diff options
Diffstat (limited to 'backends/maweb.c')
| -rw-r--r-- | backends/maweb.c | 1072 |
1 files changed, 1072 insertions, 0 deletions
diff --git a/backends/maweb.c b/backends/maweb.c new file mode 100644 index 0000000..d008cc0 --- /dev/null +++ b/backends/maweb.c @@ -0,0 +1,1072 @@ +#include <string.h> +#include <unistd.h> +#include <errno.h> +#ifndef MAWEB_NO_LIBSSL +#include <openssl/md5.h> +#endif + +#include "libmmbackend.h" +#include "maweb.h" + +#define BACKEND_NAME "maweb" +#define WS_LEN(a) ((a) & 0x7F) +#define WS_OP(a) ((a) & 0x0F) +#define WS_FLAG_FIN 0x80 +#define WS_FLAG_MASK 0x80 + +static uint64_t last_keepalive = 0; +static uint64_t update_interval = 50; +static uint64_t last_update = 0; +static uint64_t updates_inflight = 0; + +static maweb_command_key cmdline_keys[] = { + {"PREV", 109, 0, 1}, {"SET", 108, 1, 0, 1}, {"NEXT", 110, 0, 1}, + {"TIME", 58, 1, 1}, {"EDIT", 55, 1, 1}, {"UPDATE", 57, 1, 1}, + {"OOPS", 53, 1, 1}, {"ESC", 54, 1, 1}, {"CLEAR", 105, 1, 1}, + {"0", 86, 1, 1}, {"1", 87, 1, 1}, {"2", 88, 1, 1}, + {"3", 89, 1, 1}, {"4", 90, 1, 1}, {"5", 91, 1, 1}, + {"6", 92, 1, 1}, {"7", 93, 1, 1}, {"8", 94, 1, 1}, + {"9", 95, 1, 1}, {"PUNKT", 98, 1, 1}, {"ENTER", 106, 1, 1}, + {"PLUS", 96, 1, 1}, {"MINUS", 97, 1, 1}, {"THRU", 102, 1, 1}, + {"IF", 103, 1, 1}, {"AT", 104, 1, 1}, {"FULL", 99, 1, 1}, + {"MA", 68, 0, 1}, {"HIGH", 100, 1, 1, 1}, {"SOLO", 101, 1, 1, 1}, + {"SELECT", 42, 1, 1}, {"OFF", 43, 1, 1}, {"ON", 46, 1, 1}, + {"ASSIGN", 63, 1, 1}, {"LABEL", 0, 1, 1}, + {"COPY", 73, 1, 1}, {"DELETE", 69, 1, 1}, {"STORE", 59, 1, 1}, + {"GOTO", 56, 1, 1}, {"PAGE", 70, 1, 1}, {"MACRO", 71, 1, 1}, + {"PRESET", 72, 1, 1}, {"SEQU", 74, 1, 1}, {"CUE", 75, 1, 1}, + {"EXEC", 76, 1, 1}, {"FIXTURE", 83, 1, 1}, {"GROUP", 84, 1, 1}, + {"GO_MINUS", 10, 1, 1}, {"PAUSE", 9, 1, 1}, {"GO_PLUS", 11, 1, 1}, + + {"FIXTURE_CHANNEL", 0, 1, 1}, {"FIXTURE_GROUP_PRESET", 0, 1, 1}, + {"EXEC_CUE", 0, 1, 1}, {"STORE_UPDATE", 0, 1, 1}, {"PROG_ONLY", 0, 1, 1, 1}, + {"SPECIAL_DIALOGUE", 0, 1, 1}, + {"ODD", 0, 1, 1}, {"EVEN", 0, 1, 1}, + {"WINGS", 0, 1, 1}, {"RESET", 0, 1, 1}, + //gma2 internal only + {"CHPGPLUS", 3}, {"CHPGMINUS", 4}, + {"FDPGPLUS", 5}, {"FDPGMINUS", 6}, + {"BTPGPLUS", 7}, {"BTPGMINUS", 8}, + {"X1", 12}, {"X2", 13}, {"X3", 14}, + {"X4", 15}, {"X5", 16}, {"X6", 17}, + {"X7", 18}, {"X8", 19}, {"X9", 20}, + {"X10", 21}, {"X11", 22}, {"X12", 23}, + {"X13", 24}, {"X14", 25}, {"X15", 26}, + {"X16", 27}, {"X17", 28}, {"X18", 29}, + {"X19", 30}, {"X20", 31}, + {"V1", 120}, {"V2", 121}, {"V3", 122}, + {"V4", 123}, {"V5", 124}, {"V6", 125}, + {"V7", 126}, {"V8", 127}, {"V9", 128}, + {"V10", 129}, + {"NIPPLE", 40}, + {"TOOLS", 119}, {"SETUP", 117}, {"BACKUP", 117}, + {"BLIND", 60}, {"FREEZE", 61}, {"PREVIEW", 62}, + {"FIX", 41}, {"TEMP", 44}, {"TOP", 45}, + {"VIEW", 66}, {"EFFECT", 67}, {"CHANNEL", 82}, + {"MOVE", 85}, {"BLACKOUT", 65}, + {"PLEASE", 106}, + {"LIST", 32}, {"USER1", 33}, {"USER2", 34}, + {"ALIGN", 64}, {"HELP", 116}, + {"UP", 107}, {"DOWN", 111}, + {"FASTREVERSE", 47}, {"LEARN", 48}, {"FASTFORWARD", 49}, + {"GO_MINUS_SMALL", 50}, {"PAUSE_SMALL", 51}, {"GO_PLUS_SMALL", 52} +}; + +MM_PLUGIN_API int init(){ + backend maweb = { + .name = BACKEND_NAME, + .conf = maweb_configure, + .create = maweb_instance, + .conf_instance = maweb_configure_instance, + .channel = maweb_channel, + .handle = maweb_set, + .process = maweb_handle, + .start = maweb_start, + .shutdown = maweb_shutdown, + .interval = maweb_interval + }; + + //register backend + if(mm_backend_register(maweb)){ + fprintf(stderr, "Failed to register maweb backend\n"); + return 1; + } + return 0; +} + +static ssize_t maweb_channel_index(maweb_instance_data* data, maweb_channel_type type, uint16_t page, uint16_t index){ + size_t n; + for(n = 0; n < data->channels; n++){ + if(data->channel[n].type == type + && data->channel[n].page == page + && data->channel[n].index == index){ + return n; + } + } + return -1; +} + +static int channel_comparator(const void* raw_a, const void* raw_b){ + maweb_channel_data* a = (maweb_channel_data*) raw_a; + maweb_channel_data* b = (maweb_channel_data*) raw_b; + + //this needs to