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/*
usbmuxd - iPhone/iPod Touch USB multiplex server daemon
Copyright (C) 2009 Hector Martin "marcan" <hector@marcansoft.com>
Copyright (C) 2009 Nikias Bassen <nikias@gmx.li>
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 or version 3.
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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#ifdef HAVE_PLIST
#include <plist/plist.h>
#endif
#include "log.h"
#include "usb.h"
#include "client.h"
#include "device.h"
#ifdef HAVE_PLIST
#define CMD_BUF_SIZE 1024
#else
#define CMD_BUF_SIZE 256
#endif
#define REPLY_BUF_SIZE 1024
enum client_state {
CLIENT_COMMAND, // waiting for command
CLIENT_LISTEN, // listening for devices
CLIENT_CONNECTING1, // issued connection request
CLIENT_CONNECTING2, // connection established, but waiting for response message to get sent
CLIENT_CONNECTED, // connected
CLIENT_DEAD
};
struct mux_client {
int fd;
unsigned char *ob_buf;
uint32_t ob_size;
uint32_t ob_capacity;
unsigned char *ib_buf;
uint32_t ib_size;
uint32_t ib_capacity;
short events, devents;
uint32_t connect_tag;
int connect_device;
enum client_state state;
uint32_t proto_version;
};
static struct collection client_list;
int client_read(struct mux_client *client, void *buffer, uint32_t len)
{
usbmuxd_log(LL_SPEW, "client_read fd %d buf %p len %d", client->fd, buffer, len);
if(client->state != CLIENT_CONNECTED) {
usbmuxd_log(LL_ERROR, "Attempted to read from client %d not in CONNECTED state", client->fd);
return -1;
}
return recv(client->fd, buffer, len, 0);
}
int client_write(struct mux_client *client, void *buffer, uint32_t len)
{
usbmuxd_log(LL_SPEW, "client_write fd %d buf %p len %d", client->fd, buffer, len);
if(client->state != CLIENT_CONNECTED) {
usbmuxd_log(LL_ERROR, "Attempted to write to client %d not in CONNECTED state", client->fd);
return -1;
}
return send(client->fd, buffer, len, 0);
}
int client_set_events(struct mux_client *client, short events)
{
if((client->state != CLIENT_CONNECTED) && (client->state != CLIENT_CONNECTING2)) {
usbmuxd_log(LL_ERROR, "client_set_events to client %d not in CONNECTED state", client->fd);
return -1;
}
client->devents = events;
if(client->state == CLIENT_CONNECTED)
client->events = events;
return 0;
}
int client_accept(int listenfd)
{
struct sockaddr_un addr;
int cfd;
socklen_t len = sizeof(struct sockaddr_un);
cfd = accept(listenfd, (struct sockaddr *)&addr, &len);
if (cfd < 0) {
usbmuxd_log(LL_ERROR, "accept() failed (%s)", strerror(errno));
return cfd;
}
struct mux_client *client;
client = malloc(sizeof(struct mux_client));
memset(client, 0, sizeof(struct mux_client));
client->fd = cfd;
client->ob_buf = malloc(REPLY_BUF_SIZE);
client->ob_size = 0;
client->ob_capacity = REPLY_BUF_SIZE;
client->ib_buf = malloc(CMD_BUF_SIZE);
client->ib_size = 0;
client->ib_capacity = CMD_BUF_SIZE;
client->state = CLIENT_COMMAND;
client->events = POLLIN;
collection_add(&client_list, client);
usbmuxd_log(LL_INFO, "New client on fd %d", client->fd);
return client->fd;
}
void client_close(struct mux_client *client)
{
usbmuxd_log(LL_INFO, "Disconnecting client fd %d", client->fd);
if(client->state == CLIENT_CONNECTING1 || client->state == CLIENT_CONNECTING2) {
usbmuxd_log(LL_INFO, "Client died mid-connect, aborting device %d connection", client->connect_device);
client->state = CLIENT_DEAD;
