main.c revision 0f9b91e150e153229235c163861198e23600e636 
1#include <hardware/bluetooth.h>
2#include <netinet/in.h>
3#include <stdio.h>
4#include <string.h>
5#include <sys/socket.h>
6#include <sys/types.h>
7#include <unistd.h>
8
9#include "osi/include/osi.h"
10
11typedef int (*handler_t)(int argc, char **argv);
12
13typedef enum {
14  HCI_PACKET_COMMAND  = 1,
15  HCI_PACKET_ACL_DATA = 2,
16  HCI_PACKET_SCO_DATA = 3,
17  HCI_PACKET_EVENT    = 4,
18} hci_packet_t;
19
20typedef struct {
21  const char *name;
22  const char *help;
23  handler_t handler;
24} command_t;
25
26static int help(int argc, char **argv);
27static int set_discoverable(int argc, char **argv);
28static int set_name(int argc, char **argv);
29static int set_pcm_loopback(int argc, char **argv);
30
31static bool write_hci_command(hci_packet_t type, const void *packet, size_t length);
32static const command_t *find_command(const char *name);
33static void usage(const char *name);
34
35static const command_t commands[] = {
36  { "help", "<command> - shows help text for <command>.", help },
37  { "setDiscoverable", "(true|false) - whether the controller should be discoverable.", set_discoverable },
38  { "setName", "<name> - sets the device's Bluetooth name to <name>.", set_name },
39  { "setPcmLoopback", "(true|false) - enables or disables PCM loopback on the controller.", set_pcm_loopback },
40};
41
42static int help(int argc, char **argv) {
43  if (!argc) {
44    printf("No help command specified.\n");
45    return 1;
46  }
47
48  const command_t *command = find_command(argv[0]);
49  if (!command) {
50    printf("No command named '%s'.\n", argv[0]);
51    return 2;
52  }
53
54  printf("%s %s\n", argv[0], command->help);
55  return 0;
56}
57
58static int set_discoverable(int argc, char **argv) {
59  if (argc != 1) {
60    printf("Discoverable mode not specified.\n");
61    return 1;
62  }
63
64  if (strcmp(argv[0], "true") && strcmp(argv[0], "false")) {
65    printf("Invalid discoverable mode '%s'.\n", argv[0]);
66    return 2;
67  }
68
69  uint8_t packet[] = { 0x1A, 0x0C, 0x01, 0x00 };
70  if (argv[0][0] == 't')
71    packet[ARRAY_SIZE(packet) - 1] = 0x03;
72
73  return !write_hci_command(HCI_PACKET_COMMAND, packet, ARRAY_SIZE(packet));
74}
75
76static int set_name(int argc, char **argv) {
77  if (argc != 1) {
78    printf("Device name not specified.\n");
79    return 1;
80  }
81
82  size_t len = strlen(argv[0]);
83  if (len > 247) {
84    printf("Device name cannot exceed 247 bytes.\n");
85    return 2;
86  }
87
88  uint8_t packet[251] = { 0x13, 0x0C, 248 };
89  memcpy(&packet[3], argv[0], len + 1);
90
91  if (!write_hci_command(HCI_PACKET_COMMAND, packet, sizeof(packet)))
92    return 1;
93
94  memset(&packet[0], sizeof(packet), 0);
95  packet[0] = 0x52;
96  packet[1] = 0x0C;
97  packet[2] = 0xF1;  // HCI command packet length.
98  packet[3] = 0x01;  // FEC required.
99  packet[4] = len + 1;
100  packet[5] = 0x09;  // Device name field tag.
101  memcpy(&packet[6], argv[0], len);
102  return !write_hci_command(HCI_PACKET_COMMAND, packet, 0xF4);
103}
104
105static int set_pcm_loopback(int argc, char **argv) {
106  if (argc != 1) {
107    printf("PCM loopback mode not specified.\n");
108    return 1;
109  }
110
111  if (strcmp(argv[0], "true") && strcmp(argv[0], "false")) {
112    printf("Invalid PCM mode '%s'.\n", argv[0]);
113    return 2;
114  }
115
116  uint8_t packet[] = { 0x24, 0xFC, 0x01, 0x00 };
117  if (argv[0][0] == 't')
118    packet[ARRAY_SIZE(packet) - 1] = 0x01;
119
120  return !write_hci_command(HCI_PACKET_COMMAND, packet, ARRAY_SIZE(packet));
121}
122
123int main(int argc, char **argv) {
124  if (argc < 2) {
125    usage(argv[0]);
126    return -1;
127  }
128
129  const command_t *command = find_command(argv[1]);
130  if (!command) {
131    printf("Unrecognized command '%s'.\n", argv[1]);
132    return -2;
133  }
134
135  if (!command->handler) {
136    printf("Unhandled command '%s'.\n", argv[1]);
137    return -3;
138  }
139
140  return command->handler(argc - 2, &argv[2]);
141}
142
143static bool write_hci_command(hci_packet_t type, const void *packet, size_t length) {
144  int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
145  if (sock == INVALID_FD)
146    goto error;
147
148  struct sockaddr_in addr;
149  addr.sin_family = AF_INET;
150  addr.sin_addr.s_addr = htonl(0x7F000001);
151  addr.sin_port = htons(8873);
152  if (connect(sock, (const struct sockaddr *)&addr, sizeof(addr)) == -1)
153    goto error;
154
155  if (send(sock, &type, 1, 0) != 1)
156    goto error;
157
158  if (send(sock, &length, 2, 0) != 2)
159    goto error;
160
161  if (send(sock, packet, length, 0) != (ssize_t)length)
162    goto error;
163
164  close(sock);
165  return true;
166
167error:;
168  close(sock);
169  return false;
170}
171
172static const command_t *find_command(const char *name) {
173  for (size_t i = 0; i < ARRAY_SIZE(commands); ++i)
174    if (!strcmp(commands[i].name, name))
175      return &commands[i];
176  return NULL;
177}
178
179static void usage(const char *name) {
180  printf("Usage: %s <command> [options]\n", name);
181  printf("Commands:\n");
182  for (size_t i = 0; i < ARRAY_SIZE(commands); ++i)
183    printf("  %s\n", commands[i].name);
184  printf("For detailed help on a command, run '%s help <command>'.\n", name);
185}
186