From f8141b55b230dd4c66b39cee843149bdabe13580 Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Thu, 21 May 2009 22:25:21 +0200
Subject: Added parameter -p to prevent usbmuxd from dropping privileges (see
 this as a workaround for systems where the usb device access is  restricted)

---
 src/main.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/main.c b/src/main.c
index 3617e14..9e99c1b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -57,6 +57,7 @@ static int fsock = -1;
 static int verbose = DEBUG_LEVEL;
 static int foreground = 0;
 static int exit_on_no_devices = 0;
+static int preserve_privileges = 0;
 
 struct device_info {
 	uint32_t device_id;
@@ -1009,9 +1010,11 @@ static int daemonize()
 static void usage()
 {
 	printf("usage: usbmuxd [options]\n");
-	printf("\t-h|--help        print this message.\n");
-	printf("\t-v|--verbose     be verbose\n");
-	printf("\t-f|--foreground  do not daemonize\n");
+	printf("\t-h|--help                 print this message\n");
+	printf("\t-v|--verbose              be verbose (use twice or more to increase)\n");
+	printf("\t-f|--foreground           do not daemonize\n");
+	printf("\t-e|--exit-on-no-devices   exit if no device is attached\n");
+	printf("\t-p|--preserve-privileges  do not drop privileges\n");
 	printf("\n");
 }
 
@@ -1022,12 +1025,13 @@ static void parse_opts(int argc, char **argv)
 		{"foreground", 0, NULL, 'f'},
 		{"verbose", 0, NULL, 'v'},
 		{"exit-on-no-devices", 0, NULL, 'e'},
+		{"preserve-privileges", 0, NULL, 'p'},
 		{NULL, 0, NULL, 0}
 	};
 	int c;
 
 	while (1) {
-		c = getopt_long(argc, argv, "hfve", longopts, (int *) 0);
+		c = getopt_long(argc, argv, "hfvep", longopts, (int *) 0);
 		if (c == -1) {
 			break;
 		}
@@ -1045,6 +1049,9 @@ static void parse_opts(int argc, char **argv)
 		case 'e':
 			exit_on_no_devices = 1;
 			break;
+		case 'p':
+			preserve_privileges = 1;
+			break;
 		default:
 			usage();
 			exit(2);
@@ -1198,7 +1205,7 @@ int main(int argc, char **argv)
 		}
 	}
 	// drop elevated privileges
-	if (getuid() == 0 || geteuid() == 0) {
+	if (!preserve_privileges && (getuid() == 0 || geteuid() == 0)) {
 		struct passwd *pw = getpwnam("nobody");
 		if (pw) {
 			setuid(pw->pw_uid);
-- 
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