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pseudo_util.c
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pseudo_util.c
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/*
* pseudo_util.c, miscellaneous utility functions
*
* Copyright (c) 2008-2010 Wind River Systems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the Lesser GNU General Public License version 2.1 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the Lesser GNU General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* version 2.1 along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* we need access to RTLD_NEXT for a horrible workaround */
#define _GNU_SOURCE
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <regex.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
/* see the comments below about (*real_regcomp)() */
#include <dlfcn.h>
#include "pseudo.h"
#include "pseudo_ipc.h"
#include "pseudo_db.h"
struct pseudo_variables {
char *key;
size_t key_len;
char *value;
};
/* The order below is not arbitrary, but based on an assumption
* of how often things will be used.
*/
static struct pseudo_variables pseudo_env[] = {
{ "PSEUDO_PREFIX", 13, NULL },
{ "PSEUDO_BINDIR", 13, NULL },
{ "PSEUDO_LIBDIR", 13, NULL },
{ "PSEUDO_LOCALSTATEDIR", 20, NULL },
{ "PSEUDO_PASSWD", 13, NULL },
{ "PSEUDO_CHROOT", 13, NULL },
{ "PSEUDO_UIDS", 11, NULL },
{ "PSEUDO_GIDS", 11, NULL },
{ "PSEUDO_OPTS", 11, NULL },
{ "PSEUDO_DEBUG", 12, NULL },
{ "PSEUDO_DEBUG_FILE", 17, NULL },
{ "PSEUDO_TAG", 10, NULL },
{ "PSEUDO_ENOSYS_ABORT", 19, NULL },
{ "PSEUDO_NOSYMLINKEXP", 19, NULL },
{ "PSEUDO_RELOADED", 15, NULL },
{ "PSEUDO_DISABLED", 15, NULL },
{ NULL, 0, NULL } /* Magic terminator */
};
/* -1 - init hasn't been run yet
* 0 - init has been run
* 1 - init is running
*
* There are cases where the constructor is run AFTER the
* program starts playing with things, so we need to do our
* best to handle that case.
*/
static int pseudo_util_initted = -1; /* Not yet run */
#if 0
static void
dump_env(char **envp) {
size_t i = 0;
for (i = 0; envp[i]; i++) {
pseudo_debug(0,"dump_envp: [%d]%s\n", (int) i, envp[i]);
}
for (i = 0; pseudo_env[i].key; i++) {
pseudo_debug(0,"dump_envp: {%d}%s=%s\n", (int) i, pseudo_env[i].key, pseudo_env[i].value);
}
pseudo_debug(0, "dump_envp: _in_init %d\n", pseudo_util_initted);
}
#endif
/* Caller must free memory! */
char *
pseudo_get_value(const char *key) {
size_t i = 0;
char * value;
if (pseudo_util_initted == -1)
pseudo_init_util();
for (i = 0; pseudo_env[i].key && memcmp(pseudo_env[i].key, key, pseudo_env[i].key_len + 1); i++)
;
/* Check if the environment has it and we don't ...
* if so, something went wrong... so we'll attempt to recover
*/
if (pseudo_env[i].key && !pseudo_env[i].value && getenv(pseudo_env[i].key))
pseudo_init_util();
if (pseudo_env[i].value)
value = strdup(pseudo_env[i].value);
else
value = NULL;
if (!pseudo_env[i].key)
pseudo_diag("Unknown variable %s.\n", key);
return value;
}
/* We make a copy, so the original values should be freed. */
int
pseudo_set_value(const char *key, const char *value) {
int rc = 0;
size_t i = 0;
if (pseudo_util_initted == -1)
pseudo_init_util();
for (i = 0; pseudo_env[i].key && memcmp(pseudo_env[i].key, key, pseudo_env[i].key_len + 1); i++)
;
if (pseudo_env[i].key) {
if (pseudo_env[i].value)
free(pseudo_env[i].value);
if (value) {
char *new = strdup(value);
if (new)
pseudo_env[i].value = new;
else
pseudo_diag("warning: failed to save new value (%s) for key %s\n",
value, key);
} else
pseudo_env[i].value = NULL;
} else {
if (!pseudo_util_initted) pseudo_diag("Unknown variable %s.\n", key);
