1 files changed, 296 insertions, 0 deletions
diff --git a/busybox/debianutils/start_stop_daemon.c b/busybox/debianutils/start_stop_daemon.c
new file mode 100644
index 0000000..e15944c
--- /dev/null
+++ b/busybox/debianutils/start_stop_daemon.c
@@ -0,0 +1,296 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini start-stop-daemon implementation(s) for busybox
+ *
+ * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
+ * public domain.
+ * Adapted for busybox David Kimdon <dwhedon@gordian.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#include "busybox.h"
+#include "pwd_.h"
+
+static int signal_nr = 15;
+static int user_id = -1;
+static int quiet = 0;
+static char *userspec = NULL;
+static char *cmdname = NULL;
+static char *execname = NULL;
+static char *pidfile = NULL;
+
+struct pid_list {
+	struct pid_list *next;
+	pid_t pid;
+};
+
+static struct pid_list *found = NULL;
+
+static inline void
+push(pid_t pid)
+{
+	struct pid_list *p;
+
+	p = xmalloc(sizeof(*p));
+	p->next = found;
+	p->pid = pid;
+	found = p;
+}
+
+static int
+pid_is_exec(pid_t pid, const char *name)
+{
+	char buf[32];
+	struct stat sb, exec_stat;
+
+	if (name && stat(name, &exec_stat))
+		bb_perror_msg_and_die("stat %s", name);
+
+	sprintf(buf, "/proc/%d/exe", pid);
+	if (stat(buf, &sb) != 0)
+		return 0;
+	return (sb.st_dev == exec_stat.st_dev && sb.st_ino == exec_stat.st_ino);
+}
+
+static int
+pid_is_user(int pid, int uid)
+{
+	struct stat sb;
+	char buf[32];
+
+	sprintf(buf, "/proc/%d", pid);
+	if (stat(buf, &sb) != 0)
+		return 0;
+	return (sb.st_uid == uid);
+}
+
+static int
+pid_is_cmd(pid_t pid, const char *name)
+{
+	char buf[32];
+	FILE *f;
+	int c;
+
+	sprintf(buf, "/proc/%d/stat", pid);
+	f = fopen(buf, "r");
+	if (!f)
+		return 0;
+	while ((c = getc(f)) != EOF && c != '(')
+		;
+	if (c != '(') {
+		fclose(f);
+		return 0;
+	}
+	/* this hopefully handles command names containing ')' */
+	while ((c = getc(f)) != EOF && c == *name)
+		name++;
+	fclose(f);
+	return (c == ')' && *name == '\0');
+}
+
+
+static void
+check(int pid)
+{
+	if (execname && !pid_is_exec(pid, execname)) {
+		return;
+	}
+	if (userspec && !pid_is_user(pid, user_id)) {
+		return;
+	}
+	if (cmdname && !pid_is_cmd(pid, cmdname)) {
+		return;
+	}
+	push(pid);
+}
+
+
+static void
+do_pidfile(void)
+{
+	FILE *f;
+	pid_t pid;
+
+	f = fopen(pidfile, "r");
+	if (f) {
+		if (fscanf(f, "%d", &pid) == 1)
+			check(pid);
+		fclose(f);
+	} else if (errno != ENOENT)
+		bb_perror_msg_and_die("open pidfile %s", pidfile);
+
+}
+
+static void
+do_procinit(void)
+{
+	DIR *procdir;
+	struct dirent *entry;
+	int foundany, pid;
+
+	if (pidfile) {
+		do_pidfile();
+		return;
+	}
+
+	procdir = opendir("/proc");
+	if (!procdir)
+		bb_perror_msg_and_die ("opendir /proc");
+
+	foundany = 0;
+	while ((entry = readdir(procdir)) != NULL) {
+		if (sscanf(entry->d_name, "%d", &pid) != 1)
+			continue;
+		foundany++;
+		check(pid);
+	}
+	closedir(procdir);
+	if (!foundany)
+		bb_error_msg_and_die ("nothing in /proc - not mounted?");
+}
+
+
+static void
+do_stop(void)
+{
+	char what[1024];
+	struct pid_list *p;
+	int killed = 0;
+
+	do_procinit();
+
