FreeCalypso > hg > freecalypso-sw

annotate rvinterf/lowlevel/localsock.c @ 1023:cd6002e3aefb

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doc/Freerunner-Howto: apparently some people still use SHR, so mention it too
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Tue, 03 May 2016 13:48:39 +0000
parents 2f285f20d617
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * This rvinterf module handles the local UNIX domain socket interface
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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7 #include <sys/un.h>
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8 #include <stdio.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <stdlib.h>
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12 #include <unistd.h>
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13 #include "../include/localsock.h"
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14 #include "client.h"
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15
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16 int listener;
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17
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18 extern struct client *client_head;
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19 extern int max_fd;
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20 extern char *socket_pathname;
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21 extern int socketpair_fd;
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22
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23 create_listener_socket()
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24 {
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25 /* local socket binding voodoo copied from osmocon */
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26 struct sockaddr_un local;
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27 unsigned int namelen;
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28 int rc;
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29
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30 listener = socket(AF_UNIX, SOCK_STREAM, 0);
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31 if (listener < 0) {
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32 perror("socket(AF_UNIX, SOCK_STREAM, 0)");
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33 exit(1);
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34 }
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35
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36 local.sun_family = AF_UNIX;
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37 strncpy(local.sun_path, socket_pathname, sizeof(local.sun_path));
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38 local.sun_path[sizeof(local.sun_path) - 1] = '\0';
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39 unlink(local.sun_path);
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40
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41 /* we use the same magic that X11 uses in Xtranssock.c for
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42 * calculating the proper length of the sockaddr */
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43 #if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
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44 local.sun_len = strlen(local.sun_path);
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45 #endif
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46 #if defined(BSD44SOCKETS) || defined(SUN_LEN)
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47 namelen = SUN_LEN(&local);
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48 #else
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49 namelen = strlen(local.sun_path) +
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50 offsetof(struct sockaddr_un, sun_path) + 1;
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51 #endif
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52
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53 rc = bind(listener, (struct sockaddr *) &local, namelen);
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54 if (rc != 0) {
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55 perror("bind on local socket");
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56 exit(1);
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57 }
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58 rc = listen(listener, 3);
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59 if (rc != 0) {
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60 perror("listen");
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61 exit(1);
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62 }
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63
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64 if (listener > max_fd)
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65 max_fd = listener;
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66 return(0);
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67 }
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68
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69 static void
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70 prep_for_length_rx(cli)
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71 struct client *cli;
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72 {
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73 cli->rx_state = 0;
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74 cli->rx_ptr = cli->rx_buf;
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75 cli->rx_left = 2;
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76 }
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77
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78 static void
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79 prep_for_message_rx(cli)
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80 struct client *cli;
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81 {
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82 cli->rx_state = 1;
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83 cli->rx_ptr = cli->rx_buf;
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84 cli->rx_left = cli->rx_msglen;
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85 }
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86
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87 handle_listener_select()
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88 {
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89 struct sockaddr_un un_addr;
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90 socklen_t len;
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91 int rc;
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92 struct client *newcli;
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93
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94 len = sizeof(un_addr);
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95 rc = accept(listener, (struct sockaddr *) &un_addr, &len);
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96 if (rc < 0) {
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97 perror("rvinterf: accept");
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98 exit(1);
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99 }
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100 if (rc > max_fd)
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101 max_fd = rc;
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102 newcli = malloc(sizeof(struct client));
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103 if (!newcli) {
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104 perror("rvinterf: malloc for new client");
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105 exit(1);
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106 }
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107 bzero(newcli, sizeof(struct client));
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108 newcli->fd = rc;
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109 newcli->next = client_head;
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110 client_head = newcli;
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111 prep_for_length_rx(newcli);
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112 output_line("*** Client program connected");
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113 return(0);
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114 }
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115
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116 create_socketpair_client()
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117 {
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118 struct client *cli;
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119
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120 if (socketpair_fd > max_fd)
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121 max_fd = socketpair_fd;
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122 cli = malloc(sizeof(struct client));
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123 if (!cli) {
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124 perror("rvinterf: malloc for socketpair client");
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125 exit(1);
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126 }
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127 bzero(cli, sizeof(struct client));
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128 cli->fd = socketpair_fd;
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129 client_head = cli;
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130 prep_for_length_rx(cli);
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131 return(0);
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132 }
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133
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134 send_local_msg_to_client(cli, msg)
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135 struct client *cli;
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136 char *msg;
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137 {
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138 int len, len1;
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139 u_char hdr[3];
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140
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141 len = strlen(msg);
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142 len1 = len + 1;
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143 hdr[0] = len1 >> 8;
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144 hdr[1] = len1 & 0xFF;
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145 hdr[2] = RVI2CLI_LOCAL_CMD_RESP;
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146 write(cli->fd, hdr, 3);
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147 write(cli->fd, msg, len);
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148 }
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149
177
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parents: 173
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150 void
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parents: 173
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151 handle_client_select(cli)
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parents: 173
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152 struct client *cli;
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parents: 173
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153 {
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parents: 173
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154 int cc;
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parents: 173
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155
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parents: 173
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156 cc = read(cli->fd, cli->rx_ptr, cli->rx_left);
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157 if (cc <= 0) {
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158 /* normal client exit condition */
185
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159 output_line("*** Client program disconnected");
177
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parents: 173
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160 close_socket: cli->rx_state = 2;
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161 return;
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162 }
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parents: 173
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163 cli->rx_ptr += cc;
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parents: 173
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164 cli->rx_left -= cc;
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parents: 173
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165 if (cli->rx_left)
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166 return;
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parents: 173
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167 /* got the thing, process it */
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parents: 173
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168 if (cli->rx_state) {
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parents: 173
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169 prep_for_length_rx(cli);
178
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170 process_msg_from_client(cli);
177
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parents: 173
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171 } else {
178
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172 cli->rx_msglen = cli->rx_buf[0] << 8 | cli->rx_buf[1];
177
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parents: 173
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173 if (cli->rx_msglen < 1 || cli->rx_msglen > LOCALSOCK_MAX_MSG) {
178
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parents: 177
diff changeset
174 send_local_msg_to_client(cli,
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 177
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175 "-Invalid length, closing socket");
177
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parents: 173
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176 goto close_socket;
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parents: 173
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177 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 173
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178 prep_for_message_rx(cli);
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parents: 173
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179 }
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parents: 173
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180 }