FreeCalypso > hg > themwi-system-sw

annotate mgw/ctrl_sock.c @ 32:b3f74df7b808

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beginning of themwi-mgw
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Jul 2022 22:51:44 -0800
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children db7ed6a55ba4
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32
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * In this module we implement the logic of listening on the
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Mychaela Falconia <falcon@freecalypso.org>
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3 * TMGW control socket and accepting control connections.
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Mychaela Falconia <falcon@freecalypso.org>
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4 */
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Mychaela Falconia <falcon@freecalypso.org>
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5
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Mychaela Falconia <falcon@freecalypso.org>
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6 #include <sys/types.h>
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Mychaela Falconia <falcon@freecalypso.org>
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7 #include <sys/socket.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <sys/un.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <netinet/in.h>
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Mychaela Falconia <falcon@freecalypso.org>
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10 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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11 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
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12 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
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13 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
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14 #include <syslog.h>
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Mychaela Falconia <falcon@freecalypso.org>
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15 #include <unistd.h>
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Mychaela Falconia <falcon@freecalypso.org>
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16 #include "struct.h"
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Mychaela Falconia <falcon@freecalypso.org>
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17 #include "select.h"
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Mychaela Falconia <falcon@freecalypso.org>
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18
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Mychaela Falconia <falcon@freecalypso.org>
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19 static char ctrl_socket_pathname[] = "/var/gsm/tmgw_socket";
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Mychaela Falconia <falcon@freecalypso.org>
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20
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Mychaela Falconia <falcon@freecalypso.org>
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21 extern void ctrl_message_handler();
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Mychaela Falconia <falcon@freecalypso.org>
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22
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Mychaela Falconia <falcon@freecalypso.org>
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23 void
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Mychaela Falconia <falcon@freecalypso.org>
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24 ctrlsock_accept_handler(listener_fd)
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Mychaela Falconia <falcon@freecalypso.org>
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25 {
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Mychaela Falconia <falcon@freecalypso.org>
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26 struct sockaddr_un sa;
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Mychaela Falconia <falcon@freecalypso.org>
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27 socklen_t sa_len;
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Mychaela Falconia <falcon@freecalypso.org>
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28 int conn_fd;
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Mychaela Falconia <falcon@freecalypso.org>
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29 struct ctrl_conn *conn;
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Mychaela Falconia <falcon@freecalypso.org>
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30
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Mychaela Falconia <falcon@freecalypso.org>
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31 sa_len = sizeof sa;
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Mychaela Falconia <falcon@freecalypso.org>
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32 conn_fd = accept(listener_fd, (struct sockaddr *) &sa, &sa_len);
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Mychaela Falconia <falcon@freecalypso.org>
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33 if (conn_fd < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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34 syslog(LOG_CRIT, "accept on UNIX socket: %m");
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Mychaela Falconia <falcon@freecalypso.org>
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35 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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36 }
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Mychaela Falconia <falcon@freecalypso.org>
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37 conn = malloc(sizeof(struct ctrl_conn));
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Mychaela Falconia <falcon@freecalypso.org>
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38 if (!conn) {
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Mychaela Falconia <falcon@freecalypso.org>
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39 syslog(LOG_CRIT, "malloc for ctrl socket conn: %m");
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Mychaela Falconia <falcon@freecalypso.org>
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40 close(conn_fd);
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Mychaela Falconia <falcon@freecalypso.org>
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41 return;
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Mychaela Falconia <falcon@freecalypso.org>
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42 }
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Mychaela Falconia <falcon@freecalypso.org>
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43 bzero(conn, sizeof(struct ctrl_conn));
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Mychaela Falconia <falcon@freecalypso.org>
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44 update_max_fd(conn_fd);
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Mychaela Falconia <falcon@freecalypso.org>
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45 FD_SET(conn_fd, &select_for_read);
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Mychaela Falconia <falcon@freecalypso.org>
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46 select_handlers[conn_fd] = ctrl_message_handler;
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Mychaela Falconia <falcon@freecalypso.org>
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47 select_data[conn_fd] = (void *) conn;
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Mychaela Falconia <falcon@freecalypso.org>
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48 syslog(LOG_INFO, "accepted ctrl connection");
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Mychaela Falconia <falcon@freecalypso.org>
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49 }
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Mychaela Falconia <falcon@freecalypso.org>
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50
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Mychaela Falconia <falcon@freecalypso.org>
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51 create_ctrl_socket()
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Mychaela Falconia <falcon@freecalypso.org>
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52 {
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Mychaela Falconia <falcon@freecalypso.org>
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53 struct sockaddr_un sa;
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Mychaela Falconia <falcon@freecalypso.org>
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54 unsigned sa_len;
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Mychaela Falconia <falcon@freecalypso.org>
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55 int fd, rc;
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Mychaela Falconia <falcon@freecalypso.org>
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56
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Mychaela Falconia <falcon@freecalypso.org>
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57 fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
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Mychaela Falconia <falcon@freecalypso.org>
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58 if (fd < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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59 syslog(LOG_CRIT, "socket(AF_UNIX, SOCK_SEQPACKET, 0): %m");
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Mychaela Falconia <falcon@freecalypso.org>
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60 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
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61 }
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Mychaela Falconia <falcon@freecalypso.org>
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62 unlink(ctrl_socket_pathname);
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Mychaela Falconia <falcon@freecalypso.org>
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63 fill_sockaddr_un(ctrl_socket_pathname, &sa, &sa_len);
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Mychaela Falconia <falcon@freecalypso.org>
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64 rc = bind(fd, (struct sockaddr *) &sa, sa_len);
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Mychaela Falconia <falcon@freecalypso.org>
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65 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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66 syslog(LOG_ERR, "bind to %s: %m", ctrl_socket_pathname);
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Mychaela Falconia <falcon@freecalypso.org>
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67 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
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68 }
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Mychaela Falconia <falcon@freecalypso.org>
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69 rc = listen(fd, 3);
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Mychaela Falconia <falcon@freecalypso.org>
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70 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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71 syslog(LOG_CRIT, "listen on UNIX socket: %m");
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Mychaela Falconia <falcon@freecalypso.org>
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72 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
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73 }
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Mychaela Falconia <falcon@freecalypso.org>
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74 update_max_fd(fd);
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Mychaela Falconia <falcon@freecalypso.org>
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75 FD_SET(fd, &select_for_read);
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Mychaela Falconia <falcon@freecalypso.org>
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76 select_handlers[fd] = ctrlsock_accept_handler;
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Mychaela Falconia <falcon@freecalypso.org>
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77 return(0);
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Mychaela Falconia <falcon@freecalypso.org>
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78 }