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/*
* <pwd.h> wrapper functions.
*
* Authors:
* Jonathan Pryor (jonpryor@vt.edu)
*
* Copyright (C) 2004 Jonathan Pryor
*/
#include <pwd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "mph.h"
G_BEGIN_DECLS
struct Mono_Posix_Syscall__Passwd {
/* string */ char *pw_name;
/* string */ char *pw_passwd;
/* uid_t */ mph_uid_t pw_uid;
/* gid_t */ mph_gid_t pw_gid;
/* string */ char *pw_gecos;
/* string */ char *pw_dir;
/* string */ char *pw_shell;
/* string */ char *_pw_buf_;
};
/*
* Copy the native `passwd' structure to it's managed representation.
*
* To minimize separate mallocs, all the strings are allocated within the same
* memory block (stored in _pw_buf_).
*/
static int
copy_passwd (struct Mono_Posix_Syscall__Passwd *to, struct passwd *from)
{
enum {PW_NAME = 0, PW_PASSWD, PW_GECOS, PW_DIR, PW_SHELL, PW_LAST};
size_t buflen, len[PW_LAST];
/* bool */ unsigned char copy[PW_LAST] = {0};
const char *source[PW_LAST];
char **dest[PW_LAST];
int i;
char *cur;
to->pw_uid = from->pw_uid;
to->pw_gid = from->pw_gid;
to->pw_name = NULL;
to->pw_passwd = NULL;
to->pw_gecos = NULL;
to->pw_dir = NULL;
to->pw_shell = NULL;
to->_pw_buf_ = NULL;
source[PW_NAME] = from->pw_name;
source[PW_PASSWD] = from->pw_passwd;
source[PW_GECOS] = from->pw_gecos;
source[PW_DIR] = from->pw_dir;
source[PW_SHELL] = from->pw_shell;
dest[PW_NAME] = &to->pw_name;
dest[PW_PASSWD] = &to->pw_passwd;
dest[PW_GECOS] = &to->pw_gecos;
dest[PW_DIR] = &to->pw_dir;
dest[PW_SHELL] = &to->pw_shell;
buflen = PW_LAST;
/* over-rigorous checking for integer overflow */
for (i = 0; i != PW_LAST; ++i) {
len[i] = strlen (source[i]);
if (len[i] < INT_MAX - buflen) {
buflen += len[i];
copy[i] = 1;
}
}
cur = to->_pw_buf_ = (char*) malloc (buflen);
if (cur == NULL) {
return -1;
}
for (i = 0; i != PW_LAST; ++i) {
if (copy[i]) {
*dest[i] = strcpy (cur, source[i]);
cur += (len[i] + 1);
}
}
return 0;
}
gint32
Mono_Posix_Syscall_getpwnam (const char *name, struct Mono_Posix_Syscall__Passwd *pwbuf)
{
struct passwd *pw;
if (pwbuf == NULL) {
errno = EFAULT;
return -1;
}
pw = getpwnam (name);
if (pw == NULL)
return -1;
if (copy_passwd (pwbuf, pw) == -1) {
errno = ENOMEM;
return -1;
}
return 0;
}
gint32
Mono_Posix_Syscall_getpwuid (mph_uid_t uid, struct Mono_Posix_Syscall__Passwd *pwbuf)
{
struct passwd *pw;
if (pwbuf == NULL) {
errno = EFAULT;
return -1;
}
errno = 0;
pw = getpwuid (uid);
if (pw == NULL) {
return -1;
}
if (copy_passwd (pwbuf, pw) == -1) {
errno = ENOMEM;
return -1;
}
return 0;
}
#ifdef HAVE_GETPWNAM_R
gint32
Mono_Posix_Syscall_getpwnam_r (const char *name,
struct Mono_Posix_Syscall__Passwd *pwbuf,
struct passwd **pwbufp)
{
char *buf, *buf2;
size_t buflen;
int r;
struct passwd _pwbuf;
if (pwbuf == NULL) {
errno = EFAULT;
return -1;
}
buf = buf2 = NULL;
buflen = 2;
do {
buf2 = realloc (buf, buflen *= 2);
if (buf2 == NULL) {
free (buf);
errno = ENOMEM;
return -1;
}
buf = buf2;
} while ((r = getpwnam_r (name, &_pwbuf, buf, buflen, pwbufp)) &&
recheck_range (r));
if (r == 0 && copy_passwd (pwbuf, &_pwbuf) == -1)
r = errno = ENOMEM;
free (buf);
return r;
}
#endif /* ndef HAVE_GETPWNAM_R */
#ifdef HAVE_GETPWUID_R
gint32
Mono_Posix_Syscall_getpwuid_r (mph_uid_t uid,
struct Mono_Posix_Syscall__Passwd *pwbuf,
struct passwd **pwbufp)
{
char *buf, *buf2;
size_t buflen;
int r;
struct passwd _pwbuf;
if (pwbuf == NULL) {
errno = EFAULT;
return -1;
}
buf = buf2 = NULL;
buflen = 2;
do {
buf2 = realloc (buf, buflen *= 2);
if (buf2 == NULL) {
free (buf);
errno = ENOMEM;
return -1;
}
buf = buf2;
} while ((r = getpwuid_r (uid, &_pwbuf, buf, buflen, pwbufp)) &&
recheck_range (r));
if (r == 0 && copy_passwd (pwbuf, &_pwbuf) == -1)
r = errno = ENOMEM;
free (buf);
return r;
}
#endif /* ndef HAVE_GETPWUID_R */
gint32
Mono_Posix_Syscall_getpwent (struct Mono_Posix_Syscall__Passwd *pwbuf)
{
struct passwd *pw;
if (pwbuf == NULL) {
errno = EFAULT;
return -1;
}
pw = getpwent ();
if (pw == NULL)
return -1;
if (copy_passwd (pwbuf, pw) == -1) {
errno = ENOMEM;
return -1;
}
return 0;
}
#ifdef HAVE_FGETPWENT
gint32
Mono_Posix_Syscall_fgetpwent (FILE *stream, struct Mono_Posix_Syscall__Passwd *pwbuf)
{
struct passwd *pw;
if (pwbuf == NULL) {
errno = EFAULT;
return -1;
}
pw = fgetpwent (stream);
if (pw == NULL)
return -1;
if (copy_passwd (pwbuf, pw) == -1) {
errno = ENOMEM;
return -1;
}
return 0;
}
#endif /* ndef HAVE_FGETPWENT */
G_END_DECLS
/*
* vim: noexpandtab
*/
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