Add tool to relay the syslog from a device to stdout

[#30]

Signed-off-by: Matt Colyer <matt@colyer.name>

dev/syslog_relay.c

diff --git a/dev/syslog_relay.c b/dev/syslog_relay.c
new file mode 100644
index 0000000..56cf56c
--- /dev/null
+++ b/dev/syslog_relay.c
@@ -0,0 +1,159 @@
+/*
+ * syslog_relay.c
+ * Relay the syslog of a device to stdout
+ *
+ * Copyright (c) 2009 Martin Szulecki All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA 
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <usb.h>
+
+#include <libiphone/libiphone.h>
+
+static int quit_flag = 0;
+
+void print_usage(int argc, char **argv);
+
+/**
+ * signal handler function for cleaning up properly
+ */
+static void clean_exit(int sig)
+{
+	fprintf(stderr, "Exiting...\n");
+	quit_flag++;
+}
+
+int main(int argc, char *argv[])
+{
+	iphone_lckd_client_t control = NULL;
+	iphone_device_t phone = NULL;
+	iphone_error_t ret = IPHONE_E_UNKNOWN_ERROR;
+	int i;
+	int bus_n = -1, dev_n = -1;
+	int port = 0;
+
+	signal(SIGINT, clean_exit);
+	signal(SIGQUIT, clean_exit);
+	signal(SIGTERM, clean_exit);
+	signal(SIGPIPE, SIG_IGN);
+
+	/* parse cmdline args */
+	for (i = 1; i < argc; i++) {
+		if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--debug")) {
+			iphone_set_debug_mask(DBGMASK_ALL);
+			continue;
+		}
+		else if (!strcmp(argv[i], "-u") || !strcmp(argv[i], "--usb")) {
+			if (sscanf(argv[++i], "%d,%d", &bus_n, &dev_n) < 2) {
+				print_usage(argc, argv);
+				return 0;
+			}
+			continue;
+		}
+		else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
+			print_usage(argc, argv);
+			return 0;
+		}
+		else {
+			print_usage(argc, argv);
+			return 0;
+		}
+	}
+
+	if (bus_n != -1) {
+		ret = iphone_get_specific_device(bus_n, dev_n, &phone);
+		if (ret != IPHONE_E_SUCCESS) {
+			printf("No device found for usb bus %d and dev %d, is it plugged in?\n", bus_n, dev_n);
+			return -1;
+		}
+	}
+	else
+	{
+		ret = iphone_get_device(&phone);
+		if (ret != IPHONE_E_SUCCESS) {
+			printf("No device found, is it plugged in?\n");
+			return -1;
+		}
+	}
+
+	if (IPHONE_E_SUCCESS != iphone_lckd_new_client(phone, &control)) {
+		iphone_free_device(phone);
+		return -1;
+	}
+
+	/* start syslog_relay service and retrieve port */
+	ret = iphone_lckd_start_service(control, "com.apple.syslog_relay", &port);
+	if ((ret == IPHONE_E_SUCCESS) && port) {
+		/* connect to socket relay messages */
+		iphone_umux_client_t syslog_client = NULL;
+		
+		ret = iphone_mux_new_client(phone, 514, port, &syslog_client);
+		if (ret == IPHONE_E_SUCCESS) {
+			while (!quit_flag) {
+				char *receive = NULL;
+				uint32_t datalen = 0, bytes = 0, recv_bytes = 0;
+
+				ret = iphone_mux_recv(syslog_client, (char *) &datalen, sizeof(datalen), &bytes);
+				datalen = ntohl(datalen);
+
+				if (datalen == 0)
+					continue;
+
+				recv_bytes += bytes;
+				receive = (char *) malloc(sizeof(char) * datalen);
+
+				while (!quit_flag && (recv_bytes <= datalen)) {
+					ret = iphone_mux_recv(syslog_client, receive, datalen, &bytes);
+
+					if (bytes == 0)
+						break;
+
+					recv_bytes += bytes;
+
+					fwrite(receive, sizeof(char), bytes, stdout);
+				}
+
+				free(receive);
+			}
+		} else {
+			printf("ERROR: Could not open usbmux connection.\n");
+		}
+		iphone_mux_free_client(syslog_client);
+	} else {
+		printf("ERROR: Could not start service com.apple.syslog_relay.\n");
+	}
+
+	iphone_lckd_free_client(control);
+	iphone_free_device(phone);
+
+	return 0;
+}
+
+void print_usage(int argc, char **argv)
+{
+	printf("Usage: %s [OPTIONS]\n", (strrchr(argv[0], '/') + 1));
+	printf("Relay syslog of a connected iPhone/iPod Touch.\n\n");
+	printf("  -d, --debug\t\tenable communication debugging\n");
+	printf("  -u, --usb=BUS,DEV\ttarget specific device by usb bus/dev number\n");
+	printf("  -h, --help\t\tprints usage information\n");
+	printf("\n");
+}
+