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annotate rvinterf/lowlevel/localsock.c @ 177:fef035264dd4

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rvinterf: beginning of local socket handling
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sat, 23 Nov 2013 20:15:02 +0000
parents rvinterf/old/rvtdump_tx.c@f42854da4563
children 7ab6b29e76bb
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 "../localsock.h"
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14 #include "client.h"
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15
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16 static char sockpath[] = "/tmp/rvinterf_socket";
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17
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18 int listener;
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19
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20 extern struct client *client_head;
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21 extern int max_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, sockpath, 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 newcli = malloc(sizeof(struct client));
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101 if (!newcli) {
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102 perror("rvinterf: malloc for new client");
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103 exit(1);
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104 }
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105 bzero(newcli, sizeof(struct client));
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106 newcli->fd = rc;
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107 newcli->next = client_head;
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108 client_head = newcli;
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109 prep_for_length_rx(newcli);
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110 return(0);
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111 }
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112
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113 void
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114 handle_client_select(cli)
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115 struct client *cli;
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116 {
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117 int cc;
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118
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119 cc = read(cli->fd, cli->rx_ptr, cli->rx_left);
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120 if (cc <= 0) {
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121 /* normal client exit condition */
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122 close_socket: cli->rx_state = 2;
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123 return;
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124 }
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125 cli->rx_ptr += cc;
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126 cli->rx_left -= cc;
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127 if (cli->rx_left)
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128 return;
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129 /* got the thing, process it */
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130 if (cli->rx_state) {
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131 prep_for_length_rx(cli);
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132 /* process_msg_from_client(cli); */
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133 } else {
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134 cli->rx_msglen = *(u_short *)cli->rx_buf;
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135 if (cli->rx_msglen < 1 || cli->rx_msglen > LOCALSOCK_MAX_MSG) {
fef035264dd4 rvinterf: beginning of local socket handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 173
diff changeset
136 /* TODO: report invalid length to the client */
fef035264dd4 rvinterf: beginning of local socket handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 173
diff changeset
137 goto close_socket;
fef035264dd4 rvinterf: beginning of local socket handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 173
diff changeset
138 }
fef035264dd4 rvinterf: beginning of local socket handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 173
diff changeset
139 prep_for_message_rx(cli);
fef035264dd4 rvinterf: beginning of local socket handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 173
diff changeset
140 }
fef035264dd4 rvinterf: beginning of local socket handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 173
diff changeset
141 }