1 | /* |
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2 | * Copyright (c) 2016 Chris Johns <chrisj@rtems.org>. All rights reserved. |
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3 | * |
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4 | * Redistribution and use in source and binary forms, with or without |
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5 | * modification, are permitted provided that the following conditions |
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6 | * are met: |
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7 | * 1. Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * 2. Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * |
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13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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23 | * SUCH DAMAGE. |
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24 | */ |
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25 | |
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26 | #include <errno.h> |
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27 | #include <stdlib.h> |
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28 | #include <unistd.h> |
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29 | |
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30 | #include <arpa/inet.h> |
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31 | #include <netinet/in.h> |
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32 | #include <netinet/tcp.h> |
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33 | #include <sys/types.h> |
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34 | #include <sys/socket.h> |
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35 | |
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36 | #include <rtems/rtems-debugger.h> |
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37 | #include <rtems/debugger/rtems-debugger-server.h> |
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38 | #include <rtems/debugger/rtems-debugger-remote.h> |
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39 | |
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40 | #include <rtems/rtems-debugger-remote-tcp.h> |
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41 | |
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42 | /** |
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43 | * Debugger default server port. 'RT' as ASCII. |
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44 | */ |
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45 | #define RTEMS_DB_PORT_DEFAULT (8284) |
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46 | |
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47 | /** |
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48 | * TCP Remote data. |
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49 | */ |
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50 | typedef struct |
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51 | { |
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52 | int fd; |
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53 | int port; |
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54 | } rtems_debugger_remote_tcp; |
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55 | |
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56 | static rtems_debugger_remote_tcp* |
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57 | tcp_remote(rtems_debugger_remote* remote) |
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58 | { |
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59 | rtems_debugger_remote_tcp* tcp = NULL; |
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60 | rtems_debugger_lock(); |
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61 | if (remote != NULL && remote->data != NULL) |
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62 | tcp = (rtems_debugger_remote_tcp*) remote->data; |
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63 | rtems_debugger_unlock(); |
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64 | return tcp; |
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65 | } |
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66 | |
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67 | static int |
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68 | tcp_remote_begin(rtems_debugger_remote* remote, const char* device) |
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69 | { |
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70 | rtems_debugger_remote_tcp* tcp; |
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71 | int port; |
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72 | char* end; |
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73 | |
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74 | rtems_debugger_lock(); |
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75 | |
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76 | /* |
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77 | * Parse the port number. |
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78 | */ |
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79 | port = strtoul(device, &end, 10); |
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80 | if (port == 0 || *end != '\0') { |
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81 | rtems_debugger_printf("error: rtems-db: tcp remote: invalid port: %s\n", device); |
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82 | return -1; |
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83 | } |
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84 | |
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85 | tcp = malloc(sizeof(rtems_debugger_remote_tcp)); |
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86 | if (tcp == NULL) { |
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87 | errno = ENOMEM; |
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88 | return -1; |
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89 | } |
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90 | |
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91 | remote->data = tcp; |
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92 | |
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93 | tcp->fd = -1; |
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94 | tcp->port = port; |
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95 | |
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96 | rtems_debugger_unlock(); |
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97 | |
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98 | return 0; |
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99 | } |
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100 | |
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101 | static int |
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102 | tcp_remote_end(rtems_debugger_remote* remote) |
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103 | { |
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104 | rtems_debugger_lock(); |
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105 | |
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106 | if (remote != NULL && remote->data != NULL) { |
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107 | rtems_debugger_remote_tcp* tcp = (rtems_debugger_remote_tcp*) remote->data; |
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108 | if (tcp != NULL) { |
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109 | if (tcp->fd >= 0) |
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110 | close(tcp->fd); |
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111 | free(tcp); |
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112 | remote->data = NULL; |
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113 | } |
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114 | } |
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115 | |
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116 | rtems_debugger_unlock(); |
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117 | |
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118 | return 0; |
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119 | } |
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120 | |
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121 | static int |
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122 | tcp_remote_connect(rtems_debugger_remote* remote) |
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123 | { |
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124 | int ld; |
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125 | struct sockaddr_in addr; |
