 					dup2(fd, STDOUT_FILENO);
  143: 					dup2(fd, STDERR_FILENO);
  144: 					if (fd > 2)
  145: 						close(fd);
  146: 				}
  147: 				break;
  148: 			default:
  149: 				VERB(1) LOG("Going to shadow land ...\n");
  150: 				closelog();
  151: 				return 0;
  152: 		}
  153: 	}
  154: 
  155: 	h = PrepareL2(szDev, &bpfLEN);
  156: 	if (h == -1) {
  157: 		ERR("Error:: Descriptor not opened ... abort!\n");
  158: 		closelog();
  159: 		return 2;
  160: 	}
  161: 
  162: 	SLIST_INIT(&pH);
  163: 	if (!(proc = InitProc(h, NULL, id, bpfLEN))) {
  164: 		ERR("Error:: Not enough memory ...\n");
  165: 		close(h);
  166: 		closelog();
  167: 		return 3;
  168: 	}
  169: 
  170: 	root = schedBegin();
  171: 	if (!root) {
  172: 		ERR("Scheduler not init #%d - %s\n", sched_GetErrno(), sched_GetError());
  173: 		DestroyProc(id);
  174: 		close(h);
  175: 		closelog();
  176: 		return 4;
  177: 	}
  178: 
  179: 	chdir("/");
  180: 	chroot(szChroot);
  181: 
  182: 	setgid(gid);
  183: 	setuid(uid);
  184: 
  185: 	if (schedRead(root, pktRx, (void*) id, h)) {
  186: 		schedRun(root, &Kill);
  187: 	} else
  188: 		ERR("Failed to add reader task #%d - %s\n", sched_GetErrno(), sched_GetError());
  189: 
  190: 	VERB(1) LOG("Finish process.");
  191: 	schedEnd(&root);
  192: 	DestroyProc(id);
  193: 	close(h);
  194: 	closelog();
  195: 	return 0;
  196: }