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annotate librtpalloc/rtp_alloc_simple.c @ 184:f8c40090a0a8

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librtpalloc: new library for talking to themwi-rtp-mgr
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Mar 2023 23:48:14 -0800
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184
f8c40090a0a8 librtpalloc: new library for talking to themwi-rtp-mgr
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * The library function implemented in this C module provides a
f8c40090a0a8 librtpalloc: new library for talking to themwi-rtp-mgr
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3 * simple interface for obtaining a single RTP endpoint from
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4 * themwi-rtp-mgr.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/socket.h>
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9 #include <sys/un.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include "../include/tmgw_const.h"
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16 #include "../include/rtp_alloc.h"
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17 #include "rtpmgr_resp.h"
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18 #include "rtp_alloc_simple.h"
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19
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20 static char ctrl_socket_pathname[] = "/var/gsm/rtp_alloc_socket";
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21
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22 static void
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23 close_fds(resp)
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24 struct rtp_alloc_resp_wrap *resp;
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25 {
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26 unsigned n;
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27
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28 for (n = 0; n < resp->num_fd; n++)
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29 close(resp->fd_buf[n]);
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30 }
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31
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32 rtp_alloc_simple(ep_type, out)
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33 int ep_type;
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34 struct rtp_alloc_simple *out;
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35 {
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36 struct sockaddr_un sa;
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37 unsigned sa_len;
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38 int ctrl_fd, rc;
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39 struct rtp_alloc_req req;
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40 struct rtp_alloc_resp_wrap resp;
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41 unsigned expect_num_fd;
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42
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43 switch (ep_type) {
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44 case TMGW_EP_TYPE_GSM_ONLY:
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45 case TMGW_EP_TYPE_PSTN_ONLY:
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46 expect_num_fd = 2;
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47 break;
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48 case TMGW_EP_TYPE_GATEWAY:
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49 expect_num_fd = 4;
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50 break;
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51 default:
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52 fprintf(stderr,
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53 "rtp_alloc_simple() error: unknown EP type %d\n",
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54 ep_type);
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55 return(-1);
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56 }
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57 ctrl_fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
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58 if (ctrl_fd < 0) {
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59 perror("socket(AF_UNIX, SOCK_SEQPACKET, 0)");
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60 return(-1);
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61 }
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62 fill_sockaddr_un(ctrl_socket_pathname, &sa, &sa_len);
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63 rc = connect(ctrl_fd, (struct sockaddr *) &sa, sa_len);
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64 if (rc < 0) {
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65 perror(ctrl_socket_pathname);
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66 close(ctrl_fd);
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67 return(-1);
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68 }
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69 bzero(&req, sizeof req);
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70 req.ep_type = ep_type;
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71 rc = send(ctrl_fd, &req, sizeof req, 0);
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72 if (rc < 0) {
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73 perror("send to RTP allocator socket");
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74 close(ctrl_fd);
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75 return(-1);
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76 }
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77 rc = collect_rtpmgr_resp(ctrl_fd, 0, &resp);
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78 if (rc < 0) {
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79 perror("recvmsg from RTP allocator socket");
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80 close(ctrl_fd);
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81 return(-1);
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82 }
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83 close(ctrl_fd);
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84 if (resp.resp_len != sizeof(struct rtp_alloc_resp)) {
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85 fprintf(stderr,
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86 "error: response packet from themwi-rtp-mgr has wrong length (%u bytes)\n",
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87 resp.resp_len);
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88 close_fds(&resp);
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89 return(-1);
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90 }
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91 if (resp.resp.res != RTP_ALLOC_OK) {
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92 fprintf(stderr, "themwi-rtp-mgr returned error %u\n",
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93 resp.resp.res);
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94 close_fds(&resp);
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95 return(-1);
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96 }
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97 if (resp.num_fd != expect_num_fd) {
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98 fprintf(stderr,
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99 "error: themwi-rtp-mgr returned %u descriptors instead of expected %u\n",
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100 resp.num_fd, expect_num_fd);
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101 close_fds(&resp);
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102 return(-1);
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103 }
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104 switch (ep_type) {
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105 case TMGW_EP_TYPE_GSM_ONLY:
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106 out->gsm_rtp_fd = resp.fd_buf[0];
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107 out->gsm_rtcp_fd = resp.fd_buf[1];
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108 break;
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109 case TMGW_EP_TYPE_PSTN_ONLY:
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110 out->pstn_rtp_fd = resp.fd_buf[0];
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111 out->pstn_rtcp_fd = resp.fd_buf[1];
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112 break;
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113 case TMGW_EP_TYPE_GATEWAY:
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114 out->gsm_rtp_fd = resp.fd_buf[0];
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115 out->gsm_rtcp_fd = resp.fd_buf[1];
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116 out->pstn_rtp_fd = resp.fd_buf[2];
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117 out->pstn_rtcp_fd = resp.fd_buf[3];
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118 }
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119 bcopy(&resp.resp.gsm_addr, &out->gsm_addr,
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120 sizeof(struct sockaddr_storage));
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121 bcopy(&resp.resp.pstn_addr, &out->pstn_addr,
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122 sizeof(struct sockaddr_storage));
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123 return(0);
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124 }