+	if (cmdname)
+		strcpy(what, cmdname);
+	else if (execname)
+		strcpy(what, execname);
+	else if (pidfile)
+		sprintf(what, "process in pidfile `%.200s'", pidfile);
+	else if (userspec)
+		sprintf(what, "process(es) owned by `%s'", userspec);
+	else
+		bb_error_msg_and_die ("internal error, please report");
+
+	if (!found) {
+		if (!quiet)
+			printf("no %s found; none killed.\n", what);
+		return;
+	}
+	for (p = found; p; p = p->next) {
+		if (kill(p->pid, signal_nr) == 0) {
+			p->pid = -p->pid;
+			killed++;
+		} else {
+			bb_perror_msg("warning: failed to kill %d", p->pid);
+		}
+	}
+	if (!quiet && killed) {
+		printf("stopped %s (pid", what);
+		for (p = found; p; p = p->next)
+			if(p->pid < 0)
+				printf(" %d", -p->pid);
+		printf(").\n");
+	}
+}
+
+
+static const struct option ssd_long_options[] = {
+	{ "stop",				0,		NULL,		'K' },
+	{ "start",				0,		NULL,		'S' },
+	{ "background",			0,		NULL,		'b' },
+	{ "quiet",				0,		NULL,		'q' },
+	{ "make-pidfile",		0,		NULL,		'm' },
+	{ "startas",			1,		NULL,		'a' },
+	{ "name",				1,		NULL,		'n' },
+	{ "signal",				1,		NULL,		's' },
+	{ "user",				1,		NULL,		'u' },
+	{ "exec",				1,		NULL,		'x' },
+	{ "pidfile",			1,		NULL,		'p' },
+	{ 0,			0,		0,			0 }
+};
+
+#define SSD_CTX_STOP		1
+#define SSD_CTX_START		2
+#define SSD_OPT_BACKGROUND	4
+#define SSD_OPT_QUIET		8
+#define SSD_OPT_MAKEPID		16
+
+int
+start_stop_daemon_main(int argc, char **argv)
+{
+	unsigned long opt;
+	char *signame = NULL;
+	char *startas = NULL;
+
+	bb_applet_long_options = ssd_long_options;
+
+	bb_opt_complementaly = "K~S:S~K";
+	opt = bb_getopt_ulflags(argc, argv, "KSbqma:n:s:u:x:p:",
+			&startas, &cmdname, &signame, &userspec, &execname, &pidfile);
+
+	/* Check one and only one context option was given */
+	if ((opt & 0x80000000UL) || (opt & (SSD_CTX_STOP | SSD_CTX_START)) == 0) {
+		bb_show_usage();
+	}
+
+	if (signame) {
+		signal_nr = bb_xgetlarg(signame, 10, 0, NSIG);
+	}
+
+	if (!execname && !pidfile && !userspec && !cmdname)
+		bb_error_msg_and_die ("need at least one of -x, -p, -u, or -n");
+
+	if (!startas)
+		startas = execname;
+
+	if ((opt & SSD_CTX_START) && !startas)
+		bb_error_msg_and_die ("-S needs -x or -a");
+
+	if ((opt & SSD_OPT_MAKEPID) && pidfile == NULL)
+		bb_error_msg_and_die ("-m needs -p");
+
+	argc -= optind;
+	argv += optind;
+
+	if (userspec && sscanf(userspec, "%d", &user_id) != 1)
+		user_id = my_getpwnam(userspec);
+
+	if (opt & SSD_CTX_STOP) {
+		do_stop();
+		return EXIT_SUCCESS;
+	}
+
+	do_procinit();
+
+	if (found) {
+		if (!quiet)
+			printf("%s already running.\n%d\n", execname ,found->pid);
+		return EXIT_SUCCESS;
+	}
+	*--argv = startas;
+	if (opt & SSD_OPT_BACKGROUND) {
+		if (daemon(0, 0) == -1)
+			bb_perror_msg_and_die ("unable to fork");
+		setsid();
+	}
+	if (opt & SSD_OPT_MAKEPID) {
+		/* user wants _us_ to make the pidfile */
+		FILE *pidf = fopen(pidfile, "w");
+		pid_t pidt = getpid();
+		if (pidf == NULL)
+			bb_perror_msg_and_die("Unable to write pidfile '%s'", pidfile);
+		fprintf(pidf, "%d\n", pidt);
+		fclose(pidf);
+	}
+	execv(startas, argv);
+	bb_perror_msg_and_die ("unable to start %s", startas);
+}