take into account command line channels + //they need to be sorted last so that the channel poll logic works properly + if(a->page != b->page){ + return a->page - b->page; + } + //execs and their components are sorted by index first, type second + if(a->type < cmdline && b->type < cmdline){ + if(a->index != b->index){ + return a->index - b->index; + } + return a->type - b->type; + } + //if either one is not an exec, sort by type first, index second + if(a->type != b->type){ + return a->type - b->type; + } + return a->index - b->index; +} + +static uint32_t maweb_interval(){ + return update_interval - (last_update % update_interval); +} + +static int maweb_configure(char* option, char* value){ + if(!strcmp(option, "interval")){ + update_interval = strtoul(value, NULL, 10); + return 0; + } + + fprintf(stderr, "Unknown maweb backend configuration option %s\n", option); + return 1; +} + +static int maweb_configure_instance(instance* inst, char* option, char* value){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + char* host = NULL, *port = NULL; + + if(!strcmp(option, "host")){ + mmbackend_parse_hostspec(value, &host, &port); + if(!host){ + fprintf(stderr, "Invalid host specified for maweb instance %s\n", inst->name); + return 1; + } + free(data->host); + data->host = strdup(host); + free(data->port); + data->port = NULL; + if(port){ + data->port = strdup(port); + } + return 0; + } + else if(!strcmp(option, "user")){ + free(data->user); + data->user = strdup(value); + return 0; + } + else if(!strcmp(option, "password")){ + #ifndef MAWEB_NO_LIBSSL + size_t n; + uint8_t password_hash[MD5_DIGEST_LENGTH]; + + MD5((uint8_t*) value, strlen(value), (uint8_t*) password_hash); + data->pass = realloc(data->pass, (2 * MD5_DIGEST_LENGTH + 1) * sizeof(char)); + for(n = 0; n < MD5_DIGEST_LENGTH; n++){ + snprintf(data->pass + 2 * n, 3, "%02x", password_hash[n]); + } + return 0; + #else + fprintf(stderr, "This build of the maweb backend only supports the default password\n"); + return 1; + #endif + } + else if(!strcmp(option, "cmdline")){ + if(!strcmp(value, "console")){ + data->cmdline = cmd_console; + } + else if(!strcmp(value, "remote")){ + data->cmdline = cmd_remote; + } + else if(!strcmp(value, "downgrade")){ + data->cmdline = cmd_downgrade; + } + else{ + fprintf(stderr, "Unknown maweb commandline mode %s for instance %s\n", value, inst->name); + return 1; + } + return 0; + } + + fprintf(stderr, "Unknown configuration parameter %s for maweb instance %s\n", option, inst->name); + return 1; +} + +static instance* maweb_instance(){ + instance* inst = mm_instance(); + if(!inst){ + return NULL; + } + + maweb_instance_data* data = calloc(1, sizeof(maweb_instance_data)); + if(!data){ + fprintf(stderr, "Failed to allocate memory\n"); + return NULL; + } + + data->fd = -1; + data->buffer = calloc(MAWEB_RECV_CHUNK, sizeof(uint8_t)); + if(!data->buffer){ + fprintf(stderr, "Failed to allocate memory\n"); + free(data); + return NULL; + } + data->allocated = MAWEB_RECV_CHUNK; + + inst->impl = data; + return inst; +} + +static channel* maweb_channel(instance* inst, char* spec, uint8_t flags){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + maweb_channel_data chan = { + 0 + }; + char* next_token = NULL; + channel* channel_ref = NULL; + size_t n; + + if(!strncmp(spec, "page", 4)){ + chan.page = strtoul(spec + 4, &next_token, 10); + if(*next_token != '.'){ + fprintf(stderr, "Failed to parse maweb channel spec %s: Missing separator\n", spec); + return NULL; + } + + next_token++; + if(!strncmp(next_token, "fader", 5)){ + chan.type = exec_fader; + next_token += 5; + } + else if(!strncmp(next_token, "upper", 5)){ + chan.type = exec_upper; + next_token += 5; + } + else if(!strncmp(next_token, "lower", 5)){ + chan.type = exec_lower; + next_token += 5; + } + else if(!strncmp(next_token, "flash", 5)){ + chan.type = exec_button; + next_token += 5; + } + else if(!strncmp(next_token, "button", 6)){ + chan.type = exec_button; + next_token += 6; + } + chan.index = strtoul(next_token, NULL, 10); + } + else{ + for(n = 0; n < sizeof(cmdline_keys) / sizeof(maweb_command_key); n++){ + if(!strcmp(spec, cmdline_keys[n].name)){ + if((data->cmdline == cmd_remote && !cmdline_keys[n].press && !cmdline_keys[n].release) + || (data->cmdline == cmd_console && !cmdline_keys[n].lua)){ + fprintf(stderr, "maweb cmdline key %s does not work with the current commandline mode for instance %s\n", spec, inst->name); + return NULL; + } + + chan.type = cmdline; + chan.index = n + 1; + chan.page = 1; + break; + } + } + } + + if(chan.type && chan.index && chan.page){ + //actually, those are zero-indexed... + chan.index--; + chan.page--; + + if(maweb_channel_index(data, chan.type, chan.page, chan.index) == -1){ + data->channel = realloc(data->channel, (data->channels + 1) * sizeof(maweb_channel_data)); + if(!data->channel){ + fprintf(stderr, "Failed to allocate memory\n"); + return NULL; + } + data->channel[data->channels] = chan; + data->channels++; + } + + channel_ref = mm_channel(inst, maweb_channel_index(data, chan.type, chan.page, chan.index), 1); + data->channel[maweb_channel_index(data, chan.type, chan.page, chan.index)].chan = channel_ref; + return channel_ref; + } + + fprintf(stderr, "Failed to parse maweb channel spec %s\n", spec); + return NULL; +} + +static int maweb_send_frame(instance* inst, maweb_operation op, uint8_t* payload, size_t len){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + uint8_t frame_header[MAWEB_FRAME_HEADER_LENGTH] = ""; + size_t header_bytes = 2; + uint16_t* payload_len16 = (uint16_t*) (frame_header + 2); + uint64_t* payload_len64 = (uint64_t*) (frame_header + 2); + + frame_header[0] = WS_FLAG_FIN | op; + if(len <= 125){ + frame_header[1] = WS_FLAG_MASK | len; + } + else if(len <= 0xFFFF){ + frame_header[1] = WS_FLAG_MASK | 126; + *payload_len16 = htobe16(len); + header_bytes += 2; + } + else{ + frame_header[1] = WS_FLAG_MASK | 127; + *payload_len64 = htobe64(len); + header_bytes += 8; + } + //send a zero masking key because masking is stupid + header_bytes += 4; + + if(mmbackend_send(data->fd, frame_header, header_bytes) + || mmbackend_send(data->fd, payload, len)){ + return 1; + } + + return 0; +} + +static int maweb_process_playback(instance* inst, int64_t page, maweb_channel_type metatype, char* payload, size_t payload_length){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + size_t exec_blocks = json_obj_offset(payload, (metatype == 2) ? "executorBlocks" : "bottomButtons"), offset, block = 0, control; + int64_t exec_index = json_obj_int(payload, "iExec", 191); + ssize_t channel_index; + channel_value evt; + + if(!exec_blocks){ + if(metatype == 3){ + //ignore unused buttons + return 0; + } + fprintf(stderr, "maweb missing exec block data on exec %" PRIu64 ".%" PRIu64 "\n", page, exec_index); + return 1; + } + + //the bottomButtons key has an additional subentry + if(metatype == 3){ + exec_blocks += json_obj_offset(payload + exec_blocks, "items"); + } + + //iterate over executor blocks + for(offset = json_array_offset(payload + exec_blocks, block); offset; offset = json_array_offset(payload + exec_blocks, block)){ + control = exec_blocks + offset + json_obj_offset(payload + exec_blocks + offset, "fader"); + + channel_index = maweb_channel_index(data, exec_fader, page - 1, exec_index); + if(channel_index >= 0){ + if(!data->channel[channel_index].input_blocked){ + evt.normalised = json_obj_double(payload + control, "v", 0.0); + if(evt.normalised != data->channel[channel_index].in){ + mm_channel_event(mm_channel(inst, channel_index, 0), evt); + data->channel[channel_index].in = evt.normalised; + } + } + else{ + //block input immediately after channel set to prevent feedback loops + data->channel[channel_index].input_blocked--; + } + } + + channel_index = maweb_channel_index(data, exec_button, page - 1, exec_index); + if(channel_index >= 0){ + if(!data->channel[channel_index].input_blocked){ + evt.normalised = json_obj_int(payload, "isRun", 0); + if(evt.normalised != data->channel[channel_index].in){ + mm_channel_event(mm_channel(inst, channel_index, 0), evt); + data->channel[channel_index].in = evt.normalised; + } + } + else{ + data->channel[channel_index].input_blocked--; + } + } + + DBGPF("maweb page %" PRIu64 " exec %" PRIu64 " value %f running %" PRIu64 "\n", page, exec_index, json_obj_double(payload + control, "v", 0.0), json_obj_int(payload, "isRun", 0)); + exec_index++; + block++; + } + + return 0; +} + +static int maweb_process_playbacks(instance* inst, int64_t page, char* payload, size_t payload_length){ + size_t base_offset = json_obj_offset(payload, "itemGroups"), group_offset, subgroup_offset, item_offset; + uint64_t group = 0, subgroup, item, metatype; + + if(!page){ + fprintf(stderr, "maweb received playbacks for invalid page\n"); + return 0; + } + + if(!base_offset){ + fprintf(stderr, "maweb playback data missing item key\n"); + return 0; + } + + //iterate .itemGroups + for(group_offset = json_array_offset(payload + base_offset, group); + group_offset; + group_offset = json_array_offset(payload + base_offset, group)){ + metatype = json_obj_int(payload + base_offset + group_offset, "itemsType", 0); + //iterate .itemGroups.items + //FIXME this is problematic if there is no "items" key + group_offset = group_offset + json_obj_offset(payload + base_offset + group_offset, "items"); + if(group_offset){ + subgroup = 0; + group_offset += base_offset; + for(subgroup_offset = json_array_offset(payload + group_offset, subgroup); + subgroup_offset; + subgroup_offset = json_array_offset(payload + group_offset, subgroup)){ + //iterate .itemGroups.items[n] + item = 0; + subgroup_offset += group_offset; + for(item_offset = json_array_offset(payload + subgroup_offset, item); + item_offset; + item_offset = json_array_offset(payload + subgroup_offset, item)){ + maweb_process_playback(inst, page, metatype, + payload + subgroup_offset + item_offset, + payload_length - subgroup_offset - item_offset); + item++; + } + subgroup++; + } + } + group++; + } + updates_inflight--; + DBGPF("maweb playback message processing done, %" PRIu64 " updates inflight\n", updates_inflight); + return 0; +} + +static int maweb_request_playbacks(instance* inst){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + char xmit_buffer[MAWEB_XMIT_CHUNK]; + int rv = 0; + + char item_indices[1024] = "[300,400,500]", item_counts[1024] = "[16,16,16]", item_types[1024] = "[3,3,3]"; + size_t page_index = 0, view = 3, channel = 0, offsets[3], channel_offset, channels; + + if(updates_inflight){ + fprintf(stderr, "maweb skipping update request, %" PRIu64 " updates still inflight\n", updates_inflight); + return 0; + } + + //only request faders and buttons + for(channel = 0; channel < data->channels && data->channel[channel].type < cmdline; channel++){ + offsets[0] = offsets[1] = offsets[2] = 1; + page_index = data->channel[channel].page; + //poll logic differs between the consoles because reasons + //don't quote me on this section + if(data->peer_type == peer_dot2){ + //blocks 0, 100 & 200 have 21 execs and need to be queried from fader view + view = (data->channel[channel].index >= 300) ? 3 : 2; + + for(channel_offset = 1; channel + channel_offset <= data->channels + && data->channel[channel + channel_offset].type < cmdline; channel_offset++){ + channels = channel + channel_offset - 1; + //find end for this exec block + for(; channel + channel_offset < data->channels; channel_offset++){ + if(data->channel[channel + channel_offset].page != page_index + || (data->channel[channels].index / 100) != (data->channel[channel + channel_offset].index / 100)){ + break; + } + } + + //add request block for the exec block + offsets[0] += snprintf(item_indices + offsets[0], sizeof(item_indices) - offsets[0], "%d,", data->channel[channels].index); + offsets[1] += snprintf(item_counts + offsets[1], sizeof(item_counts) - offsets[1], "%d,", data->channel[channel + channel_offset - 1].index - data->channel[channels].index + 1); + offsets[2] += snprintf(item_types + offsets[2], sizeof(item_types) - offsets[2], "%d,", (data->channel[channels].index < 100) ? 