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126 | socklen_t opt; |
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127 | socklen_t len; |
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128 | bool running; |
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129 | struct timeval timeout; |
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130 | rtems_debugger_remote_tcp* tcp = tcp_remote(remote); |
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131 | int r; |
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132 | |
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133 | if (rtems_debugger_verbose()) |
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134 | rtems_debugger_printf("error: rtems-db: tcp remote: connect\n"); |
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135 | |
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136 | ld = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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137 | if (ld < 0) { |
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138 | rtems_debugger_printf("error: rtems-db: tcp remote: socket: (%d) %s\n", |
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139 | errno, strerror(errno)); |
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140 | return -1; |
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141 | } |
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142 | |
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143 | opt = 1; |
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144 | r = setsockopt(ld, |
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145 | SOL_SOCKET, |
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146 | SO_REUSEADDR, |
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147 | (char *) &opt, |
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148 | sizeof(opt)); |
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149 | if (r < 0) { |
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150 | close(ld); |
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151 | rtems_debugger_printf("error: rtems-db: tcp remote: setsocket: reuseaddr: (%d) %s\n", |
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152 | errno, strerror(errno)); |
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153 | return -1; |
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154 | } |
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155 | |
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156 | addr.sin_family = PF_INET; |
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157 | addr.sin_port = htons(tcp->port); |
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158 | addr.sin_addr.s_addr = INADDR_ANY; |
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159 | |
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160 | r = bind(ld, (struct sockaddr *) &addr, sizeof(addr)); |
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161 | if (r < 0) { |
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162 | close(ld); |
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163 | rtems_debugger_printf("error: rtems-db: tcp remote: bind: (%d) %s\n", |
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164 | errno, strerror(errno)); |
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165 | return -1; |
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166 | } |
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167 | |
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168 | /* |
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169 | * Backlog of 1 connection. |
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170 | */ |
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171 | r = listen(ld, 1); |
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172 | if (r < 0) { |
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173 | close(ld); |
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174 | rtems_debugger_printf("error: rtems-db: tcp remote: listen: (%d) %s\n", |
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175 | errno, strerror(errno)); |
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176 | return -1; |
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177 | } |
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178 | |
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179 | /* |
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180 | * Use a random port if the port is 0. |
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181 | */ |
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182 | if (tcp->port == 0) { |
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183 | len = sizeof(addr); |
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184 | r = getsockname(ld, (struct sockaddr *) &addr, &len); |
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185 | if (r < 0 || len < sizeof(addr)) { |
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186 | close(ld); |
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187 | rtems_debugger_printf("error: rtems-db: tcp remote: getsockname: (%d) %s\n", |
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188 | errno, strerror(errno)); |
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189 | return -1; |
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190 | } |
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191 | tcp->port = ntohs(addr.sin_port); |
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192 | } |
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193 | |
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194 | rtems_debugger_printf("rtems-db: tcp remote: listing on port: %d\n", |
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195 | tcp->port); |
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196 | |
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197 | len = sizeof(addr); |
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198 | tcp->fd = accept(ld, (struct sockaddr *) &addr, &len); |
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199 | |
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200 | running = rtems_debugger_server_running(); |
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201 | |
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202 | close(ld); |
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203 | |
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204 | if (tcp->fd < 0) { |
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205 | /* |
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206 | * EBADF means the socket has been closed, ignore it. |
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207 | */ |
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208 | if (errno != EBADF) |
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209 | rtems_debugger_printf("error: rtems-db: accept: (%d) %s\n", |
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210 | errno, strerror(errno)); |
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211 | return -1; |
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212 | } |
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213 | |
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214 | if (!running) { |
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215 | close(tcp->fd); |
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216 | errno = EIO; |
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217 | return -1; |
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218 | } |
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219 | |
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220 | opt = 1; |
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221 | r = setsockopt(tcp->fd, |
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222 | SOL_SOCKET, SO_KEEPALIVE, |
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223 | (char*) &opt, |
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224 | sizeof(opt)); |
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225 | if (r < 0) { |
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226 | int errno_ = errno; |
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227 | close(tcp->fd); |
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228 | rtems_debugger_printf("error: rtems-db: tcp remote: set keepalive: (%d) %s\n", |
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229 | errno, strerror(errno)); |
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230 | errno = errno_; |
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231 | return -1; |
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232 | } |
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233 | |