rc = -EINVAL;
}
return rc;
}
void
pseudo_init_util(void) {
size_t i = 0;
char * env;
pseudo_util_initted = 1;
for (i = 0; pseudo_env[i].key; i++) {
if (getenv(pseudo_env[i].key))
pseudo_set_value(pseudo_env[i].key, getenv(pseudo_env[i].key));
}
pseudo_util_initted = 0;
/* Somewhere we have to set the debug level.. */
env = pseudo_get_value("PSEUDO_DEBUG");
if (env) {
int i;
int level = atoi(env);
for (i = 0; i < level; ++i) {
pseudo_debug_verbose();
}
}
free(env);
}
/* 5 = ridiculous levels of duplication
* 4 = exhaustive detail
* 3 = detailed protocol analysis
* 2 = higher-level protocol analysis
* 1 = stuff that might go wrong
* 0 = fire and arterial bleeding
*/
static int max_debug_level = 0;
int pseudo_util_debug_fd = 2;
static int debugged_newline = 1;
static char pid_text[32];
static size_t pid_len;
static int pseudo_append_element(char **pnewpath, char **proot, size_t *pallocated, char **pcurrent, const char *element, size_t elen, int leave_this);
static int pseudo_append_elements(char **newpath, char **root, size_t *allocated, char **current, const char *elements, size_t elen, int leave_last);
extern char **environ;
static ssize_t pseudo_max_pathlen = -1;
static ssize_t pseudo_sys_max_pathlen = -1;
/* in our installed system, we usually use a name of the form
* libpseudoCHECKSUM.so, where CHECKSUM is an md5 checksum of the host
* libc.so -- this forces rebuilds of the library when the C library
* changes. The problem is that the pseudo binary may be
* a prebuilt, in which case it doesn't know about CHECKSUM, so it
* has to determine whether a given PRELINK_LIBRARIES contains libpseudo.so
* or libpseudoCHECKSUM.so, without prior knowledge... Fancy!
*
* We search for anything matching libpseudo*.so, where * is any
* sequence of non-spaces (including an empty string), with either
* the beginning of the string or a space in front of it, and either
* the end of the string or a space after it.
*/
static char *libpseudo_name = "libpseudo.so";
/* this used to look for a "libpseudo*.so", but it turns out you can
* specify a path even on Linux.
*/
static char *libpseudo_pattern = "(^|=| )[^ ]*libpseudo[^ ]*\\.so($| )";
static regex_t libpseudo_regex;
static int libpseudo_regex_compiled = 0;
/* Okay, so, there's a funny story behind this. On one of the systems
* we need to run on, /usr/bin/find happens to provide its own
* definitions of regcomp and regexec which are INCOMPATIBLE with the
* ones in the C library, and not only that, but which have buggy and/or
* incompatible semantics, such that they trash elements of the pmatch
* array. So we do our best to call the "real" regcomp/regexec in the
* C library. If we can't find them, we just do our best and hope that
* no one called us from a program with incompatible variants.
*
*/
#if PSEUDO_PORT_LINUX
static int (*real_regcomp)(regex_t *__restrict __preg, const char *__restrict __pattern, int __cflags);
static int (*real_regexec)(const regex_t *__restrict __preg, const char *__restrict __string, size_t __nmatch, regmatch_t __pmatch[__restrict_arr], int __eflags);
#else
#define real_regcomp regcomp
#define real_regexec regexec
#endif /* PSEUDO_PORT_LINUX */
static int
libpseudo_regex_init(void) {
int rc;
if (libpseudo_regex_compiled)
return 0;
#if PSEUDO_PORT_LINUX
real_regcomp = dlsym(RTLD_NEXT, "regcomp");
if (!real_regcomp)
real_regcomp = regcomp;
real_regexec = dlsym(RTLD_NEXT, "regexec");
if (!real_regexec)
real_regexec = regexec;
#endif
rc = (*real_regcomp)(&libpseudo_regex, libpseudo_pattern, REG_EXTENDED);
if (rc == 0)
libpseudo_regex_compiled = 1;
return rc;
