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annotate smpp-trx-sa/tcpconn.c @ 222:9d6e8d99d2b1

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smpp-trx-sa: new program
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 03 Aug 2023 21:13:41 -0800
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children 1bf989f60aa3
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1 /*
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2 * This module implements the part of smpp-trx-sa that handles
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3 * the TCP connection to the SMPP server.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <netinet/in.h>
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9 #include <arpa/inet.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <unistd.h>
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15
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16 extern FILE *logF;
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17
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18 int tcpsock;
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19
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20 static u_char rx_buf[0x10000];
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21 static unsigned rx_accum, rx_pdu_len;
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22 static int rx_body;
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23
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24 void
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25 open_tcp_conn(server_sin)
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26 struct sockaddr_in *server_sin;
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27 {
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28 int rc;
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29
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30 tcpsock = socket(AF_INET, SOCK_STREAM, 0);
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31 if (tcpsock < 0) {
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32 perror("socket(AF_INET, SOCK_STREAM, 0)");
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33 exit(1);
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34 }
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35 rc = connect(tcpsock, (struct sockaddr *) server_sin,
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36 sizeof(struct sockaddr_in));
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37 if (rc < 0) {
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38 perror("TCP connect");
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39 exit(1);
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40 }
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41 }
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42
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43 static void
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44 got_full_pdu()
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45 {
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46 unsigned command_id;
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47
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48 /* prepare for next PDU Rx */
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49 rx_body = 0;
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50 rx_accum = 0;
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51 /* back to the one we just got */
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52 command_id = (rx_buf[4] << 24) | (rx_buf[5] << 16) | (rx_buf[6] << 8) |
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53 rx_buf[7];
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54 if (command_id == 0x15 && rx_pdu_len == 16) {
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55 send_enq_link_resp(rx_buf);
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56 return;
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57 }
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58 log_rx_pdu(rx_buf, rx_pdu_len);
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59 if (command_id == 0x05 || command_id == 0x103)
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60 send_message_resp(rx_buf);
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61 }
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62
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63 void
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64 tcpsock_select_handler()
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65 {
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66 unsigned goal;
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67 int cc;
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68
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69 if (rx_body)
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70 goal = rx_pdu_len;
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71 else
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72 goal = 16;
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73 cc = read(tcpsock, rx_buf + rx_accum, goal - rx_accum);
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74 if (cc < 0) {
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75 perror("read from TCP socket");
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76 log_fatal_error("error reading from TCP socket");
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77 exit(1);
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78 }
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79 if (cc == 0) {
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80 log_fatal_error("Server closed TCP connection");
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81 exit(1);
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82 }
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83 rx_accum += cc;
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84 if (rx_accum < goal)
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85 return;
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86 if (rx_body) {
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87 got_full_pdu();
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88 return;
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89 }
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90 if (rx_buf[0] || rx_buf[1]) {
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91 log_rx_pdu(rx_buf, 16);
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92 fprintf(logF, "Fatal error: length exceeds limit\n");
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93 exit(1);
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94 }
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95 rx_pdu_len = (rx_buf[2] << 8) | rx_buf[3];
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96 if (rx_pdu_len < 16) {
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97 log_rx_pdu(rx_buf, 16);
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98 fprintf(logF, "Fatal error: length below 16\n");
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99 exit(1);
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100 }
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101 if (rx_pdu_len == 16) {
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102 got_full_pdu();
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103 return;
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104 }
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105 rx_body = 1;
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106 }