2 * Routines for testing only. Not really industrial strength.
4 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
10 static char sccs_id[] = "@(#) scaffold.c 1.6 97/03/21 19:27:24";
13 /* System libraries. */
15 #include <sys/types.h>
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
27 #define INADDR_NONE (-1) /* XXX should be 0xffffffff */
30 /* Application-specific. */
36 * These are referenced by the options module and by rfc931.c.
38 int allow_severity = SEVERITY;
39 int deny_severity = LOG_WARNING;
40 int rfc931_timeout = RFC931_TIMEOUT;
43 /* dup_hostent - create hostent in one memory block */
45 static struct hostent *dup_hostent(hp)
48 struct hostent_block {
52 struct hostent_block *hb;
57 for (count = 0; hp->h_addr_list[count] != 0; count++)
60 if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block)
61 + (hp->h_length + sizeof(char *)) * count)) == 0) {
62 fprintf(stderr, "Sorry, out of memory\n");
65 memset((char *) &hb->host, 0, sizeof(hb->host));
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);
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);
79 /* find_inet_addr - find all addresses for this host, result to free() */
82 struct addrinfo *find_inet_addr(host)
85 struct addrinfo hints, *res;
87 memset(&hints, 0, sizeof(hints));
88 hints.ai_family = PF_UNSPEC;
89 hints.ai_socktype = SOCK_STREAM;
90 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
91 if (getaddrinfo(host, NULL, &hints, &res) == 0)
94 memset(&hints, 0, sizeof(hints));
95 hints.ai_family = PF_UNSPEC;
96 hints.ai_socktype = SOCK_STREAM;
97 hints.ai_flags = AI_PASSIVE | AI_CANONNAME;
98 if (getaddrinfo(host, NULL, &hints, &res) != 0) {
99 tcpd_warn("%s: host not found", host);
102 if (res->ai_family != AF_INET6 && res->ai_family != AF_INET) {
103 tcpd_warn("%d: not an internet host", res->ai_family);
107 if (!res->ai_canonname) {
108 tcpd_warn("%s: hostname alias", host);
109 tcpd_warn("(cannot obtain official name)", res->ai_canonname);
110 } else if (STR_NE(host, res->ai_canonname)) {
111 tcpd_warn("%s: hostname alias", host);
112 tcpd_warn("(official name: %.*s)", STRING_LENGTH, res->ai_canonname);
117 struct hostent *find_inet_addr(host)
122 static struct hostent h;
123 static char *addr_list[2];
126 * Host address: translate it to internal form.
128 if ((addr.s_addr = dot_quad_addr(host)) != INADDR_NONE) {
129 h.h_addr_list = addr_list;
130 h.h_addr_list[0] = (char *) &addr;
131 h.h_length = sizeof(addr);
132 return (dup_hostent(&h));
136 * Map host name to a series of addresses. Watch out for non-internet
137 * forms or aliases. The NOT_INADDR() is here in case gethostbyname() has
138 * been "enhanced" to accept numeric addresses. Make a copy of the
139 * address list so that later gethostbyXXX() calls will not clobber it.
141 if (NOT_INADDR(host) == 0) {
142 tcpd_warn("%s: not an internet address", host);
145 if ((hp = gethostbyname(host)) == 0) {
146 tcpd_warn("%s: host not found", host);
149 if (hp->h_addrtype != AF_INET) {
150 tcpd_warn("%d: not an internet host", hp->h_addrtype);
153 if (STR_NE(host, hp->h_name)) {
154 tcpd_warn("%s: hostname alias", host);
155 tcpd_warn("(official name: %.*s)", STRING_LENGTH, hp->h_name);
157 return (dup_hostent(hp));
161 /* check_dns - give each address thorough workout, return address count */
166 struct request_info request;
168 struct sockaddr_storage sin;
169 struct addrinfo *hp, *res;
171 struct sockaddr_in sin;
177 if ((hp = find_inet_addr(host)) == 0)
179 request_init(&request, RQ_CLIENT_SIN, &sin, 0);
180 sock_methods(&request);
182 memset((char *) &sin, 0, sizeof(sin));
183 sin.sin_family = AF_INET;
187 for (res = hp, count = 0; res; res = res->ai_next, count++) {
188 memcpy(&sin, res->ai_addr, res->ai_addrlen);
190 for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
191 memcpy((char *) &sin.sin_addr, addr, sizeof(sin.sin_addr));
195 * Force host name and address conversions. Use the request structure
196 * as a cache. Detect hostname lookup problems. Any name/name or
197 * name/address conflicts will be reported while eval_hostname() does
200 request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0);
201 if (STR_EQ(eval_hostname(request.client), unknown))
202 tcpd_warn("host address %s->name lookup failed",
203 eval_hostaddr(request.client));
213 /* dummy function to intercept the real shell_cmd() */
217 void shell_cmd(command)
220 if (hosts_access_verbose)
221 printf("command: %s", command);
224 /* dummy function to intercept the real clean_exit() */
228 void clean_exit(request)
229 struct request_info *request;
234 /* check_path - examine accessibility */
236 int check_path(path, st)
243 if (stat(path, st) < 0)
247 tcpd_warn("%s: not owned by root", path);
248 if (st->st_mode & 020)
249 tcpd_warn("%s: group writable", path);
251 if (st->st_mode & 002)
252 tcpd_warn("%s: world writable", path);
253 if (path[0] == '/' && path[1] != 0) {
254 strrchr(strcpy(buf, path), '/')[0] = 0;
255 (void) check_path(buf[0] ? buf : "/", &stbuf);