}
/* given a space-or-colon-separated list of files, ala PRELINK_LIBRARIES,
# return that list without any variants of libpseudo*.so.
*/
static char *
without_libpseudo(char *list) {
regmatch_t pmatch[1];
int counter = 0;
int skip_start = 0;
if (libpseudo_regex_init())
return NULL;
if (list[0] == '=' || list[0] == PSEUDO_LINKPATH_SEPARATOR[0])
skip_start = 1;
if ((*real_regexec)(&libpseudo_regex, list, 1, pmatch, 0)) {
return list;
}
list = strdup(list);
while (!(*real_regexec)(&libpseudo_regex, list, 1, pmatch, 0)) {
char *start = list + pmatch[0].rm_so;
char *end = list + pmatch[0].rm_eo;
/* don't copy over the space or = */
start += skip_start;
memmove(start, end, strlen(end) + 1);
++counter;
if (counter > 5) {
pseudo_diag("Found way too many libpseudo.so in environment, giving up.\n");
return list;
}
}
return list;
}
static char *
with_libpseudo(char *list, char *libdir_path) {
regmatch_t pmatch[1];
if (libpseudo_regex_init())
return NULL;
if ((*real_regexec)(&libpseudo_regex, list, 1, pmatch, 0)) {
size_t len;
#if PSEUDO_PORT_DARWIN
/* <%s:%s/%s\0> */
len = strlen(list) + 1 + strlen(libdir_path) + 1 + strlen(libpseudo_name) + 1;
#else
/* suppress warning */
(void) libdir_path;
/* <%s %s\0> */
len = strlen(list) + 1 + strlen(libpseudo_name) + 1;
#endif
char *new = malloc(len);
if (new) {
/* insert space only if there were previous bits */
/* on Darwin, we have to provide the full path to
* libpseudo
*/
#if PSEUDO_PORT_DARWIN
snprintf(new, len, "%s%s%s/%s", list,
*list ? PSEUDO_LINKPATH_SEPARATOR : "",
libdir_path ? libdir_path : "",
libpseudo_name);
#else
snprintf(new, len, "%s%s%s", list,
*list ? PSEUDO_LINKPATH_SEPARATOR : "",
libpseudo_name);
#endif
}
return new;
} else {
return strdup(list);
}
}
char *pseudo_version = PSEUDO_VERSION;
void
pseudo_debug_terse(void) {
if (max_debug_level > 0)
--max_debug_level;
char s[16];
snprintf(s, 16, "%d", max_debug_level);
pseudo_set_value("PSEUDO_DEBUG", s);
}
void
pseudo_debug_verbose(void) {
++max_debug_level;
char s[16];
snprintf(s, 16, "%d", max_debug_level);
pseudo_set_value("PSEUDO_DEBUG", s);
}
int
pseudo_diag(char *fmt, ...) {
va_list ap;
char debuff[8192];
int len;
/* gcc on Ubuntu 8.10 requires that you examine the return from
* write(), and won't let you cast it to void. Of course, if you
* can't print error messages, there's nothing to do.
*/
int wrote = 0;
va_start(ap, fmt);
len = vsnprintf(debuff, 8192, fmt, ap);
va_end(ap);
if (len > 8192)
len = 8192;
if (debugged_newline && max_debug_level > 1) {
wrote += write(pseudo_util_debug_fd, pid_text, pid_len);
}
debugged_newline = (debuff[len - 1] == '\n');
wrote += write(pseudo_util_debug_fd, "pseudo: ", 8);
wrote += write(pseudo_util_debug_fd, debuff, len);
return wrote;
}
int
pseudo_debug_real(int level, char *fmt, ...) {
va_list ap;
char debuff[8192];
int len;
int wrote = 0;
if (max_debug_level < level)
return 0;
va_start(ap, fmt);
len = vsnprintf(debuff, 8192, fmt, ap);
va_end(ap);
if (len > 8192)
len = 8192;
if (debugged_newline && max_debug_level > 1) {
wrote += write(pseudo_util_debug_fd, pid_text, pid_len);
}
debugged_newline = (debuff[len - 1] == '\n');
wrote += write(pseudo_util_debug_fd, debuff, len);
return wrote;
}
/* given n, pick a multiple of block enough bigger than n
* to give us some breathing room.
*/
static inline size_t
round_up(size_t n, size_t block) {
return block * (((n + block / 4) / block) + 1);
}
/* store pid in text form for prepending to messages */
void
pseudo_new_pid() {
pid_len = snprintf(pid_text, 32, "%d: ", getpid());
pseudo_debug(2, "new pid.\n");
}
/* helper function for pseudo_fix_path
* adds "element" to "newpath" at location current, if it can, then
* checks whether this now points to a symlink. If it does, expand
* the symlink, appending each element in turn the same way.
