diff options
Diffstat (limited to 'client.c')
| -rw-r--r-- | client.c | 402 |
1 files changed, 402 insertions, 0 deletions
@@ -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); +} |