1 /* 2 * Copyright (C) 2009 by Matthias Ringwald 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 20 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 21 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 27 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 /* 33 * hci_h4_transport.c 34 * 35 * HCI Transport API implementation for basic H4 protocol 36 * 37 * Created by Matthias Ringwald on 4/29/09. 38 */ 39 #include <termios.h> /* POSIX terminal control definitions */ 40 #include <fcntl.h> /* File control definitions */ 41 #include <unistd.h> /* UNIX standard function definitions */ 42 #include <stdio.h> 43 #include <string.h> 44 45 #include "hci.h" 46 #include "hci_transport.h" 47 #include "hci_dump.h" 48 49 typedef enum { 50 H4_W4_PACKET_TYPE, 51 H4_W4_EVENT_HEADER, 52 H4_W4_EVENT_PAYLOAD, 53 H4_W4_ACL_HEADER, 54 H4_W4_ACL_PAYLOAD 55 } H4_STATE; 56 57 typedef struct hci_transport_h4 { 58 hci_transport_t transport; 59 data_source_t *ds; 60 } hci_transport_h4_t; 61 62 // single instance 63 static hci_transport_h4_t * hci_transport_h4 = NULL; 64 65 static int h4_process(struct data_source *ds); 66 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size); 67 static hci_uart_config_t *hci_uart_config; 68 69 static void (*packet_handler)(uint8_t packet_type, uint8_t *packet, uint16_t size) = dummy_handler; 70 71 // packet reader state machine 72 static H4_STATE h4_state; 73 static int bytes_to_read; 74 static int read_pos; 75 // static uint8_t hci_event_buffer[255+2]; // maximal payload + 2 bytes header 76 static uint8_t hci_packet[HCI_ACL_3DH5_SIZE]; // bigger than largest packet 77 78 #ifdef TEST_LONG_INVALID_REMOTE_NAME 79 // test event with remote name of 255 bytes length 80 const uint8_t remoteNameEvent[] = { 0x07, 0xFF, 0x00, 0xC4, 0xC6, 0x65, 0x5A, 0x12, 0x00, 0x4D, 0x69, 81 0x63, 0x72, 0x6F, 0x73, 0x6F, 0x66, 0x74, 0xAE, 0x20, 0x57, 0x69, 0x72, 0x65, 0x6C, 0x65, 82 0x73, 0x73, 0x20, 0x4E, 0x6F, 0x74, 0x65, 0x62, 0x6F, 0x6F, 0x6B, 0x20, 0x50, 0x72, 0x65, 83 0x73, 0x65, 0x6E, 0x74, 0x65, 0x72, 0x20, 0x4D, 0x6F, 0x75, 0x73, 0x65, 0x20, 0x38, 0x30, 84 0x30, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 85 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 86 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 87 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 88 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 89 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 90 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 91 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 92 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 93 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 94 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 95 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 96 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 97 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 98 const int remoteNameEventSize = sizeof(remoteNameEvent); 99 #endif 100 101 102 // prototypes 103 static int h4_open(void *transport_config){ 104 hci_uart_config = (hci_uart_config_t*) transport_config; 105 struct termios toptions; 106 int fd = open(hci_uart_config->device_name, O_RDWR | O_NOCTTY | O_NDELAY); 107 if (fd == -1) { 108 perror("init_serialport: Unable to open port "); 109 perror(hci_uart_config->device_name); 110 return -1; 111 } 112 113 if (tcgetattr(fd, &toptions) < 0) { 114 perror("init_serialport: Couldn't get term attributes"); 115 return -1; 116 } 117 speed_t brate = hci_uart_config->baudrate; // let you override switch below if needed 118 switch(hci_uart_config->baudrate) { 119 case 57600: brate=B57600; break; 120 case 115200: brate=B115200; break; 121 #ifdef B230400 122 case 230400: brate=B230400; break; 123 #endif 124 #ifdef B460800 125 case 460800: brate=B460800; break; 126 #endif 127 #ifdef B921600 128 case 921600: brate=B921600; break; 129 #endif 130 } 131 cfsetispeed(&toptions, brate); 132 cfsetospeed(&toptions, brate); 133 134 // 8N1 135 toptions.c_cflag &= ~PARENB; 136 toptions.c_cflag &= ~CSTOPB; 137 toptions.c_cflag &= ~CSIZE; 138 toptions.c_cflag |= CS8; 139 140 if (hci_uart_config->flowcontrol) { 141 // with flow control 142 toptions.c_cflag |= CRTSCTS; 143 } else { 144 // no flow control 145 toptions.c_cflag &= ~CRTSCTS; 146 } 147 148 toptions.