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Implement -l support for su(1)

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sin 2013-10-18 11:14:36 +01:00
parent f7bfe68a9e
commit 784c6a5acf
1 changed files with 47 additions and 3 deletions
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44
su.c
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@ -12,6 +12,9 @@
extern char **environ;
static char *msetenv(const char *, const char *);
static void dologin(struct passwd *);
static void
usage(void)
{
@ -93,8 +96,49 @@ main(int argc, char **argv)
if (setuid(pw->pw_uid) < 0)
eprintf("setuid:");
if (lflag) {
dologin(pw);
} else {
newargv = (char *const[]){pw->pw_shell, NULL};
setenv("HOME", pw->pw_dir, 1);
execve(pw->pw_shell, newargv, environ);
}
return (errno == ENOENT) ? 127 : 126;
}
static char *
msetenv(const char *name, const char *value)
{
char *buf;
size_t sz;
sz = strlen(name) + strlen(value) + 2;
buf = malloc(sz);
if (!buf)
eprintf("malloc:");
snprintf(buf, sz, "%s=%s", name, value);
return buf;
}
static void
dologin(struct passwd *pw)
{
char shbuf[strlen(pw->pw_shell) + 1];
char * const *newargv;
char * const *newenv;
strcpy(shbuf, pw->pw_shell);
newargv = (char *const[]){shbuf, NULL};
newenv = (char *const[]){
msetenv("HOME", pw->pw_dir),
msetenv("SHELL", pw->pw_shell),
msetenv("USER", pw->pw_name),
msetenv("LOGNAME", pw->pw_name),
msetenv("TERM", getenv("TERM")),
msetenv("PATH", getenv("PATH")),
NULL
};
if (chdir(pw->pw_dir) < 0)
eprintf("chdir %s:", pw->pw_dir);
execve(pw->pw_shell, newargv, newenv);
}