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-rw-r--r--client.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/client.c b/client.c
index f0868fb..b33d892 100644
--- a/client.c
+++ b/client.c
@@ -22,7 +22,409 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include <config.h>
#endif
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <arpa/inet.h>
+
#include "log.h"
#include "usb.h"
#include "client.h"
+#include "device.h"
+
+#define CMD_BUF_SIZE 256
+#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;
+ int ob_size;
+ int ob_capacity;
+ unsigned char *ib_buf;
+ int ib_size;
+ int ib_capacity;
+ short events, devents;
+ uint32_t connect_tag;
+ int connect_device;
+ enum client_state state;
+};
+
+static struct collection client_list;
+
+int client_read(struct mux_client *client, void *buffer, int 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, int 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 client_msgtype msg, void *payload, int payload_length)
+{
+ struct client_header hdr;
+ hdr.version = CLIENT_PROTOCOL_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)
+{
+ return send_pkt(client, tag, MESSAGE_RESULT, &result, sizeof(uint32_t));
+}
+
+int client_notify_connect(struct mux_client *client, enum client_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(struct mux_client *client, struct device_info *dev)
+{
+ struct client_msg_dev dmsg;
+ memset(&dmsg, 0, sizeof(dmsg));
+ dmsg.device_id = dev->id;
+ strncpy(dmsg.device_serial, dev->serial, 256);
+ dmsg.device_serial[255] = 0;
+ dmsg.location = dev->location;
+ dmsg.device_pid = dev->pid;
+ return send_pkt(client, 0, MESSAGE_DEVICE_ADD, &dmsg, sizeof(dmsg));
+}
+
+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 client_msg_dev) + sizeof(struct client_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(client, dev++) < 0) {
+ free(devs);
+ return -1;
+ }
+ }
+ free(devs);
+ return count;
+}
+
+static int client_command(struct mux_client *client, struct client_header *hdr, const char *payload)
+{
+ 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 client_msg_connect *ch;
+ switch(hdr->message) {
+ 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*)payload;
+ 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 client_header)) {
+ res = recv(client->fd, client->ib_buf + client->ib_size, sizeof(struct client_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 client_header))
+ return;
+ did_read = 1;
+ }
+ struct client_header *hdr = (void*)client->ib_buf;
+ if(hdr->version != CLIENT_PROTOCOL_VERSION) {
+ usbmuxd_log(LL_INFO, "Client %d version mismatch: expected %d, got %d", client->fd, CLIENT_PROTOCOL_VERSION, hdr->version);
+ client_close(client);
+ }
+ 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);
+ }
+ if(hdr->length < sizeof(struct client_header)) {
+ usbmuxd_log(LL_ERROR, "Client %d message is too short (%d bytes)", client->fd, hdr->length);
+ client_close(client);
+ }
+ 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, (char *)(hdr+1));
+ 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_ERROR, "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(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)
+ send_pkt(client, 0, MESSAGE_DEVICE_REMOVE, &id, sizeof(uint32_t));
+ } 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);
+}