发信人: kevintz(Geek)
整理人: arira(2001-06-05 12:34:36), 站内信件
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★原文转载自CLanguage版kevintz的《Re:[转载]：用C程序修改用户密码应该调用什么函数？》★
【 在 zeus_h 的大作中提到：】
:★原文转载自Linux版zeus_h的《用C程序修改用户密码应该调用什么函数？》★
:man passwd找不到结果。
:还可以MAN什么？
:
:......
下面是linux下passwd程序的源代码，is it easy ?
编译时连接 -lpam -lpam_misc
---------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/types.h>
#include <security/pam_appl.h>
#include <security/pam_misc.h>
/* ------ some static data objects ------- */
static struct pam_conv conv = {
misc_conv,
NULL
};
/* ------- the application itself -------- */
int main(int argc, char *argv[])
{
const char *user;
int just_expired, retval;
pam_handle_t *pamh=NULL;
if (argc > 3) {
fprintf(stderr, "usage: %s [-u] [username]\n"
"\tA program for changing the authentication tokens of\n"
"\ta user. Use -u to only change those tokens that have\n"
"\texpired\n"
, argv[0]);
exit(1);
}
just_expired = 0;
user = NULL;
if (argc >= 2)
if (!strcmp(argv[1],"-u")) {
just_expired = PAM_CHANGE_EXPIRED_AUTHTOK;
if (argc == 3)
user = argv[2];
} else if (argc == 3) {
fprintf(stderr,"usage: passwd [-u] [username]\n");
exit(1);
} else if (argc == 2)
user = argv[1];
if (user == NULL) {
if ((user = getlogin()) == NULL) {
fprintf(stderr, "passwd: cannot retrieve user's name\n");
exit(1);
}
} else if (getuid() != 0) {
fprintf(stderr, "passwd: only root can supply a user's name\n");
exit(1);
}
/* here we know whose passwords are to be changed and whether
we'll change everything or just the expired ones */
retval = pam_start("passwd", user, &conv, &pamh);
while (retval == PAM_SUCCESS) { /* use loop to avoid goto... */
/* the user is authenticated by the passwd module; change
the password(s) too. */
retval = pam_chauthtok(pamh, just_expired);
if (retval != PAM_SUCCESS)
break;
/* all done */
retval = pam_end(pamh, PAM_SUCCESS);
if (retval != PAM_SUCCESS)
break;
/* quit gracefully */
fprintf(stderr,
"passwd: %s authentication tokens updated successfully\n"
,just_expired ? "expired":"all" );
exit(0);
}
if (pamh != NULL)
(void) pam_end(pamh,PAM_SUCCESS);
if (retval != PAM_SUCCESS)
fprintf(stderr, "passwd: %s\n", pam_strerror(pamh,retval));
exit(1);
}
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