375 lines
7.1 KiB
C
375 lines
7.1 KiB
C
/*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <stdio.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
|
|
|
|
#ifdef COMPAT_32BIT
|
|
#undef _PATH_LIBMAP_CONF
|
|
#define _PATH_LIBMAP_CONF "/etc/libmap32.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;
|
|
enum { T_EXACT=0, T_BASENAME, T_DIRECTORY } type;
|
|
struct lm_list lml;
|
|
TAILQ_ENTRY(lmp) lmp_link;
|
|
};
|
|
|
|
static int lm_count;
|
|
|
|
static void lmc_parse (FILE *);
|
|
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 *);
|
|
static const char * quickbasename (const char *);
|
|
static int readstrfn (void * cookie, char *buf, int len);
|
|
static int closestrfn (void * cookie);
|
|
|
|
#define iseol(c) (((c) == '#') || ((c) == '\0') || \
|
|
((c) == '\n') || ((c) == '\r'))
|
|
|
|
/*
|
|
* Do not use ctype.h macros, which rely on working TLS. It is
|
|
* too early to have thread-local variables functional.
|
|
*/
|
|
#define rtld_isspace(c) ((c) == ' ' || (c) == '\t')
|
|
|
|
int
|
|
lm_init (char *libmap_override)
|
|
{
|
|
FILE *fp;
|
|
|
|
dbg("%s(\"%s\")", __func__, libmap_override);
|
|
|
|
TAILQ_INIT(&lmp_head);
|
|
|
|
fp = fopen(_PATH_LIBMAP_CONF, "r");
|
|
if (fp) {
|
|
lmc_parse(fp);
|
|
fclose(fp);
|
|
}
|
|
|
|
if (libmap_override) {
|
|
char *p;
|
|
/* do some character replacement to make $LIBMAP look like a
|
|
text file, then "open" it with funopen */
|
|
libmap_override = xstrdup(libmap_override);
|
|
|
|
for (p = libmap_override; *p; p++) {
|
|
switch (*p) {
|
|
case '=':
|
|
*p = ' '; break;
|
|
case ',':
|
|
*p = '\n'; break;
|
|
}
|
|
}
|
|
fp = funopen(libmap_override, readstrfn, NULL, NULL, closestrfn);
|
|
if (fp) {
|
|
lmc_parse(fp);
|
|
fclose(fp);
|
|
}
|
|
}
|
|
|
|
return (lm_count == 0);
|
|
}
|
|
|
|
static void
|
|
lmc_parse (FILE *fp)
|
|
{
|
|
char *cp;
|
|
char *f, *t, *c, *p;
|
|
char prog[MAXPATHLEN];
|
|
char line[MAXPATHLEN + 2];
|
|
|
|
dbg("%s(%p)", __func__, fp);
|
|
|
|
p = NULL;
|
|
while ((cp = fgets(line, MAXPATHLEN + 1, fp)) != NULL) {
|
|
t = f = c = NULL;
|
|
|
|
/* Skip over leading space */
|
|
while (rtld_isspace(*cp)) cp++;
|
|
|
|
/* Found a comment or EOL */
|
|
if (iseol(*cp)) continue;
|
|
|
|
/* Found a constraint selector */
|
|
if (*cp == '[') {
|
|
cp++;
|
|
|
|
/* Skip leading space */
|
|
while (rtld_isspace(*cp)) cp++;
|
|
|
|
/* Found comment, EOL or end of selector */
|
|
if (iseol(*cp) || *cp == ']')
|
|
continue;
|
|
|
|
c = cp++;
|
|
/* Skip to end of word */
|
|
while (!rtld_isspace(*cp) && !iseol(*cp) && *cp != ']')
|
|
cp++;
|
|
|
|
/* Skip and zero out trailing space */
|
|
while (rtld_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(rtld_isspace(*cp)) cp++;
|
|
if (!iseol(*cp)) continue;
|
|
|
|
strcpy(prog, c);
|
|
p = prog;
|
|
continue;
|
|
}
|
|
|
|
/* Parse the 'from' candidate. */
|
|
f = cp++;
|
|
while (!rtld_isspace(*cp) && !iseol(*cp)) cp++;
|
|
|
|
/* Skip and zero out the trailing whitespace */
|
|
while (rtld_isspace(*cp)) *cp++ = '\0';
|
|
|
|
/* Found a comment or EOL */
|
|
if (iseol(*cp)) continue;
|
|
|
|
/* Parse 'to' mapping */
|
|
t = cp++;
|
|
while (!rtld_isspace(*cp) && !iseol(*cp)) cp++;