2 : 3); + + //send on last channel, page boundary, metamode boundary + if(channel + channel_offset >= data->channels + || data->channel[channel + channel_offset].page != page_index + || (data->channel[channel].index < 300) != (data->channel[channel + channel_offset].index < 300)){ + break; + } + } + + //terminate arrays (overwriting the last array separator) + offsets[0] += snprintf(item_indices + offsets[0] - 1, sizeof(item_indices) - offsets[0], "]"); + offsets[1] += snprintf(item_counts + offsets[1] - 1, sizeof(item_counts) - offsets[1], "]"); + offsets[2] += snprintf(item_types + offsets[2] - 1, sizeof(item_types) - offsets[2], "]"); + } + else{ + //for the ma, the view equals the exec type requested (we can query all button execs from button view, all fader execs from fader view) + view = (data->channel[channel].index >= 100) ? 3 : 2; + snprintf(item_types, sizeof(item_types), "[%" PRIsize_t "]", view); + //this channel must be included, so it must be in range for the first startindex + snprintf(item_indices, sizeof(item_indices), "[%d]", (data->channel[channel].index / 5) * 5); + + //find end of exec block + for(channel_offset = 1; channel + channel_offset < data->channels + && data->channel[channel].page == data->channel[channel + channel_offset].page + && data->channel[channel].index / 100 == data->channel[channel + channel_offset].index / 100; channel_offset++){ + } + + //gma execs are grouped in blocks of 5 + channels = data->channel[channel + channel_offset - 1].index - (data->channel[channel].index / 5) * 5; + snprintf(item_counts, sizeof(item_indices), "[%" PRIsize_t "]", ((channels / 5) * 5 + 5)); + } + + DBGPF("maweb poll range first %d: %d.%d last %d: %d.%d next %d: %d.%d\n", + data->channel[channel].type, data->channel[channel].page, data->channel[channel].index, + data->channel[channel + channel_offset - 1].type, data->channel[channel + channel_offset - 1].page, data->channel[channel + channel_offset - 1].index, + data->channel[channel + channel_offset].type, data->channel[channel + channel_offset].page, data->channel[channel + channel_offset].index); + + //advance base channel + channel += channel_offset - 1; + + //send current request + snprintf(xmit_buffer, sizeof(xmit_buffer), + "{" + "\"requestType\":\"playbacks\"," + "\"startIndex\":%s," + "\"itemsCount\":%s," + "\"pageIndex\":%" PRIsize_t "," + "\"itemsType\":%s," + "\"view\":%" PRIsize_t "," + "\"execButtonViewMode\":2," //extended + "\"buttonsViewMode\":0," //get vfader for button execs + "\"session\":%" PRIu64 + "}", + item_indices, + item_counts, + page_index, + item_types, + view, + data->session); + rv |= maweb_send_frame(inst, ws_text, (uint8_t*) xmit_buffer, strlen(xmit_buffer)); + DBGPF("maweb poll request: %s\n", xmit_buffer); + updates_inflight++; + } + + DBGPF("maweb poll request handling done, %" PRIu64 " updates requested\n", updates_inflight); + return rv; +} + +static int maweb_handle_message(instance* inst, char* payload, size_t payload_length){ + char xmit_buffer[MAWEB_XMIT_CHUNK]; + char* field; + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + + //query this early to save on unnecessary parser passes with stupid-huge data messages + if(json_obj(payload, "responseType") == JSON_STRING){ + field = json_obj_str(payload, "responseType", NULL); + if(!strncmp(field, "login", 5)){ + if(json_obj_bool(payload, "result", 0)){ + fprintf(stderr, "maweb login successful\n"); + data->login = 1; + } + else{ + fprintf(stderr, "maweb login failed\n"); + data->login = 0; + } + } + if(!strncmp(field, "playbacks", 9)){ + if(maweb_process_playbacks(inst, json_obj_int(payload, "iPage", 0), payload, payload_length)){ + fprintf(stderr, "maweb failed to handle/request input data\n"); + } + return 0; + } + } + + DBGPF("maweb message (%" PRIsize_t "): %s\n", payload_length, payload); + if(json_obj(payload, "session") == JSON_NUMBER){ + data->session = json_obj_int(payload, "session", data->session); + if(data->session < 0){ + fprintf(stderr, "maweb login failed\n"); + data->login = 0; + return 0; + } + fprintf(stderr, "maweb session id is now %" PRId64 "\n", data->session); + } + + if(json_obj_bool(payload, "forceLogin", 0)){ + fprintf(stderr, "maweb sending user credentials\n"); + snprintf(xmit_buffer, sizeof(xmit_buffer), + "{\"requestType\":\"login\",\"username\":\"%s\",\"password\":\"%s\",\"session\":%" PRIu64 "}", + (data->peer_type == peer_dot2) ? "remote" : data->user, data->pass ? data->pass : MAWEB_DEFAULT_PASSWORD, data->session); + maweb_send_frame(inst, ws_text, (uint8_t*) xmit_buffer, strlen(xmit_buffer)); + } + if(json_obj(payload, "status") && json_obj(payload, "appType")){ + fprintf(stderr, "maweb connection established\n"); + field = json_obj_str(payload, "appType", NULL); + if(!strncmp(field, "dot2", 4)){ + data->peer_type = peer_dot2; + //the dot2 can't handle lua commands + data->cmdline = cmd_remote; + } + else if(!strncmp(field, "gma2", 4)){ + data->peer_type = peer_ma2; + } + maweb_send_frame(inst, ws_text, (uint8_t*) "{\"session\":0}", 13); + } + + return 0; +} + +static int maweb_connect(instance* inst){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + if(!data->host){ + return 1; + } + + //unregister old fd from core + if(data->fd >= 0){ + mm_manage_fd(data->fd, BACKEND_NAME, 0, NULL); + } + + data->fd = mmbackend_socket(data->host, data->port ? data->port : MAWEB_DEFAULT_PORT, SOCK_STREAM, 0, 0); + if(data->fd < 0){ + return 1; + } + + data->state = ws_new; + if(mmbackend_send_str(data->fd, "GET /?ma=1 HTTP/1.1\r\n") + || mmbackend_send_str(data->fd, "Connection: Upgrade\r\n") + || mmbackend_send_str(data->fd, "Upgrade: websocket\r\n") + || mmbackend_send_str(data->fd, "Sec-WebSocket-Version: 13\r\n") + //the websocket key probably should not be hardcoded, but this is not security critical + //and the whole websocket 'accept key' dance is plenty stupid as it is + || mmbackend_send_str(data->fd, "Sec-WebSocket-Key: rbEQrXMEvCm4ZUjkj6juBQ==\r\n") + || mmbackend_send_str(data->fd, "\r\n")){ + fprintf(stderr, "maweb backend failed to communicate with peer\n"); + return 1; + } + + //register new fd + if(mm_manage_fd(data->fd, BACKEND_NAME, 1, (void*) inst)){ + fprintf(stderr, "maweb backend failed to register fd\n"); + return 1; + } + return 0; +} + +static ssize_t maweb_handle_lines(instance* inst, ssize_t bytes_read){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + size_t n, begin = 0; + + for(n = 0; n < bytes_read - 1; n++){ + if(!strncmp((char*) data->buffer + data->offset + n, "\r\n", 2)){ + if(data->state == ws_new){ + if(!strncmp((char*) data->buffer, "HTTP/1.1 101", 12)){ + data->state = ws_http; + } + else{ + fprintf(stderr, "maweb received invalid HTTP response for instance %s\n", inst->name); + return -1; + } + } + else{ + //ignore all http stuff until the end of headers since we don't actually care... + if(n == begin){ + data->state = ws_open; + } + } + begin = n + 2; + } + } + + return data->offset + begin; +} + +static ssize_t maweb_handle_ws(instance* inst, ssize_t bytes_read){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + size_t header_length = 2; + uint64_t payload_length = 0; + uint16_t* payload_len16 = (uint16_t*) (data->buffer + 2); + uint64_t* payload_len64 = (uint64_t*) (data->buffer + 2); + uint8_t* payload = data->buffer + 2; + uint8_t terminator_temp = 0; + + if(data->offset + bytes_read < 2){ + return 0; + } + + //using varint as payload length is stupid, but some people seem to think otherwise... + payload_length = WS_LEN(data->buffer[1]); + switch(payload_length){ + case 126: + if(data->offset + bytes_read < 4){ + return 0; + } + payload_length = htobe16(*payload_len16); + payload = data->buffer + 4; + header_length = 4; + break; + case 127: + if(data->offset + bytes_read < 10){ + return 0; + } + payload_length = htobe64(*payload_len64); + payload = data->buffer + 10; + header_length = 10; + break; + default: + break; + } + + if(data->offset + bytes_read < header_length + payload_length){ + return 0; + } + + switch(WS_OP(data->buffer[0])){ + case ws_text: + //terminate message + terminator_temp = payload[payload_length]; + payload[payload_length] = 0; + if(maweb_handle_message(inst, (char*) payload, payload_length)){ + return data->offset + bytes_read; + } + payload[payload_length] = terminator_temp; + break; + case ws_ping: + //answer server ping with a pong + if(maweb_send_frame(inst, ws_pong, payload, payload_length)){ + fprintf(stderr, "maweb failed to send pong\n"); + } + return header_length + payload_length; + default: + fprintf(stderr, "maweb encountered unhandled frame type %02X\n", WS_OP(data->buffer[0])); + //this is somewhat dicey, it might