1 /*
2 * Routines for testing only. Not really industrial strength.
3 *
4 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
5 */
6
7 #ifndef lint
8 static char sccs_id[] = "@(#) scaffold.c 1.6 97/03/21 19:27:24";
9 #endif
10
11 /* System libraries. */
12
13 #include <sys/types.h>
14 #include <sys/stat.h>
15 #include <sys/socket.h>
16 #include <netinet/in.h>
17 #include <arpa/inet.h>
18 #include <netdb.h>
19 #include <stdio.h>
20 #include <syslog.h>
21 #include <setjmp.h>
22 #include <string.h>
23
24 #ifndef INADDR_NONE
25 #define INADDR_NONE (-1) /* XXX should be 0xffffffff */
26 #endif
27
28 extern char *malloc();
29
30 /* Application-specific. */
31
32 #include "tcpd.h"
33 #include "scaffold.h"
34
35 /*
36 * These are referenced by the options module and by rfc931.c.
37 */
38 int allow_severity = SEVERITY;
39 int deny_severity = LOG_WARNING;
40 int rfc931_timeout = RFC931_TIMEOUT;
41
42 /* dup_hostent - create hostent in one memory block */
43
dup_hostent(hp)44 static struct hostent *dup_hostent(hp)
45 struct hostent *hp;
46 {
47 struct hostent_block {
48 struct hostent host;
49 char *addr_list[1];
50 };
51 struct hostent_block *hb;
52 int count;
53 char *data;
54 char *addr;
55
56 for (count = 0; hp->h_addr_list[count] != 0; count++)
57 /* void */ ;
58
59 if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block)
60 + (hp->h_length + sizeof(char *)) * count)) == 0) {
61 fprintf(stderr, "Sorry, out of memory\n");
62 exit(1);
63 }
64 memset((char *) &hb->host, 0, sizeof(hb->host));
65 hb->host.h_addrtype = hp->h_addrtype;;
66 hb->host.h_length = hp->h_length;
67 hb->host.h_addr_list = hb->addr_list;
68 hb->host.h_addr_list[count] = 0;
69 data = (char *) (hb->host.h_addr_list + count + 1);
70
71 for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
72 hb->host.h_addr_list[count] = data + hp->h_length * count;
73 memcpy(hb->host.h_addr_list[count], addr, hp->h_length);
74 }
75 return (&hb->host);
76 }
77
78 /* find_inet_addr - find all addresses for this host, result to free() */
79
find_inet_addr(host)80 struct hostent *find_inet_addr(host)
81 char *host;
82 {
83 union gen_addr addr;
84 struct hostent *hp;
85 static struct hostent h;
86 static char *addr_list[2];
87
88 /*
89 * Host address: translate it to internal form.
90 */
91 if (numeric_addr(host, &addr, &h.h_addrtype, &h.h_length) != -1) {
92 h.h_addr_list = addr_list;
93 h.h_addr_list[0] = (char *) &addr;
94 return (dup_hostent(&h));
95 }
96
97 /*
98 * Map host name to a series of addresses. Watch out for non-internet
99 * forms or aliases. The NOT_INADDR() is here in case gethostbyname() has
100 * been "enhanced" to accept numeric addresses. Make a copy of the
101 * address list so that later gethostbyXXX() calls will not clobber it.
102 */
103 if (NOT_INADDR(host) == 0) {
104 tcpd_warn("%s: not an internet address", host);
105 return (0);
106 }
107 if ((hp = tcpd_gethostbyname(host, 0)) == 0) {
108 tcpd_warn("%s: host not found", host);
109 return (0);
110 }
111 if (!VALID_ADDRTYPE(hp->h_addrtype)) {
112 tcpd_warn("%d: not an internet host", hp->h_addrtype);
113 return (0);
114 }
115 if (STR_NE(host, hp->h_name)) {
116 tcpd_warn("%s: hostname alias", host);
117 tcpd_warn("(official name: %.*s)", STRING_LENGTH, hp->h_name);
118 }
119 return (dup_hostent(hp));
120 }
121
122 /* check_dns - give each address thorough workout, return address count */
123
check_dns(host)124 int check_dns(host)
125 char *host;
126 {
127 struct request_info request;
128 struct sockaddr_gen sin;
129 struct hostent *hp;
130 int count;
131 char *addr;
132
133 if ((hp = find_inet_addr(host)) == 0)
134 return (0);
135 request_init(&request, RQ_CLIENT_SIN, &sin, 0);
136 sock_methods(&request);
137 memset((char *) &sin, 0, sizeof(sin));
138 sin.sg_family = hp->h_addrtype;
139
140 for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
141 memcpy((char *) SGADDRP(&sin), addr, SGADDRSZ(&sin));
142
143 /*
144 * Force host name and address conversions. Use the request structure
145 * as a cache. Detect hostname lookup problems. Any name/name or
146 * name/address conflicts will be reported while eval_hostname() does
147 * its job.
148 */
149 request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0);
150 if (STR_EQ(eval_hostname(request.client), unknown))
151 tcpd_warn("host address %s->name lookup failed",
152 eval_hostaddr(request.client));
153 }
154 free((char *) hp);
155 return (count);
156 }
157
158 /* dummy function to intercept the real shell_cmd() */
159
160 /* ARGSUSED */
161
shell_cmd(command)162 void shell_cmd(command)
163 char *command;
164 {
165 if (hosts_access_verbose)
166 printf("command: %s", command);
167 }
168
169 /* dummy function to intercept the real clean_exit() */
170
171 /* ARGSUSED */
172
clean_exit(request)173 void clean_exit(request)
174 struct request_info *request;
175 {
176 exit(0);
177 }
178
179 /* dummy function to intercept the real rfc931() */
180
181 /* ARGSUSED */
182
rfc931(request)183 void rfc931(request)
184 struct request_info *request;
185 {
186 strcpy(request->user, unknown);
187 }
188
189 /* check_path - examine accessibility */
190
check_path(path,st)191 int check_path(path, st)
192 char *path;
193 struct stat *st;
194 {
195 struct stat stbuf;
196 char buf[BUFSIZ];
197
198 if (stat(path, st) < 0)
199 return (-1);
200 #ifdef notdef
201 if (st->st_uid != 0)
202 tcpd_warn("%s: not owned by root", path);
203 if (st->st_mode & 020)
204 tcpd_warn("%s: group writable", path);
205 #endif
206 if (st->st_mode & 002)
207 tcpd_warn("%s: world writable", path);
208 if (path[0] == '/' && path[1] != 0) {
209 strrchr(strcpy(buf, path), '/')[0] = 0;
210 (void) check_path(buf[0] ? buf : "/", &stbuf);
211 }
212 return (0);
213 }
214