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines 149 toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl 150 151 toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw 152 toptions.c_oflag &= ~OPOST; // make raw 153 154 // see: http://unixwiz.net/techtips/termios-vmin-vtime.html 155 toptions.c_cc[VMIN] = 1; 156 toptions.c_cc[VTIME] = 0; 157 158 if( tcsetattr(fd, TCSANOW, &toptions) < 0) { 159 perror("init_serialport: Couldn't set term attributes"); 160 return -1; 161 } 162 163 // set up data_source 164 hci_transport_h4->ds = malloc(sizeof(data_source_t)); 165 if (!hci_transport_h4) return -1; 166 hci_transport_h4->ds->fd = fd; 167 hci_transport_h4->ds->process = h4_process; 168 run_loop_add_data_source(hci_transport_h4->ds); 169 170 // init state machine 171 bytes_to_read = 1; 172 h4_state = H4_W4_PACKET_TYPE; 173 read_pos = 0; 174 175 return 0; 176 } 177 178 static int h4_close(){ 179 // first remove run loop handler 180 run_loop_remove_data_source(hci_transport_h4->ds); 181 182 // close device 183 close(hci_transport_h4->ds->fd); 184 free(hci_transport_h4->ds); 185 186 // free struct 187 hci_transport_h4->ds = NULL; 188 return 0; 189 } 190 191 static int h4_send_packet(uint8_t packet_type, uint8_t * packet, int size){ 192 if (hci_transport_h4->ds == NULL) return -1; 193 if (hci_transport_h4->ds->fd == 0) return -1; 194 hci_dump_packet( (uint8_t) packet_type, 0, packet, size); 195 write(hci_transport_h4->ds->fd, &packet_type, 1); 196 char *data = (char*) packet; 197 while (size > 0) { 198 int bytes_written = write(hci_transport_h4->ds->fd, data, size); 199 if (bytes_written < 0) { 200 return bytes_written; 201 } 202 data += bytes_written; 203 size -= bytes_written; 204 } 205 return 0; 206 } 207 208 static void h4_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){ 209 packet_handler = handler; 210 } 211 212 static int h4_process(struct data_source *ds) { 213 if (hci_transport_h4->ds->fd == 0) return -1; 214 215 // read up to bytes_to_read data in 216 int bytes_read = read(hci_transport_h4->ds->fd, &hci_packet[read_pos], bytes_to_read); 217 if (bytes_read < 0) { 218 return bytes_read; 219 } 220 bytes_to_read -= bytes_read; 221 read_pos += bytes_read; 222 if (bytes_to_read > 0) { 223 return 0; 224 } 225 226 // act 227 switch (h4_state) { 228 229 case H4_W4_PACKET_TYPE: 230 if (hci_packet[0] == HCI_EVENT_PACKET){ 231 read_pos = 0; 232 bytes_to_read = HCI_EVENT_PKT_HDR; 233 h4_state = H4_W4_EVENT_HEADER; 234 } else if (hci_packet[0] == HCI_ACL_DATA_PACKET){ 235 read_pos = 0; 236 bytes_to_read = HCI_ACL_DATA_PKT_HDR; 237 h4_state = H4_W4_ACL_HEADER; 238 } else { 239 fprintf(stderr, "h4_process: invalid packet type 0x%02x\n", hci_packet[0]); 240 read_pos = 0; 241 bytes_to_read = 1; 242 } 243 break; 244 245 case H4_W4_EVENT_HEADER: 246 bytes_to_read = hci_packet[1]; 247 h4_state = H4_W4_EVENT_PAYLOAD; 248 break; 249 250 case H4_W4_EVENT_PAYLOAD: 251 252 #ifdef TEST_LONG_INVALID_REMOTE_NAME 253 if (hci_packet[0] == HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE){ 254 hci_packet[1] = remoteNameEvent[1]; 255 memcpy( &hci_packet[9], &remoteNameEvent[9], remoteNameEventSize); 256 read_pos = remoteNameEventSize; 257 } 258 #endif 259 hci_dump_packet( HCI_EVENT_PACKET, 1, hci_packet, read_pos); 260 packet_handler(HCI_EVENT_PACKET, hci_packet, read_pos); 261 h4_state = H4_W4_PACKET_TYPE; 262 read_pos = 0; 263 bytes_to_read = 1; 264 break; 265 266 case H4_W4_ACL_HEADER: 267 bytes_to_read = READ_BT_16( hci_packet, 2); 268 h4_state = H4_W4_ACL_PAYLOAD; 269 break; 270 271 case H4_W4_ACL_PAYLOAD: 272 hci_dump_packet( HCI_ACL_DATA_PACKET, 1, hci_packet, read_pos); 273 packet_handler(HCI_ACL_DATA_PACKET, hci_packet, read_pos); 274 h4_state = H4_W4_PACKET_TYPE; 275 read_pos = 0; 276 bytes_to_read = 1; 277 break; 278 } 279 return 0; 280 } 281 282 static const char * h4_get_transport_name(){ 283 return "H4"; 284 } 285 286 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){ 287 } 288 289 // get h4 singleton 290 hci_transport_t * hci_transport_h4_instance() { 291 if (hci_transport_h4 == NULL) { 292 hci_transport_h4 = malloc( sizeof(hci_transport_h4_t)); 293 hci_transport_h4->ds = NULL; 294 hci_transport_h4->transport.open = h4_open; 295 hci_transport_h4->transport.close = h4_close; 296 hci_transport_h4->transport.send_packet = h4_send_packet; 297 hci_transport_h4->transport.register_packet_handler = h4_register_packet_handler; 298 hci_transport_h4->transport.get_transport_name = h4_get_transport_name; 299 } 300 return (hci_transport_t *) hci_transport_h4; 301 } 302