|
|
|
|
/* Skip and zero out the trailing whitespace */
|
|
while (rtld_isspace(*cp)) *cp++ = '\0';
|
|
|
|
/* Should be no extra tokens at this point */
|
|
if (!iseol(*cp)) continue;
|
|
|
|
*cp = '\0';
|
|
lm_add(p, f, t);
|
|
}
|
|
}
|
|
|
|
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$";
|
|
|
|
dbg("%s(\"%s\", \"%s\", \"%s\")", __func__, p, f, t);
|
|
|
|
if ((lml = lmp_find(p)) == NULL)
|
|
lml = lmp_init(xstrdup(p));
|
|
|
|
lm = xmalloc(sizeof(struct lm));
|
|
lm->f = xstrdup(f);
|
|
lm->t = xstrdup(t);
|
|
TAILQ_INSERT_HEAD(lml, lm, lm_link);
|
|
lm_count++;
|
|
}
|
|
|
|
char *
|
|
lm_find (const char *p, const char *f)
|
|
{
|
|
struct lm_list *lml;
|
|
char *t;
|
|
|
|
dbg("%s(\"%s\", \"%s\")", __func__, p, f);
|
|
|
|
if (p != NULL && (lml = lmp_find(p)) != NULL) {
|
|
t = lml_find(lml, f);
|
|
if (t != NULL) {
|
|
/*
|
|
* Add a global mapping if we have
|
|
* a successful constrained match.
|
|
*/
|
|
lm_add(NULL, f, t);
|
|
return (t);
|
|
}
|
|
}
|
|
lml = lmp_find("$DEFAULT$");
|
|
if (lml != NULL)
|
|
return (lml_find(lml, f));
|
|
else
|
|
return (NULL);
|
|
}
|
|
|
|
/* Given a libmap translation list and a library name, return the
|
|
replacement library, or NULL */
|
|
#ifdef COMPAT_32BIT
|
|
char *
|
|
lm_findn (const char *p, const char *f, const int n)
|
|
{
|
|
char pathbuf[64], *s, *t;
|
|
|
|
if (n < sizeof(pathbuf) - 1)
|
|
s = pathbuf;
|
|
else
|
|
s = xmalloc(n + 1);
|
|
memcpy(s, f, n);
|
|
s[n] = '\0';
|
|
t = lm_find(p, s);
|
|
if (s != pathbuf)
|
|
free(s);
|
|
return (t);
|
|
}
|
|
#endif
|
|
|
|
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 (strcmp(f, lm->f) == 0)
|
|
return (lm->t);
|
|
return (NULL);
|
|
}
|
|
|
|
/* Given an executable name, return a pointer to the translation list or
|
|
NULL if no matches */
|
|
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 ((lmp->type == T_EXACT && strcmp(n, lmp->p) == 0) ||
|
|
(lmp->type == T_DIRECTORY && strncmp(n, lmp->p, strlen(lmp->p)) == 0) ||
|
|
(lmp->type == T_BASENAME && strcmp(quickbasename(n), lmp->p) == 0))
|
|
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;
|
|
if (n[strlen(n)-1] == '/')
|
|
lmp->type = T_DIRECTORY;
|
|
else if (strchr(n,'/') == NULL)
|
|
lmp->type = T_BASENAME;
|
|
else
|
|
lmp->type = T_EXACT;
|
|
TAILQ_INIT(&lmp->lml);
|
|
TAILQ_INSERT_HEAD(&lmp_head, lmp, lmp_link);
|
|
|
|
return (&lmp->lml);
|
|
}
|
|
|
|
/* libc basename is overkill. Return a pointer to the character after the
|
|
last /, or the original string if there are no slashes. */
|
|
static const char *
|
|
quickbasename (const char *path)
|
|
{
|
|
const char *p = path;
|
|
for (; *path; path++) {
|
|
if (*path == '/')
|
|
p = path+1;
|
|
}
|
|
return (p);
|
|
}
|
|
|
|
static int
|
|
readstrfn(void * cookie, char *buf, int len)
|
|
{
|
|
static char *current;
|
|
static int left;
|
|
int copied;
|
|
|
|
copied = 0;
|
|
if (!current) {
|
|
current = cookie;
|
|
left = strlen(cookie);
|
|
}
|
|
while (*current && left && len) {
|
|
*buf++ = *current++;
|
|
left--;
|
|
len--;
|
|
copied++;
|
|
}
|
|
return copied;
|
|
}
|
|
|
|
static int
|
|
closestrfn(void * cookie)
|
|
{
|
|
free(cookie);
|
|
return 0;
|
|
}
|