21 TAILQ_HEAD(lm_list, lm);
25 TAILQ_ENTRY(lm) lm_link;
28 TAILQ_HEAD(lmp_list, lmp) lmp_head = TAILQ_HEAD_INITIALIZER(lmp_head);
31 enum { T_EXACT=0, T_BASENAME, T_DIRECTORY } type;
33 TAILQ_ENTRY(lmp) lmp_link;
36 static TAILQ_HEAD(lmc_list, lmc) lmc_head = TAILQ_HEAD_INITIALIZER(lmc_head);
39 TAILQ_ENTRY(lmc) next;
44 static void lmc_parse(char *, size_t);
45 static void lmc_parse_file(char *);
46 static void lmc_parse_dir(char *);
47 static void lm_add(const char *, const char *, const char *);
48 static void lm_free(struct lm_list *);
49 static char *lml_find(struct lm_list *, const char *);
50 static struct lm_list *lmp_find(const char *);
51 static struct lm_list *lmp_init(char *);
52 static const char *quickbasename(const char *);
54 #define iseol(c) (((c) == '#') || ((c) == '\0') || \
55 ((c) == '\n') || ((c) == '\r'))
58 * Do not use ctype.h macros, which rely on working TLS. It is
59 * too early to have thread-local variables functional.
61 #define rtld_isspace(c) ((c) == ' ' || (c) == '\t')
64 lm_init(char *libmap_override)
68 dbg("lm_init(\"%s\")", libmap_override);
69 TAILQ_INIT(&lmp_head);
71 lmc_parse_file(ld_path_libmap_conf);
73 if (libmap_override) {
75 * Do some character replacement to make $LDLIBMAP look
76 * like a text file, then parse it.
78 libmap_override = xstrdup(libmap_override);
79 for (p = libmap_override; *p; p++) {
89 lmc_parse(libmap_override, p - libmap_override);
90 free(libmap_override);
93 return (lm_count == 0);
97 lmc_parse_file(char *path)
105 rpath = realpath(path, NULL);
109 TAILQ_FOREACH(p, &lmc_head, next) {
110 if (strcmp(p->path, rpath) == 0) {
116 fd = open(rpath, O_RDONLY | O_CLOEXEC);
118 dbg("lm_parse_file: open(\"%s\") failed, %s", rpath,
119 rtld_strerror(errno));
123 if (fstat(fd, &st) == -1) {
125 dbg("lm_parse_file: fstat(\"%s\") failed, %s", rpath,
126 rtld_strerror(errno));
130 lm_map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
131 if (lm_map == (const char *)MAP_FAILED) {
133 dbg("lm_parse_file: mmap(\"%s\") failed, %s", rpath,
134 rtld_strerror(errno));
139 p = xmalloc(sizeof(struct lmc));
141 TAILQ_INSERT_HEAD(&lmc_head, p, next);
142 lmc_parse(lm_map, st.st_size);
143 munmap(lm_map, st.st_size);
147 lmc_parse_dir(char *idir)
152 char conffile[MAXPATHLEN];
156 rpath = realpath(idir, NULL);
160 TAILQ_FOREACH(p, &lmc_head, next) {
161 if (strcmp(p->path, rpath) == 0) {
172 p = xmalloc(sizeof(struct lmc));
174 TAILQ_INSERT_HEAD(&lmc_head, p, next);
176 while ((dp = readdir(d)) != NULL) {
179 if (dp->d_type != DT_REG)
181 ext = strrchr(dp->d_name, '.');
184 if (strcmp(ext, ".conf") != 0)
186 if (strlcpy(conffile, idir, MAXPATHLEN) >= MAXPATHLEN)
187 continue; /* too long */
188 if (strlcat(conffile, "/", MAXPATHLEN) >= MAXPATHLEN)
189 continue; /* too long */
190 if (strlcat(conffile, dp->d_name, MAXPATHLEN) >= MAXPATHLEN)
191 continue; /* too long */
192 lmc_parse_file(conffile);
198 lmc_parse(char *lm_p, size_t lm_len)
200 char *cp, *f, *t, *c, *p;
201 char prog[MAXPATHLEN];
202 /* allow includedir + full length path */
203 char line[MAXPATHLEN + 13];
209 while (cnt < lm_len) {
211 while (cnt < lm_len && lm_p[cnt] != '\n' &&
212 i < sizeof(line) - 1) {
218 while (cnt < lm_len && lm_p[cnt] != '\n')
226 /* Skip over leading space */
227 while (rtld_isspace(*cp)) cp++;
229 /* Found a comment or EOL */
230 if (iseol(*cp)) continue;
232 /* Found a constraint selector */
236 /* Skip leading space */
237 while (rtld_isspace(*cp)) cp++;
239 /* Found comment, EOL or end of selector */
240 if (iseol(*cp) || *cp == ']')
244 /* Skip to end of word */
245 while (!rtld_isspace(*cp) && !iseol(*cp) && *cp != ']')
248 /* Skip and zero out trailing space */
249 while (rtld_isspace(*cp)) *cp++ = '\0';
251 /* Check if there is a closing brace */
252 if (*cp != ']') continue;
254 /* Terminate string if there was no trailing space */
258 * There should be nothing except whitespace or comment
259 from this point to the end of the line.