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234 | opt = 1; |
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235 | r = setsockopt(tcp->fd, |
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236 | IPPROTO_TCP, TCP_NODELAY, |
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237 | (char*) &opt, sizeof(opt)); |
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238 | if (r < 0) { |
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239 | int errno_ = errno; |
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240 | close(tcp->fd); |
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241 | rtems_debugger_printf("error: rtems-db: tcp remote: set no-delay: (%d) %s\n", |
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242 | errno, strerror(errno)); |
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243 | errno = errno_; |
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244 | return -1; |
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245 | } |
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246 | |
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247 | timeout.tv_sec = rtems_debugger->timeout; |
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248 | timeout.tv_usec = 0; |
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249 | |
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250 | r = setsockopt(tcp->fd, |
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251 | SOL_SOCKET, SO_RCVTIMEO, |
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252 | (char*) &timeout, sizeof(timeout)); |
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253 | if (r < 0) { |
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254 | int errno_ = errno; |
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255 | close(tcp->fd); |
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256 | rtems_debugger_printf("error: rtems-db: tcp remote: set rcv-timeout: (%d) %s\n", |
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257 | errno, strerror(errno)); |
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258 | errno = errno_; |
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259 | return -1; |
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260 | } |
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261 | |
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262 | rtems_debugger_printf("rtems-db: tcp remote: connect host: %s\n", |
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263 | inet_ntoa(addr.sin_addr)); |
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264 | |
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265 | return 0; |
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266 | } |
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267 | |
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268 | static int |
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269 | tcp_remote_disconnect(rtems_debugger_remote* remote) |
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270 | { |
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271 | rtems_debugger_remote_tcp* tcp; |
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272 | |
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273 | rtems_debugger_lock(); |
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274 | |
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275 | rtems_debugger_printf("rtems-db: tcp remote: disconnect host\n"); |
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276 | |
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277 | tcp = (rtems_debugger_remote_tcp*) remote->data; |
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278 | close(tcp->fd); |
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279 | tcp->fd = -1; |
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280 | |
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281 | rtems_debugger_unlock(); |
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282 | |
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283 | return 0; |
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284 | } |
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285 | |
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286 | static bool |
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287 | tcp_remote_isconnected(rtems_debugger_remote* remote) |
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288 | { |
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289 | rtems_debugger_remote_tcp* tcp = tcp_remote(remote); |
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290 | return tcp != NULL && tcp->fd >= 0; |
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291 | } |
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292 | |
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293 | static ssize_t |
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294 | tcp_remote_receive(rtems_debugger_remote* remote, |
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295 | void* buf, |
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296 | size_t nbytes) |
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297 | { |
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298 | rtems_debugger_remote_tcp* tcp = tcp_remote(remote); |
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299 | ssize_t len; |
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300 | if (tcp != NULL) { |
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301 | len = read(tcp->fd, buf, nbytes); |
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302 | } |
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303 | else { |
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304 | errno = EIO; |
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305 | len = -1; |
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306 | } |
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307 | return len; |
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308 | } |
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309 | |
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310 | static ssize_t |
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311 | tcp_remote_send(rtems_debugger_remote* remote, |
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312 | const void* buf, |
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313 | size_t nbytes) |
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314 | { |
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315 | rtems_debugger_remote_tcp* tcp = tcp_remote(remote); |
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316 | ssize_t len; |
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317 | if (tcp != NULL) { |
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318 | len = write(tcp->fd, buf, nbytes); |
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319 | } |
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320 | else { |
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321 | errno = EIO; |
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322 | len = -1; |
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323 | } |
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324 | return len; |
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325 | } |
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326 | |
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327 | static rtems_debugger_remote remote_tcp = |
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328 | { |
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329 | .name = "tcp", |
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330 | .begin = tcp_remote_begin, |
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331 | .end = tcp_remote_end, |
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332 | .connect = tcp_remote_connect, |
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333 | .disconnect = tcp_remote_disconnect, |
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334 | .isconnected = tcp_remote_isconnected, |
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335 | .read = tcp_remote_receive, |
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336 | .write = tcp_remote_send |
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337 | }; |
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338 | |
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339 | int |
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340 | rtems_debugger_register_tcp_remote(void) |
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341 | { |
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342 | return rtems_debugger_remote_register(&remote_tcp); |
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343 | } |
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