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annotate rtp-mgr/ctrl_prot.c @ 179:b79d6334f543

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themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Mar 2023 20:19:14 -0800
parents mgw/ctrl_prot.c@f062c32a5116
children 565477d07418
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rev   line source
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1 /*
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2 * In this module we implement our control socket protocol.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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7 #include <sys/uio.h>
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8 #include <netinet/in.h>
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9 #include <stdio.h>
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020ba624bdd8 mgw source: #include <stdlib.h> in files using tmgw_ctrl.h
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10 #include <stdint.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 <syslog.h>
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15 #include <unistd.h>
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16 #include "../include/tmgw_const.h"
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17 #include "../include/rtp_alloc.h"
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18 #include "struct.h"
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19 #include "select.h"
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20
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21 extern struct bind_range_cfg bind_range_gsm, bind_range_pstn;
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22
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23 void
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24 free_rtp_end(roe)
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25 struct rtp_one_end *roe;
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26 {
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27 close(roe->rtp_fd);
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28 close(roe->rtcp_fd);
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29 }
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30
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31 void
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32 ctrl_message_handler(fd)
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33 {
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34 struct rtp_alloc_req req;
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35 struct rtp_alloc_resp resp;
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36 struct rtp_one_end rtp_gsm, rtp_pstn;
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37 struct iovec iov;
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38 struct msghdr msg;
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39 int fd_out[4], num_fd, *fd_bufptr;
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40 union {
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41 char buf[CMSG_SPACE(sizeof fd_out)];
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42 struct cmsghdr align;
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43 } cmsgu;
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44 struct cmsghdr *cmsg;
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45 int rc;
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46
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47 /* receive request */
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48 rc = recv(fd, &req, sizeof req, 0);
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49 if (rc < sizeof req) {
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50 syslog(LOG_DEBUG, "ctrl connection closing");
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51 close(fd);
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52 FD_CLR(fd, &select_for_read);
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53 return;
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54 }
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55 /* start preparing response */
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56 bzero(&resp, sizeof resp);
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57 resp.transact_ref = req.transact_ref;
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58 switch (req.ep_type) {
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59 case TMGW_EP_TYPE_DUMMY_GSM:
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60 case TMGW_EP_TYPE_DUMMY_PSTN:
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61 case TMGW_EP_TYPE_GATEWAY:
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62 break;
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63 default:
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64 resp.res = RTP_ALLOC_ERR_PARAM;
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65 error_resp: send(fd, &resp, sizeof resp, 0);
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66 return;
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67 }
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68 /* allocate resources */
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69 if (req.ep_type & TMGW_EP_HAS_GSM_SOCK) {
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70 rc = get_rtp_port_pair(&rtp_gsm, &bind_range_gsm);
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71 if (rc < 0) {
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72 syslog(LOG_ERR,
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73 "unable to get local port pair on GSM side");
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74 resp.res = RTP_ALLOC_ERR_RSRC;
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75 goto error_resp;
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76 }
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77 }
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78 if (req.ep_type & TMGW_EP_HAS_PSTN_SOCK) {
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79 rc = get_rtp_port_pair(&rtp_pstn, &bind_range_pstn);
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80 if (rc < 0) {
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81 syslog(LOG_ERR,
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82 "unable to get local port pair on PSTN side");
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83 if (req.ep_type & TMGW_EP_HAS_GSM_SOCK)
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84 free_rtp_end(&rtp_gsm);
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85 resp.res = RTP_ALLOC_ERR_RSRC;
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86 goto error_resp;
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87 }
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88 }
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89 /* finish ordinary body of response */
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90 resp.res = RTP_ALLOC_OK;
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91 if (req.ep_type & TMGW_EP_HAS_GSM_SOCK)
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92 bcopy(&rtp_gsm.bound_addr, &resp.gsm_addr,
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93 sizeof(struct sockaddr_in));
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94 if (req.ep_type & TMGW_EP_HAS_PSTN_SOCK)
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95 bcopy(&rtp_pstn.bound_addr, &resp.pstn_addr,
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96 sizeof(struct sockaddr_in));
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97 iov.iov_base = &resp;
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98 iov.iov_len = sizeof resp;
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99 /* file descriptor passing voodoo */
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100 switch (req.ep_type) {
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101 case TMGW_EP_TYPE_DUMMY_GSM:
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102 num_fd = 2;
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103 fd_out[0] = rtp_gsm.rtp_fd;
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104 fd_out[1] = rtp_gsm.rtcp_fd;
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105 break;
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106 case TMGW_EP_TYPE_DUMMY_PSTN:
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107 num_fd = 2;
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108 fd_out[0] = rtp_pstn.rtp_fd;
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109 fd_out[1] = rtp_pstn.rtcp_fd;
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110 break;
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111 case TMGW_EP_TYPE_GATEWAY:
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112 num_fd = 4;
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113 fd_out[0] = rtp_gsm.rtp_fd;
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114 fd_out[1] = rtp_gsm.rtcp_fd;
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115 fd_out[2] = rtp_pstn.rtp_fd;
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116 fd_out[3] = rtp_pstn.rtcp_fd;
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117 }
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Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
118 bzero(&msg, sizeof msg);
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Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
119 msg.msg_iov = &iov;
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Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
120 msg.msg_iovlen = 1;
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
121 msg.msg_control = cmsgu.buf;
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Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
122 msg.msg_controllen = CMSG_SPACE(sizeof(int) * num_fd);
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
123 cmsg = CMSG_FIRSTHDR(&msg);
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
124 cmsg->cmsg_level = SOL_SOCKET;
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
125 cmsg->cmsg_type = SCM_RIGHTS;
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
126 cmsg->cmsg_len = CMSG_LEN(sizeof(int) * num_fd);
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
127 fd_bufptr = (int *) CMSG_DATA(cmsg);
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
128 bcopy(fd_out, fd_bufptr, sizeof(int) * num_fd);
b79d6334f543 themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
129 sendmsg(fd, &msg, 0);
32
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 }