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annotate smsc-daemon/gsup_rx.c @ 15:ce6bcb84ca30

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doc/Proto-SMSC-testing: document written
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 27 Aug 2023 21:47:19 -0800
parents 81386a48c463
children
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1 /*
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2 * This C module is part of proto-smsc-daemon concoction, a prototype/test
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3 * implementation of a GSUP-based GSM SMSC. It is based on the osmo-euse-demo
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4 * program from OsmoHLR package.
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5 *
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6 * proto-smsc-daemon author: Mychaela N. Falconia <falcon@freecalypso.org>,
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7 * no copyright.
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8 *
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9 * osmo-euse-demo author: Harald Welte <laforge@gnumonks.org>, (C) 2018, AGPL3+
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10 */
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11
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12 #include <ctype.h>
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13 #include <string.h>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <errno.h>
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17 #include <signal.h>
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18
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19 #include <osmocom/core/msgb.h>
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20 #include <osmocom/core/select.h>
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21 #include <osmocom/core/application.h>
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22 #include <osmocom/core/utils.h>
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23 #include <osmocom/core/logging.h>
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24
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25 #include <osmocom/gsm/gsup.h>
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26
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27 #include <osmocom/gsupclient/gsup_client.h>
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29 #include "logging.h"
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30
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31 extern void record_mo_sm(struct osmo_gsup_message *gmsg);
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32
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33 extern char smsc_ipa_name[];
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34
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35 static void send_gsup_response(struct osmo_gsup_client *gsupc,
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36 struct osmo_gsup_message *orig_msg)
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37 {
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38 struct osmo_gsup_message resp = {0};
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39 struct msgb *resp_msg;
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40
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41 resp.message_type = OSMO_GSUP_TO_MSGT_RESULT(orig_msg->message_type);
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42 OSMO_STRLCPY_ARRAY(resp.imsi, orig_msg->imsi);
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43 resp.message_class = OSMO_GSUP_MESSAGE_CLASS_SMS;
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44 resp.sm_rp_mr = orig_msg->sm_rp_mr;
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45 resp.source_name = smsc_ipa_name;
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46 resp.source_name_len = strlen(smsc_ipa_name) + 1;
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47 resp.destination_name = orig_msg->source_name;
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48 resp.destination_name_len = orig_msg->source_name_len;
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49
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50 resp_msg = osmo_gsup_client_msgb_alloc();
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51 OSMO_ASSERT(resp_msg);
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52 osmo_gsup_encode(resp_msg, &resp);
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53 osmo_gsup_client_send(gsupc, resp_msg);
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54 }
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55
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56 static void handle_mo_forward_sm(struct osmo_gsup_client *gsupc,
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57 struct osmo_gsup_message *gmsg)
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58 {
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59 if (!gmsg->sm_rp_mr) {
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60 LOGP(DMAIN, LOGL_ERROR,
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61 "error in MO-FORWARD-SM: missing SM-RP-MR\n");
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62 return;
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63 }
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64 if (!gmsg->sm_rp_da_type) {
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65 LOGP(DMAIN, LOGL_ERROR,
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66 "error in MO-FORWARD-SM: missing SM-RP-DA\n");
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67 return;
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68 }
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69 if (!gmsg->sm_rp_oa_type) {
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70 LOGP(DMAIN, LOGL_ERROR,
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71 "error in MO-FORWARD-SM: missing SM-RP-OA\n");
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72 return;
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73 }
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74 if (!gmsg->sm_rp_ui) {
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75 LOGP(DMAIN, LOGL_ERROR,
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76 "error in MO-FORWARD-SM: missing SM-RP-UI\n");
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77 return;
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78 }
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79 record_mo_sm(gmsg);
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80 send_gsup_response(gsupc, gmsg);
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81 }
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82
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83 static void handle_ready_for_sm(struct osmo_gsup_client *gsupc,
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84 struct osmo_gsup_message *gmsg)
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85 {
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86 if (!gmsg->sm_rp_mr) {
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87 LOGP(DMAIN, LOGL_ERROR,
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88 "error in READY-FOR-SM: missing SM-RP-MR\n");
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89 return;
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90 }
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91 send_gsup_response(gsupc, gmsg);
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92 }
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93
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94 int gsupc_read_cb(struct osmo_gsup_client *gsupc, struct msgb *msg)
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95 {
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96 struct osmo_gsup_message gsup_msg = {0};
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97 int rc;
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98
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99 rc = osmo_gsup_decode(msgb_l2(msg), msgb_l2len(msg), &gsup_msg);
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100 if (rc < 0) {
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101 LOGP(DMAIN, LOGL_ERROR, "Error decoding GSUP: %s\n", msgb_hexdump(msg));
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102 return rc;
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103 }
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104 DEBUGP(DMAIN, "Rx GSUP %s: %s\n", osmo_gsup_message_type_name(gsup_msg.message_type),
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105 msgb_hexdump(msg));
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106
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107 switch (gsup_msg.message_type) {
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108 case OSMO_GSUP_MSGT_MO_FORWARD_SM_REQUEST:
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109 handle_mo_forward_sm(gsupc, &gsup_msg);
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110 break;
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111 case OSMO_GSUP_MSGT_READY_FOR_SM_REQUEST:
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112 handle_ready_for_sm(gsupc, &gsup_msg);
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113 break;
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114 default:
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115 LOGP(DMAIN, LOGL_ERROR, "Unhandled GSUP message type %s\n",
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116 osmo_gsup_message_type_name(gsup_msg.message_type));
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117 break;
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118 }
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119
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120 msgb_free(msg);
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121 return 0;
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122 }