From 219e6bcae2ab93cd98bd352b62fb0f9d21051344 Mon Sep 17 00:00:00 2001
From: Adrien Guinet
Date: Wed, 2 Aug 2017 01:56:29 -0700
Subject: tools: Add new tool 'icat'

---
 tools/Makefile.am |   7 ++-
 tools/icat.c      | 148 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+), 1 deletion(-)
 create mode 100644 tools/icat.c

diff --git a/tools/Makefile.am b/tools/Makefile.am
index 40fa851..e232b66 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,10 +1,15 @@
 AM_CFLAGS = $(GLOBAL_CFLAGS) -I$(top_srcdir)/common -I$(top_srcdir)/src -I$(top_srcdir)/include
 AM_LDFLAGS = $(libpthread_LIBS)
 
-bin_PROGRAMS = iproxy
+bin_PROGRAMS = iproxy icat
 
 iproxy_SOURCES = iproxy.c
 iproxy_CFLAGS = $(AM_CFLAGS)
 iproxy_LDFLAGS = $(AM_LDFLAGS)
 iproxy_LDADD = $(top_builddir)/src/libusbmuxd.la $(top_builddir)/common/libinternalcommon.la
 
+icat_SOURCES = icat.c
+icat_CFLAGS = $(AM_CFLAGS)
+icat_LDFLAGS = $(AM_LDFLAGS)
+icat_LDADD = $(top_builddir)/src/libusbmuxd.la $(top_builddir)/common/libinternalcommon.la
+
diff --git a/tools/icat.c b/tools/icat.c
new file mode 100644
index 0000000..9296a23
--- /dev/null
+++ b/tools/icat.c
@@ -0,0 +1,148 @@
+/*
+ * icat.c -- simple netcat-like tool that enables service access to iOS devices
+ *
+ * Copyright (C) 2017 Adrien Guinet <adrien@guinet.me>
+ *
+ * Based on iproxy which is based upon iTunnel source code, Copyright (c)
+ * 2008 Jing Su.  http://www.cs.toronto.edu/~jingsu/itunnel/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/ioctl.h>
+
+#include "usbmuxd.h"
+
+static size_t read_data_socket(int fd, uint8_t* buf, size_t bufsize)
+{
+    size_t bytesavailable;
+    if (ioctl(fd, FIONREAD, &bytesavailable) != 0) {
+        perror("ioctl FIONREAD failed");
+        exit(1);
+    }
+    size_t bufread = (bytesavailable >= bufsize) ? bufsize:bytesavailable;
+    ssize_t ret = read(fd, buf, bufread);
+    if (ret < 0) {
+        perror("read failed");
+        exit(1);
+    }
+    return (size_t)ret;
+}
+
+int main(int argc, char **argv)
+{
+    if (argc < 2) {
+        printf("usage: %s DEVICE_TCP_PORT [UDID]\n", argv[0]);
+        return 1;
+    }
+
+    int device_port = atoi(argv[1]);
+    char* device_udid = NULL;
+
+    if (argc > 2) {
+        device_udid = argv[2];
+    }
+
+    if (!device_port) {
+        fprintf(stderr, "Invalid device_port specified!\n");
+        return -EINVAL;
+    }
+
+    usbmuxd_device_info_t *dev_list = NULL;
+    int count;
+    if ((count = usbmuxd_get_device_list(&dev_list)) < 0) {
+        printf("Connecting to usbmuxd failed, terminating.\n");
+        free(dev_list);
+        return 1;
+    }
+
+    if (dev_list == NULL || dev_list[0].handle == 0) {
+        fprintf(stderr, "No connected device found, terminating.\n");
+        free(dev_list);
+        return 1;
+    }
+
+    usbmuxd_device_info_t *dev = NULL;
+    if (device_udid) {
+        int i;
+        for (i = 0; i < count; i++) {
+            if (strncmp(dev_list[i].udid, device_udid, sizeof(dev_list[0].udid)) == 0) {
+                dev = &(dev_list[i]);
+                break;
+            }
+        }
+    } else {
+        dev = &(dev_list[0]);
+    }
+
+    if (dev == NULL || dev->handle == 0) {
+        fprintf(stderr, "No connected/matching device found, disconnecting client.\n");
+        free(dev_list);
+        return 1;
+    }
+
+    int devfd = usbmuxd_connect(dev->handle, device_port);
+    free(dev_list);
+    if (devfd < 0) {
+        fprintf(stderr, "Error connecting to device!\n");
+        return 1;
+    }
+
+    fd_set fds;
+    FD_ZERO(&fds);
+    FD_SET(STDIN_FILENO, &fds);
+    FD_SET(devfd, &fds);
+
+    int ret = 0;
+    uint8_t buf[4096];
+    while (1) {
+        fd_set read_fds = fds;
+        int ret_sel = select(devfd+1, &read_fds, NULL, NULL, NULL);
+        if (ret_sel < 0) {
+            perror("select");
+            ret = 1;
+            break;
+        }
+
+        if (FD_ISSET(STDIN_FILENO, &read_fds)) {
+            size_t n = read_data_socket(STDIN_FILENO, buf, sizeof(buf));
+            if (n == 0) {
+                break;
+            }
+            write(devfd, buf, n);
+        }
+
+        if (FD_ISSET(devfd, &read_fds)) {
+            size_t n = read_data_socket(devfd, buf, sizeof(buf));
+            if (n == 0) {
+                break;
+            }
+            write(STDOUT_FILENO, buf, n);
+        }
+    }
+
+    close(devfd);
+    return ret;
+}
-- 
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