device_abort_connect(client->connect_device, client);
}
close(client->fd);
if(client->ob_buf)
free(client->ob_buf);
if(client->ib_buf)
free(client->ib_buf);
collection_remove(&client_list, client);
free(client);
}
void client_get_fds(struct fdlist *list)
{
FOREACH(struct mux_client *client, &client_list) {
fdlist_add(list, FD_CLIENT, client->fd, client->events);
} ENDFOREACH
}
static int send_pkt(struct mux_client *client, uint32_t tag, enum usbmuxd_msgtype msg, void *payload, int payload_length)
{
struct usbmuxd_header hdr;
hdr.version = client->proto_version;
hdr.length = sizeof(hdr) + payload_length;
hdr.message = msg;
hdr.tag = tag;
usbmuxd_log(LL_DEBUG, "send_pkt fd %d tag %d msg %d payload_length %d", client->fd, tag, msg, payload_length);
if((client->ob_capacity - client->ob_size) < hdr.length) {
usbmuxd_log(LL_ERROR, "Client %d output buffer full (%d bytes) while sending message %d (%d bytes)", client->fd, client->ob_capacity, hdr.message, hdr.length);
client_close(client);
return -1;
}
memcpy(client->ob_buf + client->ob_size, &hdr, sizeof(hdr));
if(payload && payload_length)
memcpy(client->ob_buf + client->ob_size + sizeof(hdr), payload, payload_length);
client->ob_size += hdr.length;
client->events |= POLLOUT;
return hdr.length;
}
static int send_result(struct mux_client *client, uint32_t tag, uint32_t result)
{
int res = -1;
#ifdef HAVE_PLIST
if (client->proto_version == 1) {
/* XML plist packet */
char *xml = NULL;
uint32_t xmlsize = 0;
plist_t dict = plist_new_dict();
plist_dict_insert_item(dict, "MessageType", plist_new_string("Result"));
plist_dict_insert_item(dict, "Number", plist_new_uint(result));
plist_to_xml(dict, &xml, &xmlsize);
plist_free(dict);
if (xml) {
res = send_pkt(client, tag, MESSAGE_PLIST, xml, xmlsize);
free(xml);
} else {
usbmuxd_log(LL_ERROR, "%s: Could not convert plist to xml", __func__);
}
} else
#endif
{
/* binary packet */
res = send_pkt(client, tag, MESSAGE_RESULT, &result, sizeof(uint32_t));
}
return res;
}
int client_notify_connect(struct mux_client *client, enum usbmuxd_result result)
{
usbmuxd_log(LL_SPEW, "client_notify_connect fd %d result %d", client->fd, result);
if(client->state == CLIENT_DEAD)
return -1;
if(client->state != CLIENT_CONNECTING1) {
usbmuxd_log(LL_ERROR, "client_notify_connect when client %d is not in CONNECTING1 state", client->fd);
return -1;
}
if(send_result(client, client->connect_tag, result) < 0)
return -1;
if(result == RESULT_OK) {
client->state = CLIENT_CONNECTING2;
client->events = POLLOUT; // wait for the result packet to go through
// no longer need this
free(client->ib_buf);
client->ib_buf = NULL;
} else {
client->state = CLIENT_COMMAND;
}
return 0;
}
static int notify_device_add(struct mux_client *client, struct device_info *dev)
{
int res = -1;
#ifdef HAVE_PLIST
if (client->proto_version == 1) {
/* XML plist packet */
char *xml = NULL;
uint32_t xmlsize = 0;
plist_t dict = plist_new_dict();
plist_dict_insert_item(dict, "MessageType", plist_new_string("Attached"));
plist_t props = plist_new_dict();
// TODO: get current usb speed
plist_dict_insert_item(props, "ConnectionSpeed", plist_new_uint(480000000));
plist_dict_insert_item(props, "ConnectionType", plist_new_string("USB"));
plist_dict_insert_item(props, "DeviceID", plist_new_uint(dev->id));
plist_dict_insert_item(props, "LocationID", plist_new_uint(dev->location));
