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core: Add thread-safe group info functions with dynamic buffers

Browse source 
Provides getgrgid, getgrnam, getpwuid & getpwnam replacements that are
thread safe (a la getgrgid_r() and friends) that internally
handle allocating big-enough buffers to avoid ERANGE errors
on large users or groups.
This commit is contained in:
Ted Percival 2009-08-21 16:02:57 -06:00 • committed by Lennart Poettering
parent 9d1cc133f3
commit 15eb03a5b3
6 changed files with 643 additions and 115 deletions
Download patch file Download diff file Expand all files Collapse all files

106
src/pulsecore/core-util.c
View file

@ -115,6 +115,7 @@
#include <pulsecore/macro.h>
#include <pulsecore/thread.h>
#include <pulsecore/strbuf.h>
#include <pulsecore/usergroup.h>
#include "core-util.h"
@ -969,42 +970,24 @@ fail:
/* Check whether the specified GID and the group name match */
static int is_group(gid_t gid, const char *name) {
struct group group, *result = NULL;
long n;
void *data;
struct group *group = NULL;
int r = -1;
#ifdef HAVE_GETGRGID_R
#ifdef _SC_GETGR_R_SIZE_MAX
n = sysconf(_SC_GETGR_R_SIZE_MAX);
#else
n = -1;
#endif
if (n <= 0)
n = 512;
data = pa_xmalloc((size_t) n);
if ((errno = getgrgid_r(gid, &group, data, (size_t) n, &result)) || !result)
#else
errno = 0;
if (!(result = getgrgid(gid)))
#endif
if (!(group = pa_getgrgid_malloc(gid)))
{
if (!errno)
errno = ENOENT;
pa_log("getgrgid(%u): %s", gid, pa_cstrerror(errno));
pa_log("pa_getgrgid_malloc(%u): %s", gid, pa_cstrerror(errno));
goto finish;
}
r = strcmp(name, result->gr_name) == 0;
r = strcmp(name, group->gr_name) == 0;
finish:
pa_xfree(data);
pa_getgrgid_free(group);
return r;
}
@ -1053,69 +1036,37 @@ finish:
/* Check whether the specifc user id is a member of the specified group */
int pa_uid_in_group(uid_t uid, const char *name) {
char *g_buf = NULL, *p_buf = NULL;
long g_n, p_n;
struct group grbuf, *gr = NULL;
struct group *group = NULL;
char **i;
int r = -1;
#ifdef HAVE_GETGRNAM_R
#ifdef _SC_GETGR_R_SIZE_MAX
g_n = sysconf(_SC_GETGR_R_SIZE_MAX);
#else
g_n = -1;
#endif
if (g_n <= 0)
g_n = 512;
g_buf = pa_xmalloc((size_t) g_n);
if ((errno = getgrnam_r(name, &grbuf, g_buf, (size_t) g_n, &gr)) != 0 || !gr)
#else
errno = 0;
if (!(gr = getgrnam(name)))
#endif
if (!(group = pa_getgrnam_malloc(name)))
{
if (!errno)
errno = ENOENT;
goto finish;
}
#ifdef HAVE_GETPWNAM_R
#ifdef _SC_GETPW_R_SIZE_MAX
p_n = sysconf(_SC_GETPW_R_SIZE_MAX);
#else
p_n = -1;
#endif
if (p_n <= 0)
p_n = 512;
p_buf = pa_xmalloc((size_t) p_n);
#endif
r = 0;
for (i = gr->gr_mem; *i; i++) {
struct passwd pwbuf, *pw = NULL;
for (i = group->gr_mem; *i; i++) {
struct passwd *pw = NULL;
#ifdef HAVE_GETPWNAM_R
if ((errno = getpwnam_r(*i, &pwbuf, p_buf, (size_t) p_n, &pw)) != 0 || !pw)
#else
errno = 0;
if (!(pw = getpwnam(*i)))
#endif
if (!(pw = pa_getpwnam_malloc(*i)))
continue;
if (pw->pw_uid == uid) {
if (pw->pw_uid == uid)
r = 1;
pa_getpwnam_free(pw);
if (r == 1)
break;
}
}
finish:
pa_xfree(g_buf);
pa_xfree(p_buf);
pa_getgrnam_free(group);
return r;
}
@ -1123,27 +1074,10 @@ finish:
/* Get the GID of a gfiven group, return (gid_t) -1 on failure. */
gid_t pa_get_gid_of_group(const char *name) {
gid_t ret = (gid_t) -1;
char *g_buf = NULL;
long g_n;
struct group grbuf, *gr = NULL;
struct group *gr = NULL;
#ifdef HAVE_GETGRNAM_R
#ifdef _SC_GETGR_R_SIZE_MAX
g_n = sysconf(_SC_GETGR_R_SIZE_MAX);
#else
g_n = -1;
#endif
if (g_n <= 0)
g_n = 512;
g_buf = pa_xmalloc((size_t) g_n);
if ((errno = getgrnam_r(name, &grbuf, g_buf, (size_t) g_n, &gr)) != 0 || !gr)
#else
errno = 0;
if (!(gr = getgrnam(name)))
#endif
if (!(gr = pa_getgrnam_malloc(name)))
{
if (!errno)
errno = ENOENT;
@ -1153,7 +1087,7 @@ gid_t pa_get_gid_of_group(const char *name) {
ret = gr->gr_gid;
finish:
pa_xfree(g_buf);
pa_getgrnam_free(gr);
return ret;
}