*/
static int
pseudo_append_element(char **pnewpath, char **proot, size_t *pallocated, char **pcurrent, const char *element, size_t elen, int leave_this) {
static int link_recursion = 0;
size_t curlen, allocated;
char *newpath, *current, *root;
struct stat buf;
if (!pnewpath || !*pnewpath ||
!pcurrent || !*pcurrent ||
!proot || !*proot ||
!pallocated || !element) {
pseudo_diag("pseudo_append_element: invalid args.\n");
return -1;
}
newpath = *pnewpath;
allocated = *pallocated;
current = *pcurrent;
root = *proot;
/* sanity-check: ignore // or /./ */
if (elen == 0 || (elen == 1 && *element == '.')) {
return 1;
}
/* backtrack for .. */
if (elen == 2 && element[0] == '.' && element[1] == '.') {
/* if newpath's whole contents are '/', do nothing */
if (current <= root + 1)
return 1;
/* backtrack to the character before the / */
current -= 2;
/* now find the previous slash */
while (current > root && *current != '/') {
--current;
}
/* and point to the nul just past it */
*(++current) = '\0';
*pcurrent = current;
return 1;
}
curlen = current - newpath;
/* current length, plus / <element> / \0 */
/* => curlen + elen + 3 */
if (curlen + elen + 3 > allocated) {
char *bigger;
size_t big = round_up(allocated + elen, 256);
bigger = malloc(big);
if (!bigger) {
pseudo_diag("pseudo_append_element: couldn't allocate space (wanted %lu bytes).\n", (unsigned long) big);
return -1;
}
memcpy(bigger, newpath, curlen);
current = bigger + curlen;
root = bigger + (root - newpath);
free(newpath);
newpath = bigger;
allocated = big;
*pnewpath = newpath;
*pcurrent = current;
*proot = root;
*pallocated = allocated;
}
memcpy(current, element, elen);
current += elen;
/* nul-terminate, and we now point to the nul after the slash */
*current = '\0';
/* now, the moment of truth... is that a symlink? */
/* if lstat fails, that's fine -- nonexistent files aren't symlinks */
if (!leave_this) {
int is_link;
is_link = (lstat(newpath, &buf) != -1) && S_ISLNK(buf.st_mode);
if (link_recursion >= PSEUDO_MAX_LINK_RECURSION && is_link) {
pseudo_diag("link recursion too deep, not expanding path '%s'.\n", newpath);
is_link = 0;
}
if (is_link) {
char linkbuf[pseudo_path_max() + 1];
ssize_t linklen;
int retval;
linklen = readlink(newpath, linkbuf, pseudo_path_max());
if (linklen == -1) {
pseudo_diag("uh-oh! '%s' seems to be a symlink, but I can't read it. Ignoring.", newpath);
return 0;
}
/* null-terminate buffer */
linkbuf[linklen] = '\0';
/* absolute symlink means start over! */
if (*linkbuf == '/') {
current = newpath + 1;
} else {
/* point back at the end of the previous path... */
current -= elen;
}
/* null terminate at the new pointer */
*current = '\0';
/* append all the elements in series */
*pcurrent = current;
++link_recursion;
retval = pseudo_append_elements(pnewpath, proot, pallocated, pcurrent, linkbuf, linklen, 0);
--link_recursion;
return retval;
}
}
/* okay, not a symlink, go ahead and append a slash */
*(current++) = '/';
*current = '\0';
*pcurrent = current;
return 1;
}
static int
pseudo_append_elements(char **newpath, char **root, size_t *allocated, char **current, const char *element, size_t elen, int leave_last) {
int retval = 1;
const char * start = element;
if (!newpath || !*newpath ||
!root || !*root ||
!current || !*current ||
!element) {
pseudo_diag("pseudo_append_elements: invalid arguments.");
return -1;
}
while (element < (start + elen) && *element) {
size_t this_elen;
int leave_this = 0;
char *next = strchr(element, '/');
if (!next) {
next = strchr(element, '\0');
leave_this = leave_last;
}
this_elen = next - element;
switch (this_elen) {
case 0: /* path => '/' */
break;
case 1: /* path => '?/' */
if (*element != '.') {
if (pseudo_append_element(newpath, root, allocated, current, element, this_elen, leave_this) == -1) {
retval = -1;
}
}
break;
default:
if (pseudo_append_element(newpath, root, allocated, current, element, this_elen, leave_this) == -1) {
retval = -1;
}
break;
}
/* and now move past the separator */
element += this_elen + 1;
}
return retval;
}
/* Canonicalize path. "base", if present, is an already-canonicalized
* path of baselen characters, presumed not to end in a /. path is
* the new path to be canonicalized. The tricky part is that path may
* contain symlinks, which must be resolved.
