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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_channel.h>
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10
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11
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12 ngx_int_t ngx_write_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
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13 ngx_log_t *log)
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14 {
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15 ssize_t n;
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16 ngx_err_t err;
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17 struct iovec iov[1];
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18 struct msghdr msg;
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19
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18
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20 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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21
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22 union {
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23 struct cmsghdr cm;
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24 char space[CMSG_SPACE(sizeof(int))];
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25 } cmsg;
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26
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27 if (ch->fd == -1) {
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28 msg.msg_control = NULL;
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29 msg.msg_controllen = 0;
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30
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31 } else {
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32 msg.msg_control = (caddr_t) &cmsg;
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33 msg.msg_controllen = sizeof(cmsg);
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34
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35 cmsg.cm.cmsg_len = sizeof(cmsg);
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36 cmsg.cm.cmsg_level = SOL_SOCKET;
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37 cmsg.cm.cmsg_type = SCM_RIGHTS;
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38 *(int *) CMSG_DATA(&cmsg.cm) = ch->fd;
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39 }
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40
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41 #else
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42
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43 if (ch->fd == -1) {
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44 msg.msg_accrights = NULL;
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45 msg.msg_accrightslen = 0;
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46
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47 } else {
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48 msg.msg_accrights = (caddr_t) &ch->fd;
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49 msg.msg_accrightslen = sizeof(int);
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50 }
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51
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52 #endif
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53
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54 iov[0].iov_base = (char *) ch;
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55 iov[0].iov_len = size;
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56
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57 msg.msg_name = NULL;
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58 msg.msg_namelen = 0;
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59 msg.msg_iov = iov;
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60 msg.msg_iovlen = 1;
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61
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62 n = sendmsg(s, &msg, 0);
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63
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64 if (n == -1) {
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65 err = ngx_errno;
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66 if (err == NGX_EAGAIN) {
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67 return NGX_AGAIN;
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68 }
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69
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70 ngx_log_error(NGX_LOG_ALERT, log, err, "sendmsg() failed");
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71 return NGX_ERROR;
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72 }
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73
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74 return NGX_OK;
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75 }
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76
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77
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78 ngx_int_t ngx_read_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
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79 ngx_log_t *log)
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80 {
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81 ssize_t n;
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82 ngx_err_t err;
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83 struct iovec iov[1];
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84 struct msghdr msg;
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85
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18
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86 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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87 union {
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88 struct cmsghdr cm;
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89 char space[CMSG_SPACE(sizeof(int))];
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90 } cmsg;
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91 #else
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92 int fd;
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93 #endif
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94
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95 iov[0].iov_base = (char *) ch;
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96 iov[0].iov_len = size;
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97
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98 msg.msg_name = NULL;
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99 msg.msg_namelen = 0;
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100 msg.msg_iov = iov;
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101 msg.msg_iovlen = 1;
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102
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18
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103 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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104 msg.msg_control = (caddr_t) &cmsg;
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105 msg.msg_controllen = sizeof(cmsg);
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106 #else
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107 msg.msg_accrights = (caddr_t) &fd;
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108 msg.msg_accrightslen = sizeof(int);
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109 #endif
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110
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111 n = recvmsg(s, &msg, 0);
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112
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113 if (n == -1) {
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114 err = ngx_errno;
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115 if (err == NGX_EAGAIN) {
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116 return NGX_AGAIN;
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117 }
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118
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119 ngx_log_error(NGX_LOG_ALERT, log, err, "recvmsg() failed");
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120 return NGX_ERROR;
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121 }
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122
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10
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123 if (n == 0) {
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124 ngx_log_debug0(NGX_LOG_DEBUG_CORE, log, 0, "recvmsg() returned zero");
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125 return NGX_ERROR;
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126 }
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127
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0
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128 if ((size_t) n < sizeof(ngx_channel_t)) {
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129 ngx_log_error(NGX_LOG_ALERT, log, 0,
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10
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130 "recvmsg() returned not enough data: %uz", n);
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0
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131 return NGX_ERROR;
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132 }
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133
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18
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134 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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135
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136 if (ch->command == NGX_CMD_OPEN_CHANNEL) {
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137
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138 if (cmsg.cm.cmsg_len < sizeof(cmsg)) {
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139 ngx_log_error(NGX_LOG_ALERT, log, 0,
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140 "recvmsg() returned too small ancillary data");
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141 return NGX_ERROR;
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142 }
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143
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144 if (cmsg.cm.cmsg_level != SOL_SOCKET || cmsg.cm.cmsg_type != SCM_RIGHTS)
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145 {
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146 ngx_log_error(NGX_LOG_ALERT, log, 0,
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147 "recvmsg() returned invalid ancillary data "
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148 "level %d or type %d",
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149 cmsg.cm.cmsg_level, cmsg.cm.cmsg_type);
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150 return NGX_ERROR;
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151 }
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152
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153 ch->fd = *(int *) CMSG_DATA(&cmsg.cm);
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154 }
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155
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156 if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
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157 ngx_log_error(NGX_LOG_ALERT, log, 0,
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158 "recvmsg() truncated data");
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159 }
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160
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161 #else
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162
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163 if (ch->command == NGX_CMD_OPEN_CHANNEL) {
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164 if (msg.msg_accrightslen != sizeof(int)) {
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165 ngx_log_error(NGX_LOG_ALERT, log, 0,
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166 "recvmsg() returned no ancillary data");
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167 return NGX_ERROR;
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168 }
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169
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170 ch->fd = fd;
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171 }
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172
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173 #endif
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174
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175 return n;
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176 }
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177
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178
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179 ngx_int_t ngx_add_channel_event(ngx_cycle_t *cycle, ngx_fd_t fd,
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180 ngx_int_t event, ngx_event_handler_pt handler)
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181 {
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182 ngx_event_t *ev, *rev, *wev;
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183 ngx_connection_t *c;
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184
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185 c = &cycle->connections[fd];
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186 rev = &cycle->read_events[fd];
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187 wev = &cycle->write_events[fd];
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188
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189 ngx_memzero(c, sizeof(ngx_connection_t));
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190 ngx_memzero(rev, sizeof(ngx_event_t));
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191 ngx_memzero(wev, sizeof(ngx_event_t));
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192
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193 c->fd = fd;
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194 c->pool = cycle->pool;
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195
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196 c->read = rev;
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197 c->write = wev;
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198
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199 c->log = cycle->log;
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200 rev->log = cycle->log;
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201 wev->log = cycle->log;
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202 rev->index = NGX_INVALID_INDEX;
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203 wev->index = NGX_INVALID_INDEX;
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204 rev->data = c;
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205 wev->data = c;
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206
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207 #if (NGX_THREADS)
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208 rev->lock = &c->lock;
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209 wev->lock = &c->lock;
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210 rev->own_lock = &c->lock;
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211 wev->own_lock = &c->lock;
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212 #endif
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213
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214 ev = (event == NGX_READ_EVENT) ? rev : wev;
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215
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216 ev->event_handler = handler;
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217
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218 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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219 if (ngx_add_conn(c) == NGX_ERROR) {
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220 return NGX_ERROR;
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221 }
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222
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223 } else {
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224 if (ngx_add_event(ev, event, 0) == NGX_ERROR) {
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225 return NGX_ERROR;
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226 }
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227 }
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228
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229 return NGX_OK;
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230 }
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231
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232
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233 void ngx_close_channel(ngx_fd_t *fd, ngx_log_t *log)
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234 {
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235 if (close(fd[0]) == -1) {
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236 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
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0
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237 }
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238
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239 if (close(fd[1]) == -1) {
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14
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240 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
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0
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241 }
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242 }
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