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1.1.2.1 misho 1: /*************************************************************************
2: * (C) 2010 AITNET - Sofia/Bulgaria - <office@aitbg.com>
3: * by Michael Pounov <misho@aitbg.com>
4: *
5: * $Author: misho $
1.1.2.6 ! misho 6: * $Id: wdog.c,v 1.1.2.5 2010/10/18 11:13:50 misho Exp $
1.1.2.1 misho 7: *
8: *************************************************************************/
9: #include "global.h"
10:
11:
1.1.2.2 misho 12: int Verbose, Kill;
1.1.2.1 misho 13: extern char compiled[], compiledby[], compilehost[];
14:
15:
16: static void
17: Usage()
18: {
19:
20: printf( "WatchDog tool for risk process managment\n"
21: "=== %s === %s@%s ===\n\n"
22: " Syntax: wdog [options] [exec_file]\n\n"
23: "\t-v\t\tVerbose ...\n"
1.1.2.2 misho 24: "\t-c <dir>\tBefore execute chroot to dir [default=/]\n"
1.1.2.3 misho 25: "\t-u <user>\tBefore execute change user\n"
1.1.2.6 ! misho 26: "\t-P\t\tInfinit loop, bypass penalty timeout\n"
1.1.2.1 misho 27: "\n", compiled, compiledby, compilehost);
28: }
29:
1.1.2.2 misho 30: static void
31: sigHand(int sig)
32: {
33: int stat;
34:
35: switch (sig) {
36: case SIGTERM:
37: Kill++;
38: break;
39: case SIGCHLD:
40: while (waitpid(-1, &stat, WNOHANG) > 0);
41: break;
42: }
43: }
44:
1.1.2.1 misho 45:
46: int
47: main(int argc, char **argv)
48: {
1.1.2.6 ! misho 49: char ch, bypass = 0, szChroot[MAXPATHLEN] = "/";
1.1.2.3 misho 50: int status = 0, ret = 1;
1.1.2.2 misho 51: struct sigaction sa;
1.1.2.3 misho 52: struct passwd *pass = NULL;
53: uid_t uid = getuid();
1.1.2.5 misho 54: u_int penalty = 1;
1.1.2.2 misho 55:
1.1.2.6 ! misho 56: while ((ch = getopt(argc, argv, "vhPc:u:")) != -1)
1.1.2.2 misho 57: switch (ch) {
58: case 'v':
59: Verbose++;
60: break;
1.1.2.6 ! misho 61: case 'P':
! 62: bypass = 1;
! 63: break;
1.1.2.2 misho 64: case 'c':
1.1.2.3 misho 65: if (uid) {
66: printf("Error:: can`t chroot, please run as root!\n");
67: goto end;
68: }
1.1.2.2 misho 69: if (access(optarg, R_OK)) {
70: printf("Error:: can`t chroot to %s #%d - %s\n", optarg,
71: errno, strerror(errno));
72: goto end;
73: } else
74: strlcpy(szChroot, optarg, MAXPATHLEN);
1.1.2.3 misho 75: status |= 1;
76: break;
77: case 'u':
78: if (uid) {
79: printf("Error:: can`t setuid, please run as root!\n");
80: goto end;
81: }
82: pass = getpwnam(optarg);
83: if (!pass) {
84: printf("Error:: can`t find user %s\n", optarg);
85: goto end;
86: } else
87: uid = pass->pw_uid;
88: endpwent();
89: status |= 2;
1.1.2.2 misho 90: break;
91: case 'h':
92: default:
93: Usage();
94: goto end;
95: }
96: argc -= optind;
97: argv += optind;
98: if (!argc || !argv || !*argv) {
99: Usage();
100: goto end;
101: } else
1.1.2.4 misho 102: VERB(2) printf("Info:: Chroot=%s Run=%s\n", szChroot, *argv);
1.1.2.2 misho 103:
104: memset(&sa, 0, sizeof sa);
105: sa.sa_handler = sigHand;
106: sigemptyset(&sa.sa_mask);
107: sigaction(SIGTERM, &sa, NULL);
108: sigaction(SIGCHLD, &sa, NULL);
109: sa.sa_handler = SIG_IGN;
110: sigaction(SIGHUP, &sa, NULL);
111: sigaction(SIGINT, &sa, NULL);
112: sigaction(SIGQUIT, &sa, NULL);
113: sigaction(SIGPIPE, &sa, NULL);
114: sigaction(SIGTSTP, &sa, NULL);
115: sigaction(SIGSTOP, &sa, NULL);
116: VERB(5) printf("Info:: Catched signals ...\n");
117:
1.1.2.3 misho 118: if (status & 1 && (ret = chroot(szChroot)) == -1) {
1.1.2.2 misho 119: printf("Error:: error in chroot to %s #%d - %s\n", szChroot, errno, strerror(errno));
120: ret = 3;
121: goto end;
122: } else
123: VERB(1) printf("Info:: chrooted to %s\n", szChroot);
124:
1.1.2.3 misho 125: if (status & 2 && setuid(uid) == -1) {
126: printf("Error:: error in setuid to %u #%d - %s\n", uid, errno, strerror(errno));
127: ret = 4;
128: goto end;
129: } else
130: VERB(1) printf("Info:: setuid to %u\n", uid);
131:
1.1.2.4 misho 132: status ^= status;
1.1.2.5 misho 133: while (!Kill && penalty) {
1.1.2.2 misho 134: switch ((ret = fork())) {
135: case -1:
136: printf("Error:: error in fork #%d - %s\n", errno, strerror(errno));
1.1.2.3 misho 137: ret = 5;
1.1.2.2 misho 138: goto end;
139: case 0:
1.1.2.4 misho 140: VERB(3) printf("Info:: I`m child of shadows ...\n");
141: if (execvp(*argv, argv) == -1) {
142: printf("Error:: error in exec %s #%d - %s\n",
143: *argv, errno, strerror(errno));
144: ret = 6;
145: goto end;
146: }
1.1.2.5 misho 147: /* never reached !!! */
1.1.2.2 misho 148: break;
149: default:
1.1.2.4 misho 150: wait(&status);
151: kill(ret, SIGTERM);
152: ret = status;
1.1.2.2 misho 153: }
1.1.2.5 misho 154: /* penalty timeout retry */
155: usleep(penalty);
1.1.2.6 ! misho 156: if (!bypass) {
! 157: penalty <<= 1;
! 158: VERB(2) printf("Info:: penalty timeout %u microseconds\n", penalty);
! 159: }
1.1.2.5 misho 160: }
161: if (!penalty)
162: ret = 9;
1.1.2.2 misho 163: end:
164: return ret;
1.1.2.1 misho 165: }