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

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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
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52
src/pulse/util.c
View file

@ -61,38 +61,40 @@
#include <pulsecore/log.h>
#include <pulsecore/core-util.h>
#include <pulsecore/macro.h>
#include <pulsecore/usergroup.h>
#include "util.h"
char *pa_get_user_name(char *s, size_t l) {
const char *p;
char *name = NULL;
#ifdef OS_IS_WIN32
char buf[1024];
#endif
#ifdef HAVE_PWD_H
struct passwd pw, *r;
struct passwd *r;
#endif
pa_assert(s);
pa_assert(l > 0);
if (!(p = (getuid() == 0 ? "root" : NULL)) &&
!(p = getenv("USER")) &&
!(p = getenv("LOGNAME")) &&
!(p = getenv("USERNAME"))) {
if ((p = (getuid() == 0 ? "root" : NULL)) ||
(p = getenv("USER")) ||
(p = getenv("LOGNAME")) ||
(p = getenv("USERNAME")))
{
name = pa_strlcpy(s, p, l);
} else {
#ifdef HAVE_PWD_H
#ifdef HAVE_GETPWUID_R
if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
#else
/* XXX Not thread-safe, but needed on OSes (e.g. FreeBSD 4.X)
* that do not support getpwuid_r. */
if ((r = getpwuid(getuid())) == NULL) {
#endif
if ((r = pa_getpwuid_malloc(getuid())) == NULL) {
pa_snprintf(s, l, "%lu", (unsigned long) getuid());
return s;
}
p = r->pw_name;
name = pa_strlcpy(s, r->pw_name, l);
pa_getpwuid_free(r);
#elif defined(OS_IS_WIN32) /* HAVE_PWD_H */
DWORD size = sizeof(buf);
@ -102,7 +104,7 @@ char *pa_get_user_name(char *s, size_t l) {
return NULL;
}
p = buf;
name = pa_strlcpy(s, buf, l);
#else /* HAVE_PWD_H */
@ -110,7 +112,7 @@ char *pa_get_user_name(char *s, size_t l) {
#endif /* HAVE_PWD_H */
}
return pa_strlcpy(s, p, l);
return name;
}
char *pa_get_host_name(char *s, size_t l) {
@ -126,11 +128,10 @@ char *pa_get_host_name(char *s, size_t l) {
}
char *pa_get_home_dir(char *s, size_t l) {
char *e;
char *e, *dir;
#ifdef HAVE_PWD_H
char buf[1024];
struct passwd pw, *r;
struct passwd *r;
#endif
pa_assert(s);
@ -143,22 +144,19 @@ char *pa_get_home_dir(char *s, size_t l) {
return pa_strlcpy(s, e, l);
#ifdef HAVE_PWD_H
errno = 0;
#ifdef HAVE_GETPWUID_R
if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
#else
/* XXX Not thread-safe, but needed on OSes (e.g. FreeBSD 4.X)
* that do not support getpwuid_r. */
if ((r = getpwuid(getuid())) == NULL) {
#endif
if ((r = pa_getpwuid_malloc(getuid())) == NULL) {
if (!errno)
errno = ENOENT;
return NULL;
}
return pa_strlcpy(s, r->pw_dir, l);
dir = pa_strlcpy(s, r->pw_dir, l);
pa_getpwuid_free(r);
return dir;
#else /* HAVE_PWD_H */
errno = ENOENT;