* if "path" starts with a /, then it is an absolute path, and
* we ignore base.
*/
char *
pseudo_fix_path(const char *base, const char *path, size_t rootlen, size_t baselen, size_t *lenp, int leave_last) {
size_t newpathlen, pathlen;
char *newpath;
char *current;
char *effective_root;
if (!path) {
pseudo_diag("can't fix empty path.\n");
return 0;
}
pathlen = strlen(path);
newpathlen = pathlen;
if (baselen && path[0] != '/') {
newpathlen += baselen + 2;
}
/* allow a bit of slush. overallocating a bit won't
* hurt. rounding to 256's in the hopes that it makes life
* easier for the library.
*/
newpathlen = round_up(newpathlen, 256);
newpath = malloc(newpathlen);
if (!newpath) {
pseudo_diag("allocation failed seeking memory for path (%s).\n", path);
return 0;
}
current = newpath;
if (baselen) {
memcpy(current, base, baselen);
current += baselen;
}
/* "root" is a pointer to the beginning of the *modifiable*
* part of the string; you can't back up over it.
*/
effective_root = newpath + rootlen;
*current++ = '/';
*current = '\0';
/* at any given point:
* current points to just after the last / of newpath
* path points to the next element of path
* newpathlen is the total allocated length of newpath
* (current - newpath) is the used length of newpath
*/
if (pseudo_append_elements(&newpath, &effective_root, &newpathlen, ¤t, path, pathlen, leave_last) != -1) {
--current;
if (*current == '/' && current > effective_root) {
*current = '\0';
}
pseudo_debug(5, "%s + %s => <%s>\n",
base ? base : "<nil>",
path ? path : "<nil>",
newpath ? newpath : "<nil>");
if (lenp) {
*lenp = current - newpath;
}
return newpath;
} else {
free(newpath);
return 0;
}
}
/* remove the libpseudo stuff from the environment (leaving other preloads
* alone).
* There's an implicit memory leak here, but this is called only right
* before an exec(), or at most once in a given run.
*
* we don't try to fix the library path.
*/
void pseudo_dropenv() {
char *ld_preload = getenv(PRELINK_LIBRARIES);
if (ld_preload) {
ld_preload = without_libpseudo(ld_preload);
if (!ld_preload) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_LIBRARIES);
}
if (ld_preload && strlen(ld_preload)) {
pseudo_diag("ld_preload without: <%s>\n", ld_preload);
setenv(PRELINK_LIBRARIES, ld_preload, 1);
} else {
unsetenv(PRELINK_LIBRARIES);
}
}
}
char **
pseudo_dropenvp(char * const *envp) {
char **new_envp;
int i, j;
for (i = 0; envp[i]; ++i) ;
new_envp = malloc((i + 1) * sizeof(*new_envp));
if (!new_envp) {
pseudo_diag("fatal: can't allocate new environment.\n");
return NULL;
}
j = 0;
for (i = 0; envp[i]; ++i) {
if (STARTSWITH(envp[i], PRELINK_LIBRARIES "=")) {
char *new_val = without_libpseudo(envp[i]);
if (!new_val) {
pseudo_diag("fatal: can't allocate new environment variable.\n");
return 0;
} else {
/* don't keep an empty value; if the whole string is
* PRELINK_LIRBARIES=, we just drop it. */
if (strcmp(new_val, PRELINK_LIBRARIES "=")) {
new_envp[j++] = new_val;
}
}
} else {
new_envp[j++] = envp[i];
}
}
new_envp[j++] = NULL;
return new_envp;
}
/* add pseudo stuff to the environment.
