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37 * @(#)conf.c 8.2 (Berkeley) 3/27/94
39 * $FreeBSD: src/sbin/mount_portal/conf.c,v 1.8 1999/08/28 00:13:35 peter Exp $
40 * $DragonFly: src/sbin/mount_portal/conf.c,v 1.2 2003/06/17 04:27:33 dillon Exp $
50 #include <sys/types.h>
51 #include <sys/param.h>
52 #include <sys/syslog.h>
56 #define ALLOC(ty) (xmalloc(sizeof(ty)))
58 typedef struct path path;
60 qelem p_q; /* 2-way linked list */
61 int p_lno; /* Line number of this record */
62 char *p_args; /* copy of arg string (malloc) */
63 char *p_key; /* Pathname to match (also p_argv[0]) */
64 regex_t p_rx; /* RE to match against pathname () */
65 int p_rxvalid; /* non-zero if valid regular expression */
66 int p_argc; /* number of elements in arg string */
67 char **p_argv; /* argv[] pointers into arg string (malloc) */
70 static char *conf_file; /* XXX for regerror */
71 static path *curp; /* XXX for regerror */
74 * Add an element to a 2-way list,
77 static void ins_que(elem, pred)
80 qelem *p = pred->q_forw;
88 * Remove an element from a 2-way list
90 static void rem_que(elem)
93 qelem *p = elem->q_forw;
94 qelem *p2 = elem->q_back;
100 * Error checking malloc
102 static void *xmalloc(siz)
105 void *p = malloc(siz);
108 syslog(LOG_ALERT, "malloc: failed to get %d bytes", siz);
113 * Insert the path in the list.
114 * If there is already an element with the same key then
115 * the *second* one is ignored (return 0). If the key is
116 * not found then the path is added to the end of the list
119 static int pinsert(p0, q0)
128 for (q = q0->q_forw; q != q0; q = q->q_forw) {
129 path *p = (path *) q;
130 if (strcmp(p->p_key, p0->p_key) == 0)
133 ins_que(&p0->p_q, q0->q_back);
138 static path *palloc(cline, lno)
149 * Implement comment chars
151 s = strchr(cline, '#');
156 * Do a pass through the string to count the number
161 for (s = key; s != NULL; ) {
163 while ((val = strsep(&s, " \t\n")) != NULL && *val == '\0')
175 * Now do another pass and generate a new path structure
179 p->p_argv = xmalloc(c * sizeof(char *));
180 p->p_args = strdup(cline);
182 for (s = p->p_args; s != NULL; ) {
184 while ((val = strsep(&s, " \t\n")) != NULL && *val == '\0')
194 for (c = 0; c < p->p_argc; c++)
195 printf("%sv[%d] = %s\n", c?"\t":"", c, p->p_argv[c]);
198 p->p_key = p->p_argv[0];
199 if (strpbrk(p->p_key, RE_CHARS)) {
203 val = regcomp(&p->p_rx, p->p_key, REG_EXTENDED | REG_NOSUB);
205 char errbuf[_POSIX2_LINE_MAX];
206 regerror(val, &p->p_rx, errbuf, sizeof errbuf);
207 syslog(LOG_ERR, "%s:%d: regcomp %s: %s",
208 conf_file, curp->p_lno, curp->p_key, errbuf);
224 * Free a path structure
233 free((char *) p->p_argv);
238 * Discard all currently held path structures on q0.
239 * and add all the ones on xq.
241 static void preplace(q0, xq)
246 * While the list is not empty,
247 * take the first element off the list
250 while (q0->q_forw != q0) {
251 qelem *q = q0->q_forw;
255 while (xq->q_forw != xq) {
256 qelem *q = xq->q_forw;
263 * Read the lines from the configuration file and
264 * add them to the list of paths.
266 static void readfp(q0, fp)
270 char cline[LINE_MAX];
275 * Make a new empty list.
277 q.q_forw = q.q_back = &q;
280 * Read the lines from the configuration file.
282 while (fgets(cline, sizeof(cline), fp)) {
283 path *p = palloc(cline, nread+1);
284 if (p && !pinsert(p, &q))
290 * If some records were read, then throw
291 * away the old list and replace with the
299 * Read the configuration file (conf) and replace
300 * the existing path list with the new version.
301 * If the file is not readable, then no changes take place
303 void conf_read(q, conf)
307 FILE *fp = fopen(conf, "r");
309 conf_file = conf; /* XXX */
311 conf_file = 0; /* XXX */
314 syslog(LOG_ERR, "open config file \"%s\": %s", conf, strerror(errno));
319 char **conf_match(q0, key)
325 for (q = q0->q_forw; q != q0; q = q->q_forw) {
326 path *p = (path *) q;
328 if (!regexec(&p->p_rx, key, 0, 0, 0)) {
329 return p->p_argv + 1;
332 if (strncmp(p->p_key, key, strlen(p->p_key)) == 0)
333 return (p->p_argv+1);