#include <errno.h>
#endif
-/* import from utmp.c
- * XXX: FIXME: provide empty bodies if ENABLE_FEATURE_UTMP == 0
- */
-static struct utmp utent;
-static void read_or_build_utent(int);
-static void write_utent(const char *);
-
enum {
TIMEOUT = 60,
EMPTY_USERNAME_COUNT = 10,
TTYNAME_SIZE = 32,
};
-static void die_if_nologin_and_non_root(int amroot);
+static char full_tty[TTYNAME_SIZE];
+static char* short_tty = full_tty;
+
+#if ENABLE_FEATURE_UTMP
+/* vv Taken from tinylogin utmp.c vv */
+/*
+ * read_or_build_utent - see if utmp file is correct for this process
+ *
+ * System V is very picky about the contents of the utmp file
+ * and requires that a slot for the current process exist.
+ * The utmp file is scanned for an entry with the same process
+ * ID. If no entry exists the process exits with a message.
+ *
+ * The "picky" flag is for network and other logins that may
+ * use special flags. It allows the pid checks to be overridden.
+ * This means that getty should never invoke login with any
+ * command line flags.
+ */
+static struct utmp utent;
+static void read_or_build_utent(int picky)
+{
+ struct utmp *ut;
+ pid_t pid = getpid();
+
+ setutent();
+
+ /* First, try to find a valid utmp entry for this process. */
+ while ((ut = getutent()))
+ if (ut->ut_pid == pid && ut->ut_line[0] && ut->ut_id[0] &&
+ (ut->ut_type == LOGIN_PROCESS || ut->ut_type == USER_PROCESS))
+ break;
+
+ /* If there is one, just use it, otherwise create a new one. */
+ if (ut) {
+ utent = *ut;
+ } else {
+ if (picky)
+ bb_error_msg_and_die("no utmp entry found");
+
+ memset(&utent, 0, sizeof(utent));
+ utent.ut_type = LOGIN_PROCESS;
+ utent.ut_pid = pid;
+ strncpy(utent.ut_line, short_tty, sizeof(utent.ut_line));
+ /* This one is only 4 chars wide. Try to fit something
+ * remotely meaningful by skipping "tty"... */
+ strncpy(utent.ut_id, short_tty + 3, sizeof(utent.ut_id));
+ strncpy(utent.ut_user, "LOGIN", sizeof(utent.ut_user));
+ utent.ut_time = time(NULL);
+ }
+ if (!picky) /* root login */
+ memset(utent.ut_host, 0, sizeof(utent.ut_host));
+}
+
+/*
+ * write_utent - put a USER_PROCESS entry in the utmp file
+ *
+ * write_utent changes the type of the current utmp entry to
+ * USER_PROCESS. the wtmp file will be updated as well.
+ */
+static void write_utent(const char *username)
+{
+ utent.ut_type = USER_PROCESS;
+ strncpy(utent.ut_user, username, sizeof(utent.ut_user));
+ utent.ut_time = time(NULL);
+ /* other fields already filled in by read_or_build_utent above */
+ setutent();
+ pututline(&utent);
+ endutent();
+#if ENABLE_FEATURE_WTMP
+ if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
+ close(creat(bb_path_wtmp_file, 0664));
+ }
+ updwtmp(bb_path_wtmp_file, &utent);
+#endif
+}
+#else /* !CONFIG_FEATURE_UTMP */
+static inline void read_or_build_utent(int) {}
+static inline void write_utent(const char *) {}
+#endif /* !CONFIG_FEATURE_UTMP */
+
+static void die_if_nologin_and_non_root(int amroot)
+{
+ FILE *fp;
+ int c;
+
+ if (access(bb_path_nologin_file, F_OK))
+ return;
+
+ fp = fopen(bb_path_nologin_file, "r");
