annotate rtp-mgr/ctrl_prot.c @ 2:247f4bbde24c

rtp-mgr: daemon ported over
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 May 2024 19:42:19 +0000
parents
children
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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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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 <themwi/rtp/rtp_alloc_if.h>
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17 #include "struct.h"
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18 #include "select.h"
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19
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20 extern struct bind_range_cfg bind_range_gsm, bind_range_pstn;
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21
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22 static void
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23 free_rtp_end(roe)
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24 struct rtp_one_end *roe;
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25 {
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26 close(roe->rtp_fd);
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27 close(roe->rtcp_fd);
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28 }
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29
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30 static void
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31 close_fds(fd_list, num_fd)
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32 int *fd_list, num_fd;
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33 {
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34 int i;
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35
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36 for (i = 0; i < num_fd; i++)
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37 close(fd_list[i]);
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38 }
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39
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40 void
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41 ctrl_message_handler(fd)
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42 {
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43 struct rtp_alloc_req req;
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44 struct rtp_alloc_resp resp;
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45 struct rtp_one_end rtp_gsm, rtp_pstn;
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46 struct iovec iov;
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47 struct msghdr msg;
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48 int fd_out[4], num_fd, *fd_bufptr;
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49 union {
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50 char buf[CMSG_SPACE(sizeof fd_out)];
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51 struct cmsghdr align;
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52 } cmsgu;
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53 struct cmsghdr *cmsg;
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54 int rc;
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55
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56 /* receive request */
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57 rc = recv(fd, &req, sizeof req, 0);
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58 if (rc < sizeof req) {
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59 syslog(LOG_DEBUG, "ctrl connection closing");
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60 close(fd);
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61 FD_CLR(fd, &select_for_read);
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62 return;
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63 }
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64 /* start preparing response */
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65 bzero(&resp, sizeof resp);
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66 resp.transact_ref = req.transact_ref;
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67 switch (req.ep_type) {
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68 case RTP_ALLOC_TYPE_GSM:
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69 case RTP_ALLOC_TYPE_PSTN:
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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 break;
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73 default:
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74 resp.res = RTP_ALLOC_ERR_PARAM;
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75 error_resp: send(fd, &resp, sizeof resp, 0);
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76 return;
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77 }
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78 /* allocate resources */
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79 if (req.ep_type & RTP_ALLOC_DO_GSM1) {
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80 rc = get_rtp_port_pair(&rtp_gsm, &bind_range_gsm);
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81 if (rc < 0) {
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82 syslog(LOG_ERR,
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83 "unable to get local port pair on GSM side");
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84 resp.res = RTP_ALLOC_ERR_RSRC;
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85 goto error_resp;
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86 }
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87 }
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88 if (req.ep_type & RTP_ALLOC_DO_PSTN) {
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89 rc = get_rtp_port_pair(&rtp_pstn, &bind_range_pstn);
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90 if (rc < 0) {
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91 syslog(LOG_ERR,
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92 "unable to get local port pair on PSTN side");
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93 if (req.ep_type & RTP_ALLOC_DO_GSM1)
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94 free_rtp_end(&rtp_gsm);
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95 resp.res = RTP_ALLOC_ERR_RSRC;
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96 goto error_resp;
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97 }
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98 }
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99 if (req.ep_type & RTP_ALLOC_DO_GSM2) {
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100 rc = get_rtp_port_pair(&rtp_pstn, &bind_range_gsm);
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101 if (rc < 0) {
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102 syslog(LOG_ERR,
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103 "unable to get 2nd local port pair on GSM side");
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104 free_rtp_end(&rtp_gsm);
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105 resp.res = RTP_ALLOC_ERR_RSRC;
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106 goto error_resp;
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107 }
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108 }
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109 /* finish ordinary body of response */
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110 resp.res = RTP_ALLOC_OK;
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111 if (req.ep_type & RTP_ALLOC_DO_GSM1)
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112 bcopy(&rtp_gsm.bound_addr, &resp.gsm_addr,
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113 sizeof(struct sockaddr_in));
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114 if (req.ep_type & (RTP_ALLOC_DO_PSTN | RTP_ALLOC_DO_GSM2))
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115 bcopy(&rtp_pstn.bound_addr, &resp.pstn_addr,
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116 sizeof(struct sockaddr_in));
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117 iov.iov_base = &resp;
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118 iov.iov_len = sizeof resp;
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119 /* file descriptor passing voodoo */
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120 switch (req.ep_type) {
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121 case RTP_ALLOC_TYPE_GSM:
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122 num_fd = 2;
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123 fd_out[0] = rtp_gsm.rtp_fd;
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124 fd_out[1] = rtp_gsm.rtcp_fd;
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125 break;
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126 case RTP_ALLOC_TYPE_PSTN:
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127 num_fd = 2;
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128 fd_out[0] = rtp_pstn.rtp_fd;
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129 fd_out[1] = rtp_pstn.rtcp_fd;
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130 break;
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131 case RTP_ALLOC_TYPE_GSM2PSTN:
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132 case RTP_ALLOC_TYPE_GSM2GSM:
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133 num_fd = 4;
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134 fd_out[0] = rtp_gsm.rtp_fd;
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135 fd_out[1] = rtp_gsm.rtcp_fd;
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parents:
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136 fd_out[2] = rtp_pstn.rtp_fd;
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137 fd_out[3] = rtp_pstn.rtcp_fd;
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138 }
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139 bzero(&msg, sizeof msg);
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Mychaela Falconia <falcon@freecalypso.org>
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140 msg.msg_iov = &iov;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 msg.msg_iovlen = 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 msg.msg_control = cmsgu.buf;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 msg.msg_controllen = CMSG_SPACE(sizeof(int) * num_fd);
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parents:
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144 cmsg = CMSG_FIRSTHDR(&msg);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 cmsg->cmsg_level = SOL_SOCKET;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 cmsg->cmsg_type = SCM_RIGHTS;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 cmsg->cmsg_len = CMSG_LEN(sizeof(int) * num_fd);
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parents:
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148 fd_bufptr = (int *) CMSG_DATA(cmsg);
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parents:
diff changeset
149 bcopy(fd_out, fd_bufptr, sizeof(int) * num_fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 sendmsg(fd, &msg, 0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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151 close_fds(fd_out, num_fd);
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parents:
diff changeset
152 }