plist_dict_insert_item(props, "ProductID", plist_new_uint(dev->pid));
plist_dict_insert_item(props, "SerialNumber", plist_new_string(dev->serial));
plist_dict_insert_item(dict, "Properties", props);
plist_to_xml(dict, &xml, &xmlsize);
plist_free(dict);
if (xml) {
res = send_pkt(client, 0, MESSAGE_PLIST, xml, xmlsize);
free(xml);
} else {
usbmuxd_log(LL_ERROR, "%s: Could not convert plist to xml", __func__);
}
} else
#endif
{
/* binary packet */
struct usbmuxd_device_record dmsg;
memset(&dmsg, 0, sizeof(dmsg));
dmsg.device_id = dev->id;
strncpy(dmsg.serial_number, dev->serial, 256);
dmsg.serial_number[255] = 0;
dmsg.location = dev->location;
dmsg.product_id = dev->pid;
res = send_pkt(client, 0, MESSAGE_DEVICE_ADD, &dmsg, sizeof(dmsg));
}
return res;
}
static int notify_device_remove(struct mux_client *client, uint32_t device_id)
{
int res = -1;
#ifdef HAVE_PLIST
if (client->proto_version == 1) {
/* XML plist packet */
char *xml = NULL;
uint32_t xmlsize = 0;
plist_t dict = plist_new_dict();
plist_dict_insert_item(dict, "MessageType", plist_new_string("Detached"));
plist_dict_insert_item(dict, "DeviceID", plist_new_uint(device_id));
plist_to_xml(dict, &xml, &xmlsize);
plist_free(dict);
if (xml) {
res = send_pkt(client, 0, MESSAGE_PLIST, xml, xmlsize);
free(xml);
} else {
usbmuxd_log(LL_ERROR, "%s: Could not convert plist to xml", __func__);
}
} else
#endif
{
/* binary packet */
res = send_pkt(client, 0, MESSAGE_DEVICE_REMOVE, &device_id, sizeof(uint32_t));
}
return res;
}
static int start_listen(struct mux_client *client)
{
struct device_info *devs;
struct device_info *dev;
int count, i;
client->state = CLIENT_LISTEN;
count = device_get_count();
if(!count)
return 0;
devs = malloc(sizeof(struct device_info) * count);
count = device_get_list(devs);
// going to need a larger buffer for many devices
int needed_buffer = count * (sizeof(struct usbmuxd_device_record) + sizeof(struct usbmuxd_header)) + REPLY_BUF_SIZE;
if(client->ob_capacity < needed_buffer) {
usbmuxd_log(LL_DEBUG, "Enlarging client %d reply buffer %d -> %d to make space for device notifications", client->fd, client->ob_capacity, needed_buffer);
client->ob_buf = realloc(client->ob_buf, needed_buffer);
client->ob_capacity = needed_buffer;
}
dev = devs;
for(i=0; i<count; i++) {
if(notify_device_add(client, dev++) < 0) {
free(devs);
return -1;
}
}
free(devs);
return count;
}
static int client_command(struct mux_client *client, struct usbmuxd_header *hdr)
{
int res;
usbmuxd_log(LL_DEBUG, "Client command in fd %d len %d ver %d msg %d tag %d", client->fd, hdr->length, hdr->version, hdr->message, hdr->tag);
if(client->state != CLIENT_COMMAND) {
usbmuxd_log(LL_ERROR, "Client %d command received in the wrong state", client->fd);
if(send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
return -1;
client_close(client);
return -1;
}
struct usbmuxd_connect_request *ch;
#ifdef HAVE_PLIST
char *payload;
uint32_t payload_size;
#endif
switch(hdr->message) {
#ifdef HAVE_PLIST
case MESSAGE_PLIST:
client->proto_version = 1;
payload = (char*)(hdr) + sizeof(struct usbmuxd_header);
payload_size = hdr->length - sizeof(struct usbmuxd_header);
plist_t dict = NULL;
plist_from_xml(payload, payload_size, &dict);
if (!dict) {
usbmuxd_log(LL_ERROR, "Could not parse plist from payload!");
return -1;
} else {
char *message = NULL;
plist_t node = plist_dict_get_item(dict, "MessageType");
plist_get_string_val(node, &message);
