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584efcab CS |
1 | /* IPCop helper program - rebuildhosts |
2 | * | |
3 | * This program is distributed under the terms of the GNU General Public | |
4 | * Licence. See the file COPYING for details. | |
5 | * | |
6 | * (c) Alan Hourihane, 2003 | |
7 | * | |
8 | * | |
9 | * $Id: rebuildhosts.c,v 1.3.2.6 2005/07/11 10:56:47 franck78 Exp $ | |
10 | * | |
11 | */ | |
12 | ||
13 | #include "libsmooth.h" | |
14 | #include <stdio.h> | |
15 | #include <stdlib.h> | |
16 | #include <unistd.h> | |
17 | #include <fcntl.h> | |
18 | #include <string.h> | |
19 | #include <sys/types.h> | |
20 | #include <sys/stat.h> | |
21 | #include <signal.h> | |
22 | #include "setuid.h" | |
23 | ||
24 | FILE *fd = NULL; | |
25 | FILE *hosts = NULL; | |
26 | FILE *gw = NULL; | |
27 | struct keyvalue *kv = NULL; | |
28 | ||
29 | void exithandler(void) | |
30 | { | |
31 | if (kv) | |
32 | freekeyvalues(kv); | |
33 | if (fd) | |
34 | fclose(fd); | |
35 | if (hosts) | |
36 | fclose(hosts); | |
37 | if (gw) | |
38 | fclose(gw); | |
39 | } | |
40 | ||
41 | int main(int argc, char *argv[]) | |
42 | { | |
43 | int fdpid; | |
95c26b24 | 44 | char hostname[STRING_SIZE] = ""; |
584efcab CS |
45 | char domainname[STRING_SIZE] = ""; |
46 | char gateway[STRING_SIZE] = ""; | |
47 | char buffer[STRING_SIZE]; | |
95c26b24 | 48 | char address[STRING_SIZE] = ""; |
584efcab CS |
49 | char *active, *ip, *host, *domain; |
50 | int pid; | |
51 | ||
52 | if (!(initsetuid())) | |
53 | exit(1); | |
54 | ||
55 | atexit(exithandler); | |
56 | ||
57 | memset(buffer, 0, STRING_SIZE); | |
58 | ||
59 | kv = initkeyvalues(); | |
60 | if (!(readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))) | |
61 | { | |
62 | fprintf(stderr, "Couldn't read ethernet settings\n"); | |
63 | exit(1); | |
64 | } | |
65 | findkey(kv, "GREEN_ADDRESS", address); | |
66 | freekeyvalues(kv); | |
67 | ||
68 | kv = initkeyvalues(); | |
69 | if (!(readkeyvalues(kv, CONFIG_ROOT "/main/settings"))) | |
70 | { | |
71 | fprintf(stderr, "Couldn't read main settings\n"); | |
72 | exit(1); | |
73 | } | |
74 | strcpy(hostname, SNAME ); | |
75 | findkey(kv, "HOSTNAME", hostname); | |
76 | findkey(kv, "DOMAINNAME", domainname); | |
77 | freekeyvalues(kv); | |
78 | kv = NULL; | |
79 | ||
80 | if (!(gw = fopen(CONFIG_ROOT "/red/remote-ipaddress", "r"))) | |
81 | { | |
82 | fprintf(stderr, "Couldn't open remote-ipaddress file\n"); | |
83 | fclose(gw); | |
84 | gw = NULL; | |
85 | exit(1); | |
86 | } | |
87 | ||
88 | if (fgets(gateway, STRING_SIZE, gw) == NULL) | |
89 | { | |
90 | fprintf(stderr, "Couldn't read remote-ipaddress\n"); | |
91 | exit(1); | |
92 | } | |
93 | ||
94 | if (!(fd = fopen(CONFIG_ROOT "/main/hosts", "r"))) | |
95 | { | |
96 | fprintf(stderr, "Couldn't open main hosts file\n"); | |
97 | exit(1); | |
98 | } | |
99 | ||
100 | if (!(hosts = fopen("/etc/hosts", "w"))) | |
101 | { | |
102 | fprintf(stderr, "Couldn't open /etc/hosts file\n"); | |
103 | fclose(fd); | |
104 | fd = NULL; | |
105 | exit(1); | |
106 | } | |
107 | fprintf(hosts, "127.0.0.1\tlocalhost\n"); | |
108 | if (strlen(domainname)) | |
109 | fprintf(hosts, "%s\t%s.%s\t%s\n",address,hostname,domainname,hostname); | |
110 | else | |
111 | fprintf(hosts, "%s\t%s\n",address,hostname); | |
112 | ||
113 | fprintf(hosts, "%s\tgateway\n",gateway); | |
114 | ||
115 | while (fgets(buffer, STRING_SIZE, fd)) | |
116 | { | |
117 | buffer[strlen(buffer) - 1] = 0; | |
118 | if (buffer[0]==',') continue; /* disabled if empty field */ | |
119 | active = strtok(buffer, ","); | |
120 | if (strcmp(active, "off")==0) continue; /* or 'off' */ | |
121 | ||
122 | ip = strtok(NULL, ","); | |
123 | host = strtok(NULL, ","); | |
124 | domain = strtok(NULL, ","); | |
125 | ||
126 | if (!(ip && host)) | |
127 | continue; // bad line ? skip | |
128 | ||
129 | if (!VALID_IP(ip)) | |
130 | { | |
131 | fprintf(stderr, "Bad IP: %s\n", ip); | |
132 | continue; /* bad ip, skip */ | |
133 | } | |
134 | ||
135 | if (strspn(host, LETTERS_NUMBERS "-") != strlen(host)) | |
136 | { | |
137 | fprintf(stderr, "Bad Host: %s\n", host); | |
138 | continue; /* bad name, skip */ | |
139 | } | |
140 | ||
141 | if (domain) | |
142 | fprintf(hosts, "%s\t%s.%s\t%s\n",ip,host,domain,host); | |
143 | else | |
144 | fprintf(hosts, "%s\t%s\n",ip,host); | |
145 | } | |
146 | fclose(fd); | |
147 | fd = NULL; | |
148 | fclose(hosts); | |
149 | hosts = NULL; | |
150 | ||
151 | if ((fdpid = open("/var/run/dnsmasq.pid", O_RDONLY)) == -1) | |
152 | { | |
153 | fprintf(stderr, "Couldn't open pid file\n"); | |
154 | exit(1); | |
155 | } | |
156 | if (read(fdpid, buffer, STRING_SIZE - 1) == -1) | |
157 | { | |
158 | fprintf(stderr, "Couldn't read from pid file\n"); | |
159 | close(fdpid); | |
160 | exit(1); | |
161 | } | |
162 | close(fdpid); | |
163 | pid = atoi(buffer); | |
164 | if (pid <= 1) | |
165 | { | |
166 | fprintf(stderr, "Bad pid value\n"); | |
167 | exit(1); | |
168 | } | |
169 | if (kill(pid, SIGHUP) == -1) | |
170 | { | |
171 | fprintf(stderr, "Unable to send SIGHUP\n"); | |
172 | exit(1); | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } |