3 * Routines to parse an inetd.conf or tlid.conf file. This would be a great
4 * job for a PERL script.
6 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
10 static char sccsid[] = "@(#) inetcf.c 1.7 97/02/12 02:13:23";
13 #include <sys/types.h>
21 extern char *malloc();
27 * Network configuration files may live in unusual places. Here are some
28 * guesses. Shorter names follow longer ones.
30 char *inet_files[] = {
31 "/private/etc/inetd.conf", /* NEXT */
32 "/etc/inet/inetd.conf", /* SYSV4 */
33 "/usr/etc/inetd.conf", /* IRIX?? */
34 "/etc/inetd.conf", /* BSD */
35 "/etc/net/tlid.conf", /* SYSV4?? */
36 "/etc/saf/tlid.conf", /* SYSV4?? */
37 "/etc/tlid.conf", /* SYSV4?? */
41 static void inet_chk();
42 static char *base_name();
45 * Structure with everything we know about a service.
48 struct inet_ent *next;
53 static struct inet_ent *inet_list = 0;
55 static char whitespace[] = " \t\r\n";
57 /* inet_conf - read in and examine inetd.conf (or tlid.conf) entries */
70 struct tcpd_context saved_context;
75 saved_context = tcpd_context;
78 * The inetd.conf (or tlid.conf) information is so useful that we insist
79 * on its availability. When no file is given run a series of educated
83 if ((fp = fopen(conf, "r")) == 0) {
84 fprintf(stderr, percent_m(buf, "open %s: %m\n"), conf);
88 for (i = 0; inet_files[i] && (fp = fopen(inet_files[i], "r")) == 0; i++)
91 fprintf(stderr, "Cannot find your inetd.conf or tlid.conf file.\n");
92 fprintf(stderr, "Please specify its location.\n");
96 check_path(conf, &st);
100 * Process the file. After the 7.0 wrapper release it became clear that
101 * there are many more inetd.conf formats than the 8 systems that I had
102 * studied. EP/IX uses a two-line specification for rpc services; HP-UX
103 * permits long lines to be broken with backslash-newline.
105 tcpd_context.file = conf;
106 tcpd_context.line = 0;
107 while (xgets(buf, sizeof(buf), fp)) {
108 service = strtok(buf, whitespace); /* service */
109 if (service == 0 || *service == '#')
111 if (STR_NE(service, "stream") && STR_NE(service, "dgram"))
112 strtok((char *) 0, whitespace); /* endpoint */
113 protocol = strtok((char *) 0, whitespace);
114 (void) strtok((char *) 0, whitespace); /* wait */
115 if ((user = strtok((char *) 0, whitespace)) == 0)
117 if (user[0] == '/') { /* user */
120 if ((path = strtok((char *) 0, whitespace)) == 0)
123 if (path[0] == '?') /* IRIX optional service */
125 if (STR_EQ(path, "internal"))
127 if (path[strspn(path, "-0123456789")] == 0) {
130 * ConvexOS puts RPC version numbers before path names. Jukka
131 * Ukkonen <ukkonen@csc.fi>.
133 if ((path = strtok((char *) 0, whitespace)) == 0)
136 if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
137 tcpd_warn("incomplete line");
140 if (arg0[strspn(arg0, "0123456789")] == 0) {
143 * We're reading a tlid.conf file, the format is:
145 * ...stuff... path arg_count arguments mod_count modules
147 if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
148 tcpd_warn("incomplete line");
152 if ((arg1 = strtok((char *) 0, whitespace)) == 0)
155 inet_chk(protocol, path, arg0, arg1);
158 tcpd_context = saved_context;
162 /* inet_chk - examine one inetd.conf (tlid.conf?) entry */
164 static void inet_chk(protocol, path, arg0, arg1)
172 int wrap_status = WR_MAYBE;
173 char *base_name_path = base_name(path);
174 char *tcpd_proc_name = (arg0[0] == '/' ? base_name(arg0) : arg0);
177 * Always warn when the executable does not exist or when it is not
180 if (check_path(path, &st) < 0) {
181 tcpd_warn("%s: not found: %m", path);
182 } else if ((st.st_mode & 0100) == 0) {
183 tcpd_warn("%s: not executable", path);
187 * Cheat on the miscd tests, nobody uses it anymore.
189 if (STR_EQ(base_name_path, "miscd")) {
190 inet_set(arg0, WR_YES);
195 * While we are here...
197 if (STR_EQ(tcpd_proc_name, "rexd") || STR_EQ(tcpd_proc_name, "rpc.rexd"))
198 tcpd_warn("%s may be an insecure service", tcpd_proc_name);
201 * The tcpd program gets most of the attention.
203 if (STR_EQ(base_name_path, "tcpd")) {
205 if (STR_EQ(tcpd_proc_name, "tcpd"))
206 tcpd_warn("%s is recursively calling itself", tcpd_proc_name);
208 wrap_status = WR_YES;
211 * Check: some sites install the wrapper set-uid.
213 if ((st.st_mode & 06000) != 0)
214 tcpd_warn("%s: file is set-uid or set-gid", path);
217 * Check: some sites insert tcpd in inetd.conf, instead of replacing
218 * the daemon pathname.
220 if (arg0[0] == '/' && STR_EQ(tcpd_proc_name, base_name(arg1)))
221 tcpd_warn("%s inserted before %s", path, arg0);
224 * Check: make sure files exist and are executable. On some systems
225 * the network daemons are set-uid so we cannot complain. Note that
226 * tcpd takes the basename only in case of absolute pathnames.
228 if (arg0[0] == '/') { /* absolute path */
229 if (check_path(arg0, &st) < 0) {
230 tcpd_warn("%s: not found: %m", arg0);
231 } else if ((st.st_mode & 0100) == 0) {
232 tcpd_warn("%s: not executable", arg0);
234 } else { /* look in REAL_DAEMON_DIR */
235 sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
236 if (check_path(daemon, &st) < 0) {
237 tcpd_warn("%s: not found in %s: %m",
238 arg0, REAL_DAEMON_DIR);
239 } else if ((st.st_mode & 0100) == 0) {
240 tcpd_warn("%s: not executable", daemon);
247 * No tcpd program found. Perhaps they used the "simple installation"
248 * recipe. Look for a file with the same basename in REAL_DAEMON_DIR.
249 * Draw some conservative conclusions when a distinct file is found.
251 sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
252 if (STR_EQ(path, daemon)) {
254 wrap_status = WR_MAYBE;
256 wrap_status = WR_NOT;
258 } else if (check_path(daemon, &st) >= 0) {
259 wrap_status = WR_MAYBE;
260 } else if (errno == ENOENT) {
261 wrap_status = WR_NOT;
263 tcpd_warn("%s: file lookup: %m", daemon);
264 wrap_status = WR_MAYBE;
269 * Alas, we cannot wrap rpc/tcp services.
271 if (wrap_status == WR_YES && STR_EQ(protocol, "rpc/tcp"))
272 tcpd_warn("%s: cannot wrap rpc/tcp services", tcpd_proc_name);
274 inet_set(tcpd_proc_name, wrap_status);
277 /* inet_set - remember service status */
279 void inet_set(name, type)
283 struct inet_ent *ip =
284 (struct inet_ent *) malloc(sizeof(struct inet_ent) + strlen(name));
287 fprintf(stderr, "out of memory\n");
290 ip->next = inet_list;
291 strcpy(ip->name, name);
296 /* inet_get - look up service status */
306 for (ip = inet_list; ip; ip = ip->next)
307 if (STR_EQ(ip->name, name))
313 /* base_name - compute last pathname component */
315 static char *base_name(path)
320 if ((cp = strrchr(path, '/')) != 0)