be better to handle only header + payload length for known but unhandled types + return data->offset + bytes_read; + } + + return header_length + payload_length; +} + +static int maweb_handle_fd(instance* inst){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + ssize_t bytes_read, bytes_left = data->allocated - data->offset, bytes_handled; + + if(bytes_left < 3){ + data->buffer = realloc(data->buffer, (data->allocated + MAWEB_RECV_CHUNK) * sizeof(uint8_t)); + if(!data->buffer){ + fprintf(stderr, "Failed to allocate memory\n"); + return 1; + } + data->allocated += MAWEB_RECV_CHUNK; + bytes_left += MAWEB_RECV_CHUNK; + } + + bytes_read = recv(data->fd, data->buffer + data->offset, bytes_left - 1, 0); + if(bytes_read < 0){ + fprintf(stderr, "maweb backend failed to receive: %s\n", strerror(errno)); + //TODO close, reopen + return 1; + } + else if(bytes_read == 0){ + //client closed connection + //TODO try to reopen + return 0; + } + + do{ + switch(data->state){ + case ws_new: + case ws_http: + bytes_handled = maweb_handle_lines(inst, bytes_read); + break; + case ws_open: + bytes_handled = maweb_handle_ws(inst, bytes_read); + break; + case ws_closed: + bytes_handled = data->offset + bytes_read; + break; + } + + if(bytes_handled < 0){ + bytes_handled = data->offset + bytes_read; + data->offset = 0; + //TODO close, reopen + fprintf(stderr, "maweb failed to handle incoming data\n"); + return 1; + } + else if(bytes_handled == 0){ + break; + } + + memmove(data->buffer, data->buffer + bytes_handled, (data->offset + bytes_read) - bytes_handled); + + bytes_handled -= data->offset; + bytes_read -= bytes_handled; + data->offset = 0; + } while(bytes_read > 0); + + data->offset += bytes_read; + return 0; +} + +static int maweb_set(instance* inst, size_t num, channel** c, channel_value* v){ + maweb_instance_data* data = (maweb_instance_data*) inst->impl; + maweb_channel_data* chan = NULL; + char xmit_buffer[MAWEB_XMIT_CHUNK]; + size_t n; + + if(num && !data->login){ + fprintf(stderr, "maweb instance %s can not send output, not logged in\n", inst->name); + return 0; + } + + for(n = 0; n < num; n++){ + //sanity check + if(c[n]->ident >= data->channels){ + return 1; + } + chan = data->channel + c[n]->ident; + + //channel state tracking + if(chan->out == v[n].normalised){ + continue; + } + chan->out = v[n].normalised; + + //i/o value space separation & feedback filtering for faders + if(chan->type == exec_fader){ + chan->input_blocked = 1; + chan->in = v[n].normalised; + } + + switch(chan->type){ + case exec_fader: + snprintf(xmit_buffer, sizeof(xmit_buffer), + "{\"requestType\":\"playbacks_userInput\"," + "\"execIndex\":%d," + "\"pageIndex\":%d," + "\"faderValue\":%f," + "\"type\":1," + "\"session\":%" PRIu64 + "}", chan->index, chan->page, v[n].normalised, data->session); + break; + case exec_upper: + case exec_lower: + case exec_button: + snprintf(xmit_buffer, sizeof(xmit_buffer), + "{\"requestType\":\"playbacks_userInput\"," + //"\"cmdline\":\"\"," + "\"execIndex\":%d," + "\"pageIndex\":%d," + "\"buttonId\":%d," + "\"pressed\":%s," + "\"released\":%s," + "\"type\":0," + "\"session\":%" PRIu64 + "}", chan->index, chan->page, + (data->peer_type == peer_dot2 && chan->type == exec_upper) ? 0 : (chan->type - exec_button), + (v[n].normalised > 0.9) ? "true" : "false", + (v[n].normalised > 0.9) ? "false" : "true", + data->session); + break; + case cmdline: + if(cmdline_keys[chan->index].lua + && (data->cmdline == cmd_console || data->cmdline == cmd_downgrade) + && data->peer_type != peer_dot2){ + //push canbus events + snprintf(xmit_buffer, sizeof(xmit_buffer), + "{\"command\":\"LUA 'gma.canbus.hardkey(%d, %s, false)'\"," + "\"requestType\":\"command\"," + "\"session\":%" PRIu64 + "}", cmdline_keys[chan->index].lua, + (v[n].normalised > 0.9) ? "true" : "false", + data->session); + } + else if((cmdline_keys[chan->index].press || cmdline_keys[chan->index].release) + && (data->cmdline != cmd_console)){ + //send press/release events if required + if((cmdline_keys[chan->index].press && v[n].normalised > 0.9) + || (cmdline_keys[chan->index].release && v[n].normalised < 0.9)){ + snprintf(xmit_buffer, sizeof(xmit_buffer), + "{\"keyname\":\"%s\"," + "\"autoSubmit\":%s," + "\"value\":%d," + "\"session\":%" PRIu64 + "}", cmdline_keys[chan->index].name, + cmdline_keys[chan->index].auto_submit ? "true" : "null", + (v[n].normalised > 0.9) ? 