*/
void
pseudo_setupenv() {
size_t i = 0;
pseudo_debug(2, "setting up pseudo environment.\n");
/* Make sure everything has been evaluated */
free(pseudo_get_prefix(NULL));
free(pseudo_get_bindir());
free(pseudo_get_libdir());
free(pseudo_get_localstatedir());
while (pseudo_env[i].key) {
if (pseudo_env[i].value)
setenv(pseudo_env[i].key, pseudo_env[i].value, 0);
i++;
}
const char *ld_library_path = getenv(PRELINK_PATH);
char *libdir_path = pseudo_libdir_path(NULL);
if (!ld_library_path) {
size_t len = strlen(libdir_path) + 1 + (strlen(libdir_path) + 2) + 1;
char *newenv = malloc(len);
if (!newenv) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_PATH);
}
snprintf(newenv, len, "%s:%s64", libdir_path, libdir_path);
setenv(PRELINK_PATH, newenv, 1);
} else if (!strstr(ld_library_path, libdir_path)) {
size_t len = strlen(ld_library_path) + 1 + strlen(libdir_path) + 1 + (strlen(libdir_path) + 2) + 1;
char *newenv = malloc(len);
if (!newenv) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_PATH);
}
snprintf(newenv, len, "%s:%s:%s64", ld_library_path, libdir_path, libdir_path);
setenv(PRELINK_PATH, newenv, 1);
} else {
/* nothing to do, ld_library_path exists and contains
* our preferred path */
}
char *ld_preload = getenv(PRELINK_LIBRARIES);
if (ld_preload) {
ld_preload = with_libpseudo(ld_preload, libdir_path);
if (!ld_preload) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_LIBRARIES);
}
setenv(PRELINK_LIBRARIES, ld_preload, 1);
free(ld_preload);
} else {
ld_preload = with_libpseudo("", libdir_path);
if (!ld_preload) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_LIBRARIES);
}
setenv(PRELINK_LIBRARIES, ld_preload, 1);
free(ld_preload);
}
/* we kept libdir path until now because with_libpseudo might
* need it
*/
free(libdir_path);
#if PSEUDO_PORT_DARWIN
char *force_flat = getenv("DYLD_FORCE_FLAT_NAMESPACE");
if (!force_flat) {
setenv("DYLD_FORCE_FLAT_NAMESPACE", "1", 1);
}
#endif
}
/* add pseudo stuff to the environment.
* We can't just use setenv(), because one use case is that we're trying
* to modify the environment of a process about to be forked through
* execve().
*/
char **
pseudo_setupenvp(char * const *envp) {
char **new_envp;
size_t i, j, k;
size_t env_count = 0;
size_t size_pseudoenv = 0;
char *ld_preload = NULL, *ld_library_path = NULL;
pseudo_debug(2, "setting up envp environment.\n");
/* Make sure everything has been evaluated */
free(pseudo_get_prefix(NULL));
free(pseudo_get_bindir());
free(pseudo_get_libdir());
free(pseudo_get_localstatedir());
for (i = 0; envp[i]; ++i) {
if (STARTSWITH(envp[i], PRELINK_LIBRARIES "=")) {
ld_preload = envp[i];
}
if (STARTSWITH(envp[i], PRELINK_PATH "=")) {
ld_library_path = envp[i];
}
++env_count;
}
for (i = 0; pseudo_env[i].key; i++) {
size_pseudoenv++;
}
env_count += size_pseudoenv; /* We're going to over allocate */
j = 0;
new_envp = malloc((env_count + 1) * sizeof(*new_envp));
if (!new_envp) {
pseudo_diag("fatal: can't allocate new environment.\n");
return NULL;
}
char *libdir_path = pseudo_libdir_path(NULL);
if (!ld_library_path) {
size_t len = strlen(PRELINK_PATH "=") + strlen(libdir_path) + 1 + (strlen(libdir_path) + 2) + 1;
char *newenv = malloc(len);
if (!newenv) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_PATH);
}
snprintf(newenv, len, PRELINK_PATH "=%s:%s64", libdir_path, libdir_path);
new_envp[j++] = newenv;
} else if (!strstr(ld_library_path, libdir_path)) {
size_t len = strlen(ld_library_path) + 1 + strlen(libdir_path) + 1 + (strlen(libdir_path) + 2) + 1;
char *newenv = malloc(len);
if (!newenv) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_PATH);
