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passwd + /etc/shadow: chage "change time" field too

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function                                             old     new   delta
update_passwd                                       1171    1270     +99

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2009-07-13 01:15:30 +02:00
parent 044b18083b
commit 189f74d0f2
2 changed files with 31 additions and 4 deletions
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22
libbb/update_passwd.c
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@@ -87,6 +87,12 @@ int FAST_FUNC update_passwd(const char *filename,
int i;
int changed_lines;
int ret = -1; /* failure */
/* used as a bool: "are we modifying /etc/shadow?" */
#if ENABLE_FEATURE_SHADOWPASSWDS
const char *shadow = strstr(filename, "shadow");
#else
# define shadow NULL
#endif
filename = xmalloc_follow_symlinks(filename);
if (filename == NULL)
@@ -100,7 +106,7 @@ int FAST_FUNC update_passwd(const char *filename,
name = xasprintf("%s:", name);
user_len = strlen(name);
if (ENABLE_FEATURE_SHADOWPASSWDS && strstr(filename, "shadow"))
if (shadow)
old_fp = fopen(filename, "r+");
else
old_fp = fopen_or_warn(filename, "r+");
@@ -215,8 +221,18 @@ int FAST_FUNC update_passwd(const char *filename,
) {
/* Change passwd */
cp = strchrnul(cp, ':'); /* move past old passwd */
/* name: + new_passwd + :rest of line */
fprintf(new_fp, "%s%s%s\n", name, new_passwd, cp);
if (shadow && *cp == ':') {
/* /etc/shadow's field 3 (passwd change date) needs updating */
/* move past old change date */
cp = strchrnul(cp + 1, ':');
/* "name:" + "new_passwd" + ":" + "change date" + ":rest of line" */
fprintf(new_fp, "%s%s:%u%s\n", name, new_passwd,
(unsigned)(time(NULL)) / (24*60*60), cp);
} else {
/* "name:" + "new_passwd" + ":rest of line" */
fprintf(new_fp, "%s%s%s\n", name, new_passwd, cp);
}
changed_lines++;
} /* else delete user or group: skip the line */
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