+ if (fp) {
+ while ((c = getc(fp)) != EOF)
+ putchar((c=='\n') ? '\r' : c);
+ fflush(stdout);
+ fclose(fp);
+ } else
+ puts("\r\nSystem closed for routine maintenance\r");
+ if (!amroot)
+ exit(1);
+ puts("\r\n[Disconnect bypassed -- root login allowed.]\r");
+}
#if ENABLE_FEATURE_SECURETTY
-static int check_securetty(void);
+static int check_securetty(void)
+{
+ FILE *fp;
+ int i;
+ char buf[BUFSIZ];
+
+ fp = fopen(bb_path_securetty_file, "r");
+ if (!fp) {
+ /* A missing securetty file is not an error. */
+ return 1;
+ }
+ while (fgets(buf, sizeof(buf)-1, fp)) {
+ for(i = strlen(buf)-1; i>=0; --i) {
+ if (!isspace(buf[i]))
+ break;
+ }
+ buf[++i] = '\0';
+ if ((buf[0]=='\0') || (buf[0]=='#'))
+ continue;
+ if (strcmp(buf, short_tty) == 0) {
+ fclose(fp);
+ return 1;
+ }
+ }
+ fclose(fp);
+ return 0;
+}
#else
static inline int check_securetty(void) { return 1; }
#endif
-static void get_username_or_die(char *buf, int size_buf);
-static void motd(void);
+static void get_username_or_die(char *buf, int size_buf)
+{
+ int c, cntdown;
+ cntdown = EMPTY_USERNAME_COUNT;
+prompt:
+ /* skip whitespace */
+ print_login_prompt();
+ do {
+ c = getchar();
+ if (c == EOF) exit(1);
+ if (c == '\n') {
+ if (!--cntdown) exit(1);
+ goto prompt;
+ }
+ } while (isspace(c));
+
+ *buf++ = c;
+ if (!fgets(buf, size_buf-2, stdin))
+ exit(1);
+ if (!strchr(buf, '\n'))
+ exit(1);
+ while (isgraph(*buf)) buf++;
+ *buf = '\0';
+}
+
+static void motd(void)
+{
+ FILE *fp;
+ int c;
+
+ fp = fopen(bb_path_motd_file, "r");
+ if (fp) {
+ while ((c = getc(fp)) != EOF)
+ putchar(c);
+ fclose(fp);
+ }
+}
static void nonblock(int fd)
{
exit(EXIT_SUCCESS);
}
-
-static char full_tty[TTYNAME_SIZE];
-static char* short_tty = full_tty;
-
-
int login_main(int argc, char **argv)
{
char fromhost[512];
short_tty = full_tty + 5;
}
- if (ENABLE_FEATURE_UTMP) {
- read_or_build_utent(!amroot);
- if (amroot)
- memset(utent.ut_host, 0, sizeof(utent.ut_host));
- }
+ read_or_build_utent(!amroot);
if (opt_host) {
if (ENABLE_FEATURE_UTMP)
alarm(0);
die_if_nologin_and_non_root(pw->pw_uid == 0);
- if (ENABLE_FEATURE_UTMP)
- write_utent(username);
+ write_utent(username);
#ifdef CONFIG_SELINUX
if (is_selinux_enabled()) {
return EXIT_FAILURE;
}
-
-
-static void get_username_or_die(char *buf, int size_buf)
-{
- int c, cntdown;
- cntdown = EMPTY_USERNAME_COUNT;
-prompt:
- /* skip whitespace */
- print_login_prompt();
- do {
- c = getchar();
- if (c == EOF) exit(1);
- if (c == '\n') {
- if (!--cntdown) exit(1);
- goto prompt;
- }
- } while (isspace(c));
-
- *buf++ = c;
- if (!fgets(buf, size_buf-2, stdin))
- exit(1);
- if (!strchr(buf, '\n'))
- exit(1);
- while (isgraph(*buf)) buf++;
- *buf = '\0';
-}
-
-
-static void die_if_nologin_and_non_root(int amroot)
-{
- FILE *fp;
- int c;
-
- if (access(bb_path_nologin_file, F_OK))
- return;
-
- fp = fopen(bb_path_nologin_file, "r");
- if (fp) {
- while ((c = getc(fp)) != EOF)
- putchar((c=='\n') ? '\r' : c);
- fflush(stdout);
- fclose(fp);
- } else
- puts("\r\nSystem closed for routine maintenance\r");
- if (!amroot)
