From: Mike Lowis <mike.lowis@gentex.com>
Date: Tue, 26 Apr 2016 20:38:34 +0000 (-0400)
Subject: Checkin suckless versions of login and dmesg for the time being
X-Git-Url: https://git.mdlowis.com/?a=commitdiff_plain;h=84840b9be7a3e50d0f5772d670844ddd25f3c0f9;p=proto%2Falbase.git

Checkin suckless versions of login and dmesg for the time being
---

diff --git a/source/dmesg.c b/source/dmesg.c
new file mode 100644
index 00000000..fff14615
--- /dev/null
+++ b/source/dmesg.c
@@ -0,0 +1,81 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/klog.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "util.h"
+
+enum {
+	SYSLOG_ACTION_READ_ALL = 3,
+	SYSLOG_ACTION_CLEAR = 5,
+	SYSLOG_ACTION_CONSOLE_LEVEL = 8,
+	SYSLOG_ACTION_SIZE_BUFFER = 10
+};
+
+static void
+dmesg_show(const void *buf, size_t n)
+{
+	const char *p = buf;
+	ssize_t r;
+
+	r = write(1, p, n);
+	if (r < 0)
+		eprintf("write:");
+	if (r > 0 && p[r - 1] != '\n')
+		putchar('\n');
+}
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-Ccr] [-n level]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int n;
+	char *buf;
+	int cflag = 0;
+	long level;
+
+	ARGBEGIN {
+	case 'C':
+		if (klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
+			eprintf("klogctl:");
+		return 0;
+	case 'c':
+		cflag = 1;
+		break;
+	case 'r':
+		break;
+	case 'n':
+		level = estrtol(EARGF(usage()), 10);
+		if (klogctl(SYSLOG_ACTION_CONSOLE_LEVEL, NULL, level) < 0)
+			eprintf("klogctl:");
+		return 0;
+	default:
+		usage();
+	} ARGEND;
+
+	n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0);
+	if (n < 0)
+		eprintf("klogctl:");
+
+	buf = emalloc(n);
+
+	n = klogctl(SYSLOG_ACTION_READ_ALL, buf, n);
+	if (n < 0)
+		eprintf("klogctl:");
+
+	dmesg_show(buf, n);
+
+	if (cflag && klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
+		eprintf("klogctl:");
+
+	free(buf);
+	return 0;
+}
\ No newline at end of file
diff --git a/source/login.c b/source/login.c
new file mode 100644
index 00000000..25a59e48
--- /dev/null
+++ b/source/login.c
@@ -0,0 +1,130 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+#include <errno.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <utmp.h>
+
+#include "config.h"
+#include "passwd.h"
+#include "util.h"
+
+/* Write utmp entry */
+static void
+writeutmp(const char *user, const char *tty)
+{
+	struct utmp usr;
+	FILE *fp;
+
+	memset(&usr, 0, sizeof(usr));
+
+	usr.ut_type = USER_PROCESS;
+	usr.ut_pid = getpid();
+	strlcpy(usr.ut_user, user, sizeof(usr.ut_user));
+	strlcpy(usr.ut_line, tty, sizeof(usr.ut_line));
+	usr.ut_tv.tv_sec = time(NULL);
+
+	fp = fopen(UTMP_PATH, "a");
+	if (fp) {
+		if (fwrite(&usr, sizeof(usr), 1, fp) != 1)
+			if (ferror(fp))
+				weprintf("%s: write error:", UTMP_PATH);
+		fclose(fp);
+	} else {
+		weprintf("fopen %s:", UTMP_PATH);
+	}
+}
+
+static int
+dologin(struct passwd *pw, int preserve)
+{
+	char *shell = pw->pw_shell[0] == '\0' ? "/bin/sh" : pw->pw_shell;
+
+	if (preserve == 0)
+		clearenv();
+	setenv("HOME", pw->pw_dir, 1);
+	setenv("SHELL", shell, 1);
+	setenv("USER", pw->pw_name, 1);
+	setenv("LOGNAME", pw->pw_name, 1);
+	setenv("PATH", ENV_PATH, 1);
+	if (chdir(pw->pw_dir) < 0)
+		eprintf("chdir %s:", pw->pw_dir);
+	execlp(shell, shell, "-l", NULL);
+	weprintf("execlp %s:", shell);
+	return (errno == ENOENT) ? 127 : 126;
+}
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-p] username\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct passwd *pw;
+	char *pass, *user;
+	char *tty;
+	uid_t uid;
+	gid_t gid;
+	int pflag = 0;
+
+	ARGBEGIN {
+	case 'p':
+		pflag = 1;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc < 1)
+		usage();
+
+	if (isatty(0) == 0 || isatty(1) == 0 || isatty(2) == 0)
+		eprintf("no tty");
+
+	user = argv[0];
+	errno = 0;
+	pw = getpwnam(user);
+	if (!pw) {
+		if (errno)
+			eprintf("getpwnam %s:", user);
+		else
+			eprintf("who are you?\n");
+	}
+
+	uid = pw->pw_uid;
+	gid = pw->pw_gid;
+
+	/* Flush pending input */
+	ioctl(0, TCFLSH, (void *)0);
+
+	pass = getpass("Password: ");
+	if (!pass)
+		eprintf("getpass:");
+	if (pw_check(pw, pass) <= 0)
+		exit(1);
+
+	tty = ttyname(0);
+	if (!tty)
+		eprintf("ttyname:");
+
+	writeutmp(user, tty);
+
+	if (initgroups(user, gid) < 0)
+		eprintf("initgroups:");
+	if (setgid(gid) < 0)
+		eprintf("setgid:");
+	if (setuid(uid) < 0)
+		eprintf("setuid:");
+
+	return dologin(pw, pflag);
+}