if (!message) {
usbmuxd_log(LL_ERROR, "Could not extract MessageType from plist!");
plist_free(dict);
return -1;
}
if (!strcmp(message, "Listen")) {
free(message);
plist_free(dict);
if (send_result(client, hdr->tag, 0) < 0)
return -1;
usbmuxd_log(LL_DEBUG, "Client %d now LISTENING", client->fd);
return start_listen(client);
} else if (!strcmp(message, "Connect")) {
uint64_t val;
uint16_t portnum = 0;
uint32_t device_id = 0;
free(message);
// get device id
node = plist_dict_get_item(dict, "DeviceID");
if (!node) {
usbmuxd_log(LL_ERROR, "Received connect request without device_id!");
plist_free(dict);
if (send_result(client, hdr->tag, RESULT_BADDEV) < 0)
return -1;
return 0;
}
val = 0;
plist_get_uint_val(node, &val);
device_id = (uint32_t)val;
// get port number
node = plist_dict_get_item(dict, "PortNumber");
if (!node) {
usbmuxd_log(LL_ERROR, "Received connect request without port number!");
plist_free(dict);
if (send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
return -1;
return 0;
}
val = 0;
plist_get_uint_val(node, &val);
portnum = (uint16_t)val;
usbmuxd_log(LL_DEBUG, "Client %d connection request to device %d port %d", client->fd, device_id, ntohs(portnum));
res = device_start_connect(device_id, ntohs(portnum), client);
if(res < 0) {
if (send_result(client, hdr->tag, -res) < 0)
return -1;
} else {
client->connect_tag = hdr->tag;
client->connect_device = device_id;
client->state = CLIENT_CONNECTING1;
}
return 0;
} else {
usbmuxd_log(LL_ERROR, "Unexpected command '%s' received!", message);
free(message);
plist_free(dict);
if (send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
return -1;
return 0;
}
}
// should not be reached?!
return -1;
#endif
case MESSAGE_LISTEN:
if(send_result(client, hdr->tag, 0) < 0)
return -1;
usbmuxd_log(LL_DEBUG, "Client %d now LISTENING", client->fd);
return start_listen(client);
case MESSAGE_CONNECT:
ch = (void*)hdr;
usbmuxd_log(LL_DEBUG, "Client %d connection request to device %d port %d", client->fd, ch->device_id, ntohs(ch->port));
res = device_start_connect(ch->device_id, ntohs(ch->port), client);
if(res < 0) {
if(send_result(client, hdr->tag, -res) < 0)
return -1;
} else {
client->connect_tag = hdr->tag;
client->connect_device = ch->device_id;
client->state = CLIENT_CONNECTING1;
}
return 0;
default:
usbmuxd_log(LL_ERROR, "Client %d invalid command %d", client->fd, hdr->message);
if(send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
return -1;
return 0;
}
return -1;
}
static void process_send(struct mux_client *client)
{
int res;
if(!client->ob_size) {
usbmuxd_log(LL_WARNING, "Client %d OUT process but nothing to send?", client->fd);
client->events &= ~POLLOUT;
return;
}
res = send(client->fd, client->ob_buf, client->ob_size, 0);
if(res <= 0) {
usbmuxd_log(LL_ERROR, "Send to client fd %d failed: %d %s", client->fd, res, strerror(errno));
client_close(client);
return;
}
if(res == client->ob_size) {
client->ob_size = 0;
client->events &= ~POLLOUT;
if(client->state == CLIENT_CONNECTING2) {
usbmuxd_log(LL_DEBUG, "Client %d switching to CONNECTED state", client->fd);
client->state = CLIENT_CONNECTED;
client->events = client->devents;
// no longer need this
free(client->ob_buf);
client->ob_buf = NULL;
}
} else {
client->ob_size -= res;
memmove(client->ob_buf, client->ob_buf + res, client->ob_size);
}
}
static void process_recv(struct mux_client *client)
