FreeCalypso > hg > themwi-rtp-mgr

annotate librtpalloc/simple_client.c @ 6:191d58f5c24f

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librtpalloc: port the simple client
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 May 2024 21:10:01 +0000
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6
191d58f5c24f librtpalloc: port the simple client
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
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3 * simple interface for obtaining a single RTP endpoint from
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4 * themwi-rtp-mgr. This "simple client" option is suitable only
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5 * for command line utilities, not for daemon processes!
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6 */
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7
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8 #include <sys/types.h>
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9 #include <sys/socket.h>
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10 #include <sys/un.h>
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11 #include <stdio.h>
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12 #include <stdint.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <strings.h>
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16
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17 #include <themwi/rtp/rtp_alloc_if.h>
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18 #include <themwi/rtp/rtp_alloc_resp.h>
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19 #include <themwi/rtp/rtp_alloc_simple.h>
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20
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21 static const char ctrl_socket_pathname[] = "/var/gsm/rtp_alloc_socket";
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22
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23 static void
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24 fill_sockaddr_un(pathname, sunp, lenp)
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25 char *pathname;
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26 struct sockaddr_un *sunp;
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27 unsigned *lenp;
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28 {
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29 /* local socket binding voodoo copied from osmocon */
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30 sunp->sun_family = AF_UNIX;
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31 strncpy(sunp->sun_path, pathname, sizeof(sunp->sun_path));
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32 sunp->sun_path[sizeof(sunp->sun_path) - 1] = '\0';
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33 /* we use the same magic that X11 uses in Xtranssock.c for
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34 * calculating the proper length of the sockaddr */
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35 #if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
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36 sunp->sun_len = strlen(sunp->sun_path);
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37 #endif
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38 #if defined(BSD44SOCKETS) || defined(SUN_LEN)
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39 *lenp = SUN_LEN(sunp);
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40 #else
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41 *lenp = strlen(sunp->sun_path) +
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42 offsetof(struct sockaddr_un, sun_path) + 1;
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43 #endif
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44 }
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45
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46 static void
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47 close_fds(resp)
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48 struct rtp_alloc_resp_wrap *resp;
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49 {
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50 unsigned n;
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51
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52 for (n = 0; n < resp->num_fd; n++)
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53 close(resp->fd_buf[n]);
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54 }
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55
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56 int rtp_alloc_simple(int ep_type, struct rtp_alloc_simple *out)
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57 {
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58 struct sockaddr_un sa;
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59 unsigned sa_len;
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60 int ctrl_fd, rc;
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61 struct rtp_alloc_req req;
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62 struct rtp_alloc_resp_wrap resp;
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63 unsigned expect_num_fd;
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64
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65 switch (ep_type) {
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66 case RTP_ALLOC_TYPE_GSM:
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67 case RTP_ALLOC_TYPE_PSTN:
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68 expect_num_fd = 2;
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69 break;
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70 case RTP_ALLOC_TYPE_GSM2PSTN:
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71 case RTP_ALLOC_TYPE_GSM2GSM:
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72 expect_num_fd = 4;
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73 break;
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74 default:
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75 fprintf(stderr,
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76 "rtp_alloc_simple() error: unknown EP type %d\n",
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77 ep_type);
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78 return(-1);
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79 }
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80 ctrl_fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
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81 if (ctrl_fd < 0) {
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82 perror("socket(AF_UNIX, SOCK_SEQPACKET, 0)");
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83 return(-1);
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84 }
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85 fill_sockaddr_un(ctrl_socket_pathname, &sa, &sa_len);
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86 rc = connect(ctrl_fd, (struct sockaddr *) &sa, sa_len);
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87 if (rc < 0) {
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88 perror(ctrl_socket_pathname);
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89 close(ctrl_fd);
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90 return(-1);
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91 }
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92 bzero(&req, sizeof req);
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93 req.ep_type = ep_type;
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94 rc = send(ctrl_fd, &req, sizeof req, 0);
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95 if (rc < 0) {
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96 perror("send to RTP allocator socket");
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97 close(ctrl_fd);
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98 return(-1);
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99 }
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100 rc = collect_rtpmgr_resp(ctrl_fd, 0, &resp);
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101 if (rc < 0) {
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102 perror("recvmsg from RTP allocator socket");
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103 close(ctrl_fd);
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104 return(-1);
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105 }
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106 close(ctrl_fd);
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107 if (resp.resp_len != sizeof(struct rtp_alloc_resp)) {
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108 fprintf(stderr,
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109 "error: response packet from themwi-rtp-mgr has wrong length (%u bytes)\n",
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110 resp.resp_len);
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111 close_fds(&resp);
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112 return(-1);
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113 }
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114 if (resp.resp.res != RTP_ALLOC_OK) {
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115 fprintf(stderr, "themwi-rtp-mgr returned error %u\n",
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116 resp.resp.res);
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117 close_fds(&resp);
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118 return(-1);
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119 }
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120 if (resp.num_fd != expect_num_fd) {
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121 fprintf(stderr,
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122 "error: themwi-rtp-mgr returned %u descriptors instead of expected %u\n",
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123 resp.num_fd, expect_num_fd);
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124 close_fds(&resp);
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125 return(-1);
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126 }
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127 switch (ep_type) {
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128 case RTP_ALLOC_TYPE_GSM:
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129 out->gsm_rtp_fd = resp.fd_buf[0];
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130 out->gsm_rtcp_fd = resp.fd_buf[1];
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131 break;
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132 case RTP_ALLOC_TYPE_PSTN:
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133 out->pstn_rtp_fd = resp.fd_buf[0];
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134 out->pstn_rtcp_fd = resp.fd_buf[1];
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135 break;
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136 case RTP_ALLOC_TYPE_GSM2PSTN:
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137 case RTP_ALLOC_TYPE_GSM2GSM:
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138 out->gsm_rtp_fd = resp.fd_buf[0];
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139 out->gsm_rtcp_fd = resp.fd_buf[1];
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140 out->pstn_rtp_fd = resp.fd_buf[2];
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141 out->pstn_rtcp_fd = resp.fd_buf[3];
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142 }
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143 bcopy(&resp.resp.gsm_addr, &out->gsm_addr,
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144 sizeof(struct sockaddr_storage));
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145 bcopy(&resp.resp.pstn_addr, &out->pstn_addr,
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146 sizeof(struct sockaddr_storage));
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147 return(0);
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148 }