Annotation of embedaddon/ipguard/ipguard.c, revision 1.1.1.1
1.1 misho 1: /* ipguard.c
2: *
3: * Copyright (c) 2010 SeaD <sead at deep.perm.ru>
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17: * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24: * SUCH DAMAGE.
25: *
26: * $Id: ipguard.c,v 1.18 2010/07/12 03:46:36 sead Exp $
27: *
28: */
29:
30: #include "ipguard.h"
31:
32: void usage(char *name) {
33: fprintf(stdout, "%s v%s (c) %s <%s>\n\n", NAME, VERSION, AUTHOR, MAIL);
34: fprintf(stdout, "usage: %s [-h] [-ajgrxziovd]\n", name);
35: fprintf(stdout, " [-f ethers] [-l log] [-p pid] [-m mac] [-c filter] [-u seconds] [-k seconds]\n");
36: fprintf(stdout, " [-n fakes] [-t mseconds] [-b buf] [-s user] <iface>\n\n");
37: }
38:
39: void help(void) {
40: fprintf(stdout, "available options:\n");
41: fprintf(stdout, " -f | -e <ethers> ethers file (" ETHERSFILE ")\n");
42: fprintf(stdout, " -l <log> log file (" LOGNAME "_<iface>.log)\n");
43: fprintf(stdout, " -p <pid> pid file (" PIDNAME "_<iface>.pid)\n");
44: fprintf(stdout, " -m <mac> fake mac (" FAKEMAC ")\n");
45: fprintf(stdout, " -c <filter> pcap expression (none)\n");
46: fprintf(stdout, " -u <seconds> update ethers interval (%d)\n", ETHERSTO);
47: fprintf(stdout, " -k <seconds> fake regenerate time (%d)\n", FAKEREGEN);
48: fprintf(stdout, " -n <fakes> fake replies number (%d)\n", FAKENUM);
49: fprintf(stdout, " -t <mseconds> time between fakes (%d)\n", FAKETIME);
50: fprintf(stdout, " -b <buf> mac-ip buffer size (%d)\n", BUFSIZE);
51: fprintf(stdout, " -s <user> set user (none)\n");
52: fprintf(stdout, " -a no address substitution\n");
53: fprintf(stdout, " -j disable first mac-ip\n");
54: fprintf(stdout, " -g default to grant\n");
55: fprintf(stdout, " -r read only\n");
56: fprintf(stdout, " -x duplex mode\n");
57: fprintf(stdout, " -z fix by broadcast\n");
58: fprintf(stdout, " -i hidden mode\n");
59: fprintf(stdout, " -o promiscuous mode\n");
60: fprintf(stdout, " -v be verbose\n");
61: fprintf(stdout, " -d[d[d]] don't fork [debug [more]]\n");
62: fprintf(stdout, " -h this help\n");
63: }
64:
65: int main(int argc, char *argv[]) {
66: extern char *optarg;
67: extern int optind;
68: int n;
69:
70: if (getuid()) {
71: fprintf(stderr, "error: must be run as root to init libnet\n");
72: exit(EXIT_FAILURE);
73: }
74:
75: srand((unsigned int) getpid());
76:
77: iface[0] = fmac[0] = pfmac[0] = pcapf[0] = log_name[0] = pid_name[0] = suser[0] = '\0';
78: strncpy(ethers_name, ETHERSFILE, PATH_MAX);
79: strncpy(fmac, FAKEMAC, 18);
80: ethers_update = ETHERSTO;
81: fake_regen = FAKEREGEN;
82: fake_num = FAKENUM;
83: fake_time = FAKETIME;
84: buffer_num = BUFSIZE;
85: addr_nosubst = nofirst = grant = read_only = duplex = fixbc = hidden =
86: promisc = debug = verbose = 0;
87:
88: all = good = grat = wgrat = zmac = zip = bad = bmac = bsip =
89: btip = bnew = bgrat = mymac = fake = pfake = nzh = nbe = mis = 0;
90:
91: /* Still unused letters: q:w:y and all of figures ;)
92: */
93:
94: while ((n = getopt(argc, argv, "f:e:l:p:m:c:s:u:k:n:t:b:ajgrxziovdh")) != EOF) {
95: switch (n) {
96: case 'f':
97: case 'e': strncpy(ethers_name, optarg, PATH_MAX); break;
98: case 'l': strncpy(log_name, optarg, PATH_MAX); break;
99: case 'p': strncpy(pid_name, optarg, PATH_MAX); break;
100: case 'm': strncpy(fmac, optarg, 18); break;
101: case 'c': strncpy(pcapf, optarg, PCAPFSIZ); break;
102: case 's': strncpy(suser, optarg, MAXLOGNAME); break;
103: case 'u': ethers_update = atoi(optarg); break;
104: case 'k': fake_regen = atoi(optarg); break;
105: case 'n': fake_num = atoi(optarg); break;
106: case 't': fake_time = atoi(optarg); break;
107: case 'b': buffer_num = atoi(optarg); break;
108: case 'a': addr_nosubst++; break;
109: case 'j': nofirst++; break;
110: case 'g': grant++; break;
111: case 'r': read_only++; break;
112: case 'x': duplex++; break;
113: case 'z': fixbc++; break;
114: case 'i': hidden++; break;
115: case 'o': promisc++; break;
116: case 'v': verbose++; break;
117: case 'd': debug++; break;
118: case 'h': usage(argv[0]); help(); exit(EXIT_SUCCESS);
119: default: usage(argv[0]); exit(EXIT_FAILURE);
120: }
121: }
122: if (argc > optind) { strncpy(iface, argv[optind], IFNAMSIZ); }
123: else { usage(argv[0]); exit(EXIT_FAILURE); }
124:
125: if (!log_name[0]) snprintf(log_name, PATH_MAX, "%s_%s.log", LOGNAME, iface);
126: if (!pid_name[0]) snprintf(pid_name, PATH_MAX, "%s_%s.pid", PIDNAME, iface);
127:
128: if (!pcapf[0]) strncpy(pcapf, "arp", 3);
129: else { pcapf[PCAPFSIZ-10] = '\0'; strncat(pcapf, " and arp", 8); }
130:
131: log_open();
132:
133: if (verbose) { log_str(NOTICE, "Starting", argv[0]); }
134:
135: if (debug > 1) {
136: fprintf(stderr, "PARAMS:");
137: for (n = 1; n < argc; n++) fprintf(stderr, " %s", argv[n]);
138: fprintf(stderr, "\n");
139: fprintf(stderr, "PCAP FILTER: %s\n", pcapf);
140: }
141:
142: if (!debug) daemonize();
143: pid_creat();
144: packet_init(iface);
145: if (suser[0]) set_user();
146: sig_init();
147:
148: while (1) packet_recv();
149:
150: exit_ipguard(EXIT_SUCCESS);
151: return 0;
152: }
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