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annotate euse-demo/osmo-euse-demo.c @ 2:2067c55e2c79

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osmo-euse-demo: the printing of argc is downright silly
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 01 Aug 2023 17:23:44 -0800
parents d87e6dbd32c2
children
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1 /* osmo-demo-euse: An External USSD Entity (EUSE) for demo purpose */
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2
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3 /* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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4 *
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5 * All Rights Reserved
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6 *
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7 * This program is free software; you can redistribute it and/or modify
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8 * it under the terms of the GNU Affero General Public License as published by
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9 * the Free Software Foundation; either version 3 of the License, or
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10 * (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 * GNU Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 * This program illustrates how to implement an external USSD application using
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23 * the existing osmocom libraries, particularly libosmocore, libosmogsm and libosmo-gsup-client.
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24 *
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25 * It will receive any MS-originated USSD message that is routed to it via the HLR, and
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26 * simply respond it quoted in the following string: 'You sent "foobar"' (assuming the original
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27 * message was 'foobar').
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28 */
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29
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30 #include <string.h>
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31 #include <stdio.h>
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32 #include <errno.h>
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33 #include <signal.h>
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34
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35 #include <osmocom/core/msgb.h>
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36 #include <osmocom/core/select.h>
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37 #include <osmocom/core/application.h>
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38 #include <osmocom/core/utils.h>
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39 #include <osmocom/core/logging.h>
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40
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41 #include <osmocom/gsm/gsup.h>
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42 #include <osmocom/gsm/gsm0480.h>
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43 #include <osmocom/gsm/protocol/gsm_04_80.h>
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44
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45 #include <osmocom/gsupclient/gsup_client.h>
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46
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47 /* logging categories */
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48 enum {
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49 DMAIN,
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50 };
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51
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52 static struct osmo_gsup_client *g_gc;
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53
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54 /*! send a SS/USSD response to a given imsi/session.
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55 * \param[in] gsupc GSUP client connection through which to send
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56 * \param[in] imsi IMSI of the subscriber
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57 * \param[in] session_id Unique identifier of SS session for which this response is
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58 * \param[in] gsup_msg_type GSUP message type (OSMO_GSUP_MSGT_PROC_SS_{REQUEST,RESULT,ERROR})
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59 * \param[in] final Is this the final result (true=END) or an intermediate result (false=CONTINUE)
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60 * \param[in] msg Optional binary/BER encoded SS date (for FACILITY IE). Can be NULL. Freed in
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61 * this function call.
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62 */
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63 static int euse_tx_ss(struct osmo_gsup_client *gsupc, const char *imsi, uint32_t session_id,
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64 enum osmo_gsup_message_type gsup_msg_type, bool final, struct msgb *ss_msg)
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65 {
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66 struct osmo_gsup_message resp = {0};
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67 struct msgb *resp_msg;
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68
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69 switch (gsup_msg_type) {
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70 case OSMO_GSUP_MSGT_PROC_SS_REQUEST:
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71 case OSMO_GSUP_MSGT_PROC_SS_RESULT:
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72 case OSMO_GSUP_MSGT_PROC_SS_ERROR:
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73 break;
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74 default:
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75 msgb_free(ss_msg);
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76 return -EINVAL;
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77 }
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78
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79 resp.message_type = gsup_msg_type;
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80 OSMO_STRLCPY_ARRAY(resp.imsi, imsi);
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81 if (final)
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82 resp.session_state = OSMO_GSUP_SESSION_STATE_END;
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83 else
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84 resp.session_state = OSMO_GSUP_SESSION_STATE_CONTINUE;
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85 resp.session_id = session_id;
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86 if (ss_msg) {
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87 resp.ss_info = msgb_data(ss_msg);
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88 resp.ss_info_len = msgb_length(ss_msg);
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89 }
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90
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91 resp_msg = gsm0480_msgb_alloc_name(__func__);
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92 OSMO_ASSERT(resp_msg);
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93 osmo_gsup_encode(resp_msg, &resp);
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94 msgb_free(ss_msg);
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95 return osmo_gsup_client_send(gsupc, resp_msg);
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96 }
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97
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98 /*! send a SS/USSD reject to a given IMSI/session.
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99 * \param[in] gsupc GSUP client connection through which to send
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100 * \param[in] imsi IMSI of the subscriber
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101 * \param[in] session_id Unique identifier of SS session for which this response is
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102 * \param[in] invoke_id InvokeID of the request
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103 * \param[in] problem_tag Problem code tag (table 3.13)
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104 * \param[in] problem_code Problem code (table 3.14-3.17)
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105 */
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106 static int euse_tx_ussd_reject(struct osmo_gsup_client *gsupc, const char *imsi, uint32_t session_id,
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107 int invoke_id, uint8_t problem_tag, uint8_t problem_code)
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108 {
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109 struct msgb *msg = gsm0480_gen_reject(invoke_id, problem_tag, problem_code);
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110 LOGP(DMAIN, LOGL_NOTICE, "Tx %s/0x%08x: Reject(%d, 0x%02x, 0x%02x)\n", imsi, session_id,
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111 invoke_id, problem_tag, problem_code);
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112 OSMO_ASSERT(msg);
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113 return euse_tx_ss(gsupc, imsi, session_id, OSMO_GSUP_MSGT_PROC_SS_RESULT, true, msg);
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114 }
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115
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116 /*! send a SS/USSD response in 7-bit GSM default alphabet o a given imsi/session.