1 : 0, + data->session); + } + else{ + continue; + } + } + else{ + fprintf(stderr, "maweb commandline key %s not executed on %s due to mode mismatch\n", + cmdline_keys[chan->index].name, inst->name); + continue; + } + break; + default: + fprintf(stderr, "maweb control not yet implemented\n"); + return 1; + } + DBGPF("maweb command out %s\n", xmit_buffer); + maweb_send_frame(inst, ws_text, (uint8_t*) xmit_buffer, strlen(xmit_buffer)); + } + return 0; +} + +static int maweb_keepalive(){ + size_t n, u; + instance** inst = NULL; + maweb_instance_data* data = NULL; + char xmit_buffer[MAWEB_XMIT_CHUNK]; + + //fetch all defined instances + if(mm_backend_instances(BACKEND_NAME, &n, &inst)){ + fprintf(stderr, "Failed to fetch instance list\n"); + return 1; + } + + //send keep-alive messages for logged-in instances + for(u = 0; u < n; u++){ + data = (maweb_instance_data*) inst[u]->impl; + if(data->login){ + snprintf(xmit_buffer, sizeof(xmit_buffer), "{\"session\":%" PRIu64 "}", data->session); + maweb_send_frame(inst[u], ws_text, (uint8_t*) xmit_buffer, strlen(xmit_buffer)); + } + } + + free(inst); + return 0; +} + +static int maweb_poll(){ + size_t n, u; + instance** inst = NULL; + maweb_instance_data* data = NULL; + + //fetch all defined instances + if(mm_backend_instances(BACKEND_NAME, &n, &inst)){ + fprintf(stderr, "Failed to fetch instance list\n"); + return 1; + } + + //send data polls for logged-in instances + for(u = 0; u < n; u++){ + data = (maweb_instance_data*) inst[u]->impl; + if(data->login){ + maweb_request_playbacks(inst[u]); + } + } + + free(inst); + return 0; +} + +static int maweb_handle(size_t num, managed_fd* fds){ + size_t n = 0; + int rv = 0; + + for(n = 0; n < num; n++){ + rv |= maweb_handle_fd((instance*) fds[n].impl); + } + + //FIXME all keepalive processing allocates temporary buffers, this might an optimization target + if(last_keepalive && mm_timestamp() - last_keepalive >= MAWEB_CONNECTION_KEEPALIVE){ + rv |= maweb_keepalive(); + last_keepalive = mm_timestamp(); + } + + if(last_update && mm_timestamp() - last_update >= update_interval){ + rv |= maweb_poll(); + last_update = mm_timestamp(); + } + + return rv; +} + +static int maweb_start(){ + size_t n, u, p; + instance** inst = NULL; + maweb_instance_data* data = NULL; + + //fetch all defined instances + if(mm_backend_instances(BACKEND_NAME, &n, &inst)){ + fprintf(stderr, "Failed to fetch instance list\n"); + return 1; + } + + for(u = 0; u < n; u++){ + //sort channels + data = (maweb_instance_data*) inst[u]->impl; + qsort(data->channel, data->channels, sizeof(maweb_channel_data), channel_comparator); + + //re-set channel identifiers + for(p = 0; p < data->channels; p++){ + data->channel[p].chan->ident = p; + } + + if(maweb_connect(inst[u])){ + fprintf(stderr, "Failed to open connection to MA Web Remote for instance %s\n", inst[u]->name); + free(inst); + return 1; + } + } + + free(inst); + if(!n){ + return 0; + } + + fprintf(stderr, "maweb backend registering %" PRIsize_t " descriptors to core\n", n); + + //initialize timeouts + last_keepalive = last_update = mm_timestamp(); + return 0; +} + +static int maweb_shutdown(){ + size_t n, u; + instance** inst = NULL; + maweb_instance_data* data = NULL; + + //fetch all instances + if(mm_backend_instances(BACKEND_NAME, &n, &inst)){ + fprintf(stderr, "Failed to fetch instance list\n"); + return 1; + } + + for(u = 0; u < n; u++){ + data = (maweb_instance_data*) inst[u]->impl; + free(data->host); + data->host = NULL; + free(data->port); + data->port = NULL; + free(data->user); + data->user = NULL; + free(data->pass); + data->pass = NULL; + + close(data->fd); + data->fd = -1; + + free(data->buffer); + data->buffer = NULL; + + data->offset = data->allocated = 0; + data->state = ws_new; + + free(data->channel); + data->channel = NULL; + data->channels = 0; + } + + free(inst); + + fprintf(stderr, "maweb backend shut down\n"); + return 0; +} |