}
snprintf(newenv, len, "%s:%s:%s64", ld_library_path, libdir_path, libdir_path);
new_envp[j++] = newenv;
} else {
/* keep old value */
new_envp[j++] = ld_library_path;
}
if (ld_preload) {
ld_preload = with_libpseudo(ld_preload, libdir_path);
if (!ld_preload) {
pseudo_diag("fatal: can't allocate new %s variable.\n", PRELINK_LIBRARIES);
}
new_envp[j++] = ld_preload;
} else {
ld_preload = with_libpseudo("", libdir_path);
size_t len = strlen(PRELINK_LIBRARIES "=") + strlen(ld_preload) + 1;
char *newenv = malloc(len);
snprintf(newenv, len, PRELINK_LIBRARIES "=%s", ld_preload);
new_envp[j++] = newenv;
free(ld_preload);
}
free(libdir_path);
for (i = 0; envp[i]; ++i) {
if (STARTSWITH(envp[i], PRELINK_LIBRARIES "=")) continue;
if (STARTSWITH(envp[i], PRELINK_PATH "=")) continue;
new_envp[j++] = envp[i];
}
for (i = 0; pseudo_env[i].key; i++) {
int found = 0;
for (k = 0; k < j; k++) {
if (!strncmp(pseudo_env[i].key,new_envp[k],strlen(pseudo_env[i].key))) {
found = 1;
break;
}
}
if (!found && pseudo_env[i].key && pseudo_env[i].value) {
size_t len = strlen(pseudo_env[i].key) + 1 + strlen(pseudo_env[i].value) + 1;
char *newenv = malloc(len);
if (!newenv) {
pseudo_diag("fatal: can't allocate new variable.\n");
}
snprintf(newenv, len, "%s=%s", pseudo_env[i].key, pseudo_env[i].value);
new_envp[j++] = newenv;
}
}
new_envp[j++] = NULL;
return new_envp;
}
/* Append the file value to the prefix value. */
char *
pseudo_append_path(const char * prefix, size_t prefix_len, char *file) {
char *path;
if (!file) {
return strdup(prefix);
} else {
size_t len = prefix_len + strlen(file) + 2;
path = malloc(len);
if (path) {
char *endptr;
int rc;
rc = snprintf(path, len, "%s", prefix);
/* this certainly SHOULD be impossible */
if ((size_t) rc >= len)
rc = len - 1;
endptr = path + rc;
/* strip extra slashes.
* This probably has no real effect, but I don't like
* seeing "//" in paths.
*/
while ((endptr > path) && (endptr[-1] == '/'))
--endptr;
snprintf(endptr, len - (endptr - path), "/%s", file);
}
return path;
}
}
/* get the full path to a file under $PSEUDO_PREFIX. Other ways of
* setting the prefix all set it in the environment.
*/
char *
pseudo_prefix_path(char *file) {
char * rc;
char * prefix = pseudo_get_prefix(NULL);
if (!prefix) {
pseudo_diag("You must set the PSEUDO_PREFIX environment variable to run pseudo.\n");
exit(1);
}
rc = pseudo_append_path(prefix, strlen(prefix), file);
free(prefix);
return rc;
}
/* get the full path to a file under $PSEUDO_BINDIR. */
char *
pseudo_bindir_path(char *file) {
char * rc;
char * bindir = pseudo_get_bindir();
if (!bindir) {
pseudo_diag("You must set the PSEUDO_BINDIR environment variable to run pseudo.\n");
exit(1);
}
rc = pseudo_append_path(bindir, strlen(bindir), file);
free(bindir);
return rc;
}
/* get the full path to a file under $PSEUDO_LIBDIR. */
char *
pseudo_libdir_path(char *file) {
char * rc;
char * libdir = pseudo_get_libdir();
if (!libdir) {
pseudo_diag("You must set the PSEUDO_LIBDIR environment variable to run pseudo.\n");
exit(1);
}
rc = pseudo_append_path(libdir, strlen(libdir), file);
free(libdir);
return rc;
}
/* get the full path to a file under $PSEUDO_LOCALSTATEDIR. */
char *
pseudo_localstatedir_path(char *file) {
char * rc;
char * localstatedir = pseudo_get_localstatedir();
if (!localstatedir) {
pseudo_diag("You must set the PSEUDO_LOCALSTATEDIR environment variable to run pseudo.\n");
exit(1);
}
rc = pseudo_append_path(localstatedir, strlen(localstatedir), file);
free(localstatedir);
return rc;
}
char *
pseudo_get_prefix(char *pathname) {
char *s = pseudo_get_value("PSEUDO_PREFIX");