{
int res;
int did_read = 0;
if(client->ib_size < sizeof(struct usbmuxd_header)) {
res = recv(client->fd, client->ib_buf + client->ib_size, sizeof(struct usbmuxd_header) - client->ib_size, 0);
if(res <= 0) {
if(res < 0)
usbmuxd_log(LL_ERROR, "Receive from client fd %d failed: %s", client->fd, strerror(errno));
else
usbmuxd_log(LL_INFO, "Client %d connection closed", client->fd);
client_close(client);
return;
}
client->ib_size += res;
if(client->ib_size < sizeof(struct usbmuxd_header))
return;
did_read = 1;
}
struct usbmuxd_header *hdr = (void*)client->ib_buf;
#ifdef HAVE_PLIST
if((hdr->version != 0) && (hdr->version != 1)) {
usbmuxd_log(LL_INFO, "Client %d version mismatch: expected 0 or 1, got %d", client->fd, hdr->version);
#else
if(hdr->version != USBMUXD_PROTOCOL_VERSION) {
usbmuxd_log(LL_INFO, "Client %d version mismatch: expected %d, got %d", client->fd, USBMUXD_PROTOCOL_VERSION, hdr->version);
#endif
client_close(client);
return;
}
if(hdr->length > client->ib_capacity) {
usbmuxd_log(LL_INFO, "Client %d message is too long (%d bytes)", client->fd, hdr->length);
client_close(client);
return;
}
if(hdr->length < sizeof(struct usbmuxd_header)) {
usbmuxd_log(LL_ERROR, "Client %d message is too short (%d bytes)", client->fd, hdr->length);
client_close(client);
return;
}
if(client->ib_size < hdr->length) {
if(did_read)
return; //maybe we would block, so defer to next loop
res = recv(client->fd, client->ib_buf + client->ib_size, hdr->length - client->ib_size, 0);
if(res < 0) {
usbmuxd_log(LL_ERROR, "Receive from client fd %d failed: %s", client->fd, strerror(errno));
client_close(client);
return;
} else if(res == 0) {
usbmuxd_log(LL_INFO, "Client %d connection closed", client->fd);
client_close(client);
return;
}
client->ib_size += res;
if(client->ib_size < hdr->length)
return;
}
client_command(client, hdr);
client->ib_size = 0;
}
void client_process(int fd, short events)
{
struct mux_client *client = NULL;
FOREACH(struct mux_client *lc, &client_list) {
if(lc->fd == fd) {
client = lc;
break;
}
} ENDFOREACH
if(!client) {
usbmuxd_log(LL_INFO, "client_process: fd %d not found in client list", fd);
return;
}
if(client->state == CLIENT_CONNECTED) {
usbmuxd_log(LL_SPEW, "client_process in CONNECTED state");
device_client_process(client->connect_device, client, events);
} else {
if(events & POLLIN) {
process_recv(client);
} else if(events & POLLOUT) { //not both in case client died as part of process_recv
process_send(client);
}
}
}
void client_device_add(struct device_info *dev)
{
usbmuxd_log(LL_DEBUG, "client_device_add: id %d, location 0x%x, serial %s", dev->id, dev->location, dev->serial);
FOREACH(struct mux_client *client, &client_list) {
if(client->state == CLIENT_LISTEN)
notify_device_add(client, dev);
} ENDFOREACH
}
void client_device_remove(int device_id)
{
uint32_t id = device_id;
usbmuxd_log(LL_DEBUG, "client_device_remove: id %d", device_id);
FOREACH(struct mux_client *client, &client_list) {
if(client->state == CLIENT_LISTEN)
notify_device_remove(client, id);
} ENDFOREACH
}
void client_init(void)
{
usbmuxd_log(LL_DEBUG, "client_init");
collection_init(&client_list);
}
void client_shutdown(void)
{
usbmuxd_log(LL_DEBUG, "client_shutdown");
FOREACH(struct mux_client *client, &client_list) {
client_close(client);
} ENDFOREACH
collection_free(&client_list);
}
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