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117 * \param[in] gsupc GSUP client connection through which to send
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118 * \param[in] imsi IMSI of the subscriber
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119 * \param[in] session_id Unique identifier of SS session for which this response is
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120 * \param[in] final Is this the final result (true=END) or an intermediate result
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121 * (false=CONTINUE)
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122 * \param[in] invoke_id InvokeID of the request
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123 */
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124 static int euse_tx_ussd_resp_7bit(struct osmo_gsup_client *gsupc, const char *imsi, uint32_t session_id,
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125 bool final, uint8_t invoke_id, const char *text)
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126 {
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127 struct msgb *ss_msg;
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128
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129 /* encode response; remove L3 header */
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130 ss_msg = gsm0480_gen_ussd_resp_7bit(invoke_id, text);
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131 LOGP(DMAIN, LOGL_DEBUG, "Tx %s/0x%08x: USSD Result(%d, %s, '%s')\n", imsi, session_id,
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132 invoke_id, final ? "END" : "CONTINUE", text);
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133 OSMO_ASSERT(ss_msg);
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134 return euse_tx_ss(gsupc, imsi, session_id, OSMO_GSUP_MSGT_PROC_SS_RESULT, final, ss_msg);
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135 }
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136
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137 static int euse_rx_proc_ss_req(struct osmo_gsup_client *gsupc, const struct osmo_gsup_message *gsup)
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138 {
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139 char buf[GSM0480_USSD_7BIT_STRING_LEN+1];
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140 struct ss_request req = {0};
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141
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142 if (gsup->ss_info && gsup->ss_info_len) {
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143 if (gsm0480_parse_facility_ie(gsup->ss_info, gsup->ss_info_len, &req)) {
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144 return euse_tx_ussd_reject(gsupc, gsup->imsi, gsup->session_id, -1,
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145 GSM_0480_PROBLEM_CODE_TAG_GENERAL,
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146 GSM_0480_GEN_PROB_CODE_BAD_STRUCTURE);
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147 }
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148 }
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149
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150 LOGP(DMAIN, LOGL_INFO, "Rx %s/0x%08x: USSD SessionState=%s, OpCode=%s, '%s'\n", gsup->imsi,
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151 gsup->session_id, osmo_gsup_session_state_name(gsup->session_state),
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152 gsm0480_op_code_name(req.opcode), req.ussd_text);
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153
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154 /* we only handle single-request-response USSD in this demo */
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155 if (gsup->session_state != OSMO_GSUP_SESSION_STATE_BEGIN) {
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156 return euse_tx_ussd_reject(gsupc, gsup->imsi, gsup->session_id, req.invoke_id,
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157 GSM_0480_PROBLEM_CODE_TAG_GENERAL,
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158 GSM_0480_GEN_PROB_CODE_UNRECOGNISED);
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159 }
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160
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161 snprintf(buf, sizeof(buf), "You sent \"%s\"", req.ussd_text);
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162 return euse_tx_ussd_resp_7bit(gsupc, gsup->imsi, gsup->session_id, true, req.invoke_id, buf);
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163 }
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164
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165 static int gsupc_read_cb(struct osmo_gsup_client *gsupc, struct msgb *msg)
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166 {
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167 struct osmo_gsup_message gsup_msg = {0};
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168 int rc;
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169
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170 rc = osmo_gsup_decode(msgb_l2(msg), msgb_l2len(msg), &gsup_msg);
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171 if (rc < 0) {
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172 LOGP(DMAIN, LOGL_ERROR, "Error decoding GSUP: %s\n", msgb_hexdump(msg));
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173 return rc;
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174 }
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175 DEBUGP(DMAIN, "Rx GSUP %s: %s\n", osmo_gsup_message_type_name(gsup_msg.message_type),
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176 msgb_hexdump(msg));
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177
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178 switch (gsup_msg.message_type) {
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179 case OSMO_GSUP_MSGT_PROC_SS_REQUEST:
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180 case OSMO_GSUP_MSGT_PROC_SS_RESULT:
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181 euse_rx_proc_ss_req(gsupc, &gsup_msg);
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182 break;
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183 case OSMO_GSUP_MSGT_PROC_SS_ERROR:
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184 break;
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185 default:
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186 LOGP(DMAIN, LOGL_DEBUG, "Unhandled GSUP message type %s\n",
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187 osmo_gsup_message_type_name(gsup_msg.message_type));
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188 break;
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189 }
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190
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191 msgb_free(msg);
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192 return 0;
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193 }
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194
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195
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196 static struct log_info_cat default_categories[] = {
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197 [DMAIN] = {
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198 .name = "DMAIN",
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199 .description = "Main Program",
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200 .enabled = 1, .loglevel = LOGL_DEBUG,
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201 },
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202 };
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203
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204 static const struct log_info gsup_log_info = {
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205 .cat = default_categories,
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206 .num_cat = ARRAY_SIZE(default_categories),
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207 };
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208
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209 static void print_usage(void)
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210 {
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211 printf("Usage: osmo-euse-demo [hlr-ip [hlr-gsup-port]]\n");
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212 }
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213
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214 int main(int argc, char **argv)
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215 {
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216 char *server_host = "127.0.0.1";
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217 uint16_t server_port = OSMO_GSUP_PORT;
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218 void *ctx = talloc_named_const(NULL, 0, "demo-euse");
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219
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220 osmo_init_logging2(ctx, &gsup_log_info);
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221
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222 if (argc > 1) {
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223 if (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h")) {
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224 print_usage();
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225 exit(0);
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226 } else
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227 server_host = argv[1];
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228 }
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229 if (argc > 2)
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230 server_port = atoi(argv[2]);
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231
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232 g_gc = osmo_gsup_client_create(ctx, "EUSE-foobar", server_host, server_port, gsupc_read_cb, NULL);
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233
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234 while (1) {
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235 osmo_select_main(0);
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236 }
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237
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238 exit(0);
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239 }
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240