- exit(1);
- puts("\r\n[Disconnect bypassed -- root login allowed.]\r");
-}
-
-#if ENABLE_FEATURE_SECURETTY
-
-static int check_securetty(void)
-{
- FILE *fp;
- int i;
- char buf[BUFSIZ];
-
- fp = fopen(bb_path_securetty_file, "r");
- if (!fp) {
- /* A missing securetty file is not an error. */
- return 1;
- }
- while (fgets(buf, sizeof(buf)-1, fp)) {
- for(i = strlen(buf)-1; i>=0; --i) {
- if (!isspace(buf[i]))
- break;
- }
- buf[++i] = '\0';
- if ((buf[0]=='\0') || (buf[0]=='#'))
- continue;
- if (strcmp(buf, short_tty) == 0) {
- fclose(fp);
- return 1;
- }
- }
- fclose(fp);
- return 0;
-}
-
-#endif
-
-static void motd(void)
-{
- FILE *fp;
- int c;
-
- fp = fopen(bb_path_motd_file, "r");
- if (fp) {
- while ((c = getc(fp)) != EOF)
- putchar(c);
- fclose(fp);
- }
-}
-
-
-#if ENABLE_FEATURE_UTMP
-/* vv Taken from tinylogin utmp.c vv */
-
-/*
- * read_or_build_utent - see if utmp file is correct for this process
- *
- * System V is very picky about the contents of the utmp file
- * and requires that a slot for the current process exist.
- * The utmp file is scanned for an entry with the same process
- * ID. If no entry exists the process exits with a message.
- *
- * The "picky" flag is for network and other logins that may
- * use special flags. It allows the pid checks to be overridden.
- * This means that getty should never invoke login with any
- * command line flags.
- */
-
-static void read_or_build_utent(int picky)
-{
- struct utmp *ut;
- pid_t pid = getpid();
-
- setutent();
-
- /* First, try to find a valid utmp entry for this process. */
- while ((ut = getutent()))
- if (ut->ut_pid == pid && ut->ut_line[0] && ut->ut_id[0] &&
- (ut->ut_type == LOGIN_PROCESS || ut->ut_type == USER_PROCESS))
- break;
-
- /* If there is one, just use it, otherwise create a new one. */
- if (ut) {
- utent = *ut;
- } else {
- if (picky)
- bb_error_msg_and_die("no utmp entry found");
-
- memset(&utent, 0, sizeof(utent));
- utent.ut_type = LOGIN_PROCESS;
- utent.ut_pid = pid;
- strncpy(utent.ut_line, short_tty, sizeof(utent.ut_line));
- /* This one is only 4 chars wide. Try to fit something
- * remotely meaningful by skipping "tty"... */
- strncpy(utent.ut_id, short_tty + 3, sizeof(utent.ut_id));
- strncpy(utent.ut_user, "LOGIN", sizeof(utent.ut_user));
- utent.ut_time = time(NULL);
- }
-}
-
-/*
- * write_utent - put a USER_PROCESS entry in the utmp file
- *
- * write_utent changes the type of the current utmp entry to
- * USER_PROCESS. the wtmp file will be updated as well.
- */
-
-static void write_utent(const char *username)
-{
- utent.ut_type = USER_PROCESS;
- strncpy(utent.ut_user, username, sizeof(utent.ut_user));
- utent.ut_time = time(NULL);
- /* other fields already filled in by read_or_build_utent above */
- setutent();
- pututline(&utent);
- endutent();
-#if ENABLE_FEATURE_WTMP
- if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
- close(creat(bb_path_wtmp_file, 0664));
- }
- updwtmp(bb_path_wtmp_file, &utent);
-#endif
-}
-#endif /* CONFIG_FEATURE_UTMP */
projects / oweals / busybox.git / commitdiff