261 while(rtld_isspace(*cp)) cp++;
262 if (!iseol(*cp)) continue;
264 if (strlcpy(prog, c, sizeof prog) >= sizeof prog)
270 /* Parse the 'from' candidate. */
272 while (!rtld_isspace(*cp) && !iseol(*cp)) cp++;
274 /* Skip and zero out the trailing whitespace */
275 while (rtld_isspace(*cp)) *cp++ = '\0';
277 /* Found a comment or EOL */
278 if (iseol(*cp)) continue;
280 /* Parse 'to' mapping */
282 while (!rtld_isspace(*cp) && !iseol(*cp)) cp++;
284 /* Skip and zero out the trailing whitespace */
285 while (rtld_isspace(*cp)) *cp++ = '\0';
287 /* Should be no extra tokens at this point */
288 if (!iseol(*cp)) continue;
291 if (strcmp(f, "includedir") == 0)
293 else if (strcmp(f, "include") == 0)
301 lm_free (struct lm_list *lml)
305 dbg("%s(%p)", __func__, lml);
307 while (!TAILQ_EMPTY(lml)) {
308 lm = TAILQ_FIRST(lml);
309 TAILQ_REMOVE(lml, lm, lm_link);
323 dbg("%s()", __func__);
325 while (!TAILQ_EMPTY(&lmc_head)) {
326 p = TAILQ_FIRST(&lmc_head);
327 TAILQ_REMOVE(&lmc_head, p, next);
332 while (!TAILQ_EMPTY(&lmp_head)) {
333 lmp = TAILQ_FIRST(&lmp_head);
334 TAILQ_REMOVE(&lmp_head, lmp, lmp_link);
343 lm_add (const char *p, const char *f, const char *t)
351 dbg("%s(\"%s\", \"%s\", \"%s\")", __func__, p, f, t);
353 if ((lml = lmp_find(p)) == NULL)
354 lml = lmp_init(xstrdup(p));
356 lm = xmalloc(sizeof(struct lm));
359 TAILQ_INSERT_HEAD(lml, lm, lm_link);
364 lm_find (const char *p, const char *f)
369 dbg("%s(\"%s\", \"%s\")", __func__, p, f);
371 if (p != NULL && (lml = lmp_find(p)) != NULL) {
372 t = lml_find(lml, f);
375 * Add a global mapping if we have
376 * a successful constrained match.
382 lml = lmp_find("$DEFAULT$");
384 return (lml_find(lml, f));
389 /* Given a libmap translation list and a library name, return the
390 replacement library, or NULL */
392 lm_findn (const char *p, const char *f, const int n)
394 char pathbuf[64], *s, *t;
396 if (n < sizeof(pathbuf) - 1)
409 lml_find (struct lm_list *lmh, const char *f)
413 dbg("%s(%p, \"%s\")", __func__, lmh, f);
415 TAILQ_FOREACH(lm, lmh, lm_link)
416 if (strcmp(f, lm->f) == 0)
421 /* Given an executable name, return a pointer to the translation list or
422 NULL if no matches */
423 static struct lm_list *
424 lmp_find (const char *n)
428 dbg("%s(\"%s\")", __func__, n);
430 TAILQ_FOREACH(lmp, &lmp_head, lmp_link)
431 if ((lmp->type == T_EXACT && strcmp(n, lmp->p) == 0) ||
432 (lmp->type == T_DIRECTORY && strncmp(n, lmp->p, strlen(lmp->p)) == 0) ||
433 (lmp->type == T_BASENAME && strcmp(quickbasename(n), lmp->p) == 0))
438 static struct lm_list *
443 dbg("%s(\"%s\")", __func__, n);
445 lmp = xmalloc(sizeof(struct lmp));
447 if (n[strlen(n)-1] == '/')
448 lmp->type = T_DIRECTORY;
449 else if (strchr(n,'/') == NULL)
450 lmp->type = T_BASENAME;
453 TAILQ_INIT(&lmp->lml);
454 TAILQ_INSERT_HEAD(&lmp_head, lmp, lmp_link);
459 /* libc basename is overkill. Return a pointer to the character after the
460 last /, or the original string if there are no slashes. */
462 quickbasename (const char *path)
464 const char *p = path;
465 for (; *path; path++) {