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/*
* $FreeBSD$
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/queue.h>
#include <sys/param.h>
#include "debug.h"
#include "rtld.h"
#include "libmap.h"
#ifndef _PATH_LIBMAP_CONF
#define _PATH_LIBMAP_CONF "/etc/libmap.conf"
#endif
TAILQ_HEAD(lm_list, lm);
struct lm {
char *f;
char *t;
TAILQ_ENTRY(lm) lm_link;
};
TAILQ_HEAD(lmp_list, lmp) lmp_head = TAILQ_HEAD_INITIALIZER(lmp_head);
struct lmp {
char *p;
struct lm_list lml;
TAILQ_ENTRY(lmp) lmp_link;
};
static void lm_add (const char *, const char *, const char *);
static void lm_free (struct lm_list *);
static char * lml_find (struct lm_list *, const char *);
static struct lm_list * lmp_find (const char *);
static struct lm_list * lmp_init (char *);
#define iseol(c) (((c) == '#') || ((c) == '\0') || \
((c) == '\n') || ((c) == '\r'))
void
lm_init (void)
{
FILE *fp;
char *cp;
char *f, *t, *p, *c;
char prog[MAXPATHLEN];
char line[MAXPATHLEN + 2];
dbg("%s()", __func__);
TAILQ_INIT(&lmp_head);
if ((fp = fopen(_PATH_LIBMAP_CONF, "r")) == NULL)
return;
p = NULL;
while ((cp = fgets(line, MAXPATHLEN + 1, fp)) != NULL) {
t = f = c = NULL;
/* Skip over leading space */
while (isspace(*cp)) cp++;
/* Found a comment or EOL */
if (iseol(*cp)) continue;
/* Found a constraint selector */
if (*cp == '[') {
cp++;
/* Skip leading space */
while (isspace(*cp)) cp++;
/* Found comment, EOL or end of selector */
if (iseol(*cp) || *cp == ']')
continue;
c = cp++;
/* Skip to end of word */
while (!isspace(*cp) && !iseol(*cp) && *cp != ']')
cp++;
/* Skip and zero out trailing space */
while (isspace(*cp)) *cp++ = '\0';
/* Check if there is a closing brace */
if (*cp != ']') continue;
/* Terminate string if there was no trailing space */
*cp++ = '\0';
/*
* There should be nothing except whitespace or comment
from this point to the end of the line.
*/
while(isspace(*cp)) *cp++;
if (!iseol(*cp)) continue;
strcpy(prog, c);
p = prog;
continue;
}
/* Parse the 'from' candidate. */
f = cp++;
while (!isspace(*cp) && !iseol(*cp)) cp++;
/* Skip and zero out the trailing whitespace */
while (isspace(*cp)) *cp++ = '\0';
/* Found a comment or EOL */
if (iseol(*cp)) continue;
/* Parse 'to' mapping */
t = cp++;
while (!isspace(*cp) && !iseol(*cp)) cp++;
/* Skip and zero out the trailing whitespace */
while (isspace(*cp)) *cp++ = '\0';
/* Should be no extra tokens at this point */
if (!iseol(*cp)) continue;
*cp = '\0';
lm_add(p, f, t);
}
fclose(fp);
return;
}
static void
lm_free (struct lm_list *lml)
{
struct lm *lm;
dbg("%s(%p)", __func__, lml);
while (!TAILQ_EMPTY(lml)) {
lm = TAILQ_FIRST(lml);
TAILQ_REMOVE(lml, lm, lm_link);
free(lm->f);
free(lm->t);
free(lm);
}
return;
}
void
lm_fini (void)
{
struct lmp *lmp;
dbg("%s()", __func__);
while (!TAILQ_EMPTY(&lmp_head)) {
lmp = TAILQ_FIRST(&lmp_head);
TAILQ_REMOVE(&lmp_head, lmp, lmp_link);
free(lmp->p);
lm_free(&lmp->lml);
free(lmp);
}
return;
}
static void
lm_add (const char *p, const char *f, const char *t)
{
struct lm_list *lml;
struct lm *lm;
if (p == NULL)
p = "$DEFAULT$";
dbg("%s(\"%s\", \"%s\", \"%s\")", __func__, p, f, t);
if ((lml = lmp_find(p)) == NULL)
lml = lmp_init(xstrdup(p));
lm = xmalloc(sizeof(struct lm));
lm->f = xstrdup(f);
lm->t = xstrdup(t);
TAILQ_INSERT_HEAD(lml, lm, lm_link);
}
char *
lm_find (const char *p, const char *f)
{
struct lm_list *lml;
char *t;
dbg("%s(\"%s\", \"%s\")", __func__, p, f);
if (p != NULL && (lml = lmp_find(p)) != NULL) {
t = lml_find(lml, f);
if (t != NULL) {
/*
* Add a global mapping if we have
* a successful constrained match.
*/
lm_add(NULL, f, t);
return (t);
}
}
lml = lmp_find("$DEFAULT$");
if (lml != NULL)
return (lml_find(lml, f));
else
return (NULL);
}
static char *
lml_find (struct lm_list *lmh, const char *f)
{
struct lm *lm;
dbg("%s(%p, \"%s\")", __func__, lmh, f);
TAILQ_FOREACH(lm, lmh, lm_link)
if ((strncmp(f, lm->f, strlen(lm->f)) == 0) &&
(strlen(f) == strlen(lm->f)))
return (lm->t);
return NULL;
}
static struct lm_list *
lmp_find (const char *n)
{
struct lmp *lmp;
dbg("%s(\"%s\")", __func__, n);
TAILQ_FOREACH(lmp, &lmp_head, lmp_link)
if ((strncmp(n, lmp->p, strlen(lmp->p)) == 0) &&
(strlen(n) == strlen(lmp->p)))
return (&lmp->lml);
return (NULL);
}
static struct lm_list *
lmp_init (char *n)
{
struct lmp *lmp;
dbg("%s(\"%s\")", __func__, n);
lmp = xmalloc(sizeof(struct lmp));
lmp->p = n;
TAILQ_INIT(&lmp->lml);
TAILQ_INSERT_HEAD(&lmp_head, lmp, lmp_link);
return (&lmp->lml);
}
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