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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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92
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12 ngx_int_t
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13 ngx_write_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
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126
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14 ngx_log_t *log)
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0
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15 {
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16 ssize_t n;
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17 ngx_err_t err;
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18 struct iovec iov[1];
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19 struct msghdr msg;
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20
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18
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21 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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22
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23 union {
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24 struct cmsghdr cm;
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25 char space[CMSG_SPACE(sizeof(int))];
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26 } cmsg;
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27
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28 if (ch->fd == -1) {
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29 msg.msg_control = NULL;
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30 msg.msg_controllen = 0;
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31
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32 } else {
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33 msg.msg_control = (caddr_t) &cmsg;
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34 msg.msg_controllen = sizeof(cmsg);
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35
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366
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36 cmsg.cm.cmsg_len = CMSG_LEN(sizeof(int));
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126
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37 cmsg.cm.cmsg_level = SOL_SOCKET;
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0
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38 cmsg.cm.cmsg_type = SCM_RIGHTS;
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39 *(int *) CMSG_DATA(&cmsg.cm) = ch->fd;
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40 }
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41
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32
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42 msg.msg_flags = 0;
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43
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0
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44 #else
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45
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46 if (ch->fd == -1) {
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47 msg.msg_accrights = NULL;
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48 msg.msg_accrightslen = 0;
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49
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50 } else {
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51 msg.msg_accrights = (caddr_t) &ch->fd;
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52 msg.msg_accrightslen = sizeof(int);
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53 }
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54
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55 #endif
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56
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57 iov[0].iov_base = (char *) ch;
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58 iov[0].iov_len = size;
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59
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60 msg.msg_name = NULL;
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61 msg.msg_namelen = 0;
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62 msg.msg_iov = iov;
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63 msg.msg_iovlen = 1;
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64
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65 n = sendmsg(s, &msg, 0);
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66
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67 if (n == -1) {
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68 err = ngx_errno;
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69 if (err == NGX_EAGAIN) {
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70 return NGX_AGAIN;
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71 }
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72
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73 ngx_log_error(NGX_LOG_ALERT, log, err, "sendmsg() failed");
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74 return NGX_ERROR;
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75 }
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76
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77 return NGX_OK;
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78 }
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79
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80
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92
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81 ngx_int_t
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82 ngx_read_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size, ngx_log_t *log)
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126
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83 {
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0
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84 ssize_t n;
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85 ngx_err_t err;
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86 struct iovec iov[1];
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87 struct msghdr msg;
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88
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18
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89 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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90 union {
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91 struct cmsghdr cm;
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92 char space[CMSG_SPACE(sizeof(int))];
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93 } cmsg;
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94 #else
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95 int fd;
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96 #endif
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97
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98 iov[0].iov_base = (char *) ch;
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99 iov[0].iov_len = size;
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100
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101 msg.msg_name = NULL;
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102 msg.msg_namelen = 0;
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103 msg.msg_iov = iov;
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104 msg.msg_iovlen = 1;
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105
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18
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106 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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107 msg.msg_control = (caddr_t) &cmsg;
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108 msg.msg_controllen = sizeof(cmsg);
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109 #else
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110 msg.msg_accrights = (caddr_t) &fd;
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111 msg.msg_accrightslen = sizeof(int);
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112 #endif
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113
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114 n = recvmsg(s, &msg, 0);
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115
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116 if (n == -1) {
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117 err = ngx_errno;
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118 if (err == NGX_EAGAIN) {
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119 return NGX_AGAIN;
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120 }
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121
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122 ngx_log_error(NGX_LOG_ALERT, log, err, "recvmsg() failed");
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123 return NGX_ERROR;
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124 }
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125
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10
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126 if (n == 0) {
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127 ngx_log_debug0(NGX_LOG_DEBUG_CORE, log, 0, "recvmsg() returned zero");
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128 return NGX_ERROR;
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129 }
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130
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0
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131 if ((size_t) n < sizeof(ngx_channel_t)) {
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132 ngx_log_error(NGX_LOG_ALERT, log, 0,
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10
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133 "recvmsg() returned not enough data: %uz", n);
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0
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134 return NGX_ERROR;
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135 }
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136
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18
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137 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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138
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139 if (ch->command == NGX_CMD_OPEN_CHANNEL) {
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140
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366
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141 if (cmsg.cm.cmsg_len < (socklen_t) CMSG_LEN(sizeof(int))) {
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0
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142 ngx_log_error(NGX_LOG_ALERT, log, 0,
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143 "recvmsg() returned too small ancillary data");
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144 return NGX_ERROR;
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145 }
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146
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147 if (cmsg.cm.cmsg_level != SOL_SOCKET || cmsg.cm.cmsg_type != SCM_RIGHTS)
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148 {
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149 ngx_log_error(NGX_LOG_ALERT, log, 0,
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150 "recvmsg() returned invalid ancillary data "
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151 "level %d or type %d",
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152 cmsg.cm.cmsg_level, cmsg.cm.cmsg_type);
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153 return NGX_ERROR;
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154 }
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155
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156 ch->fd = *(int *) CMSG_DATA(&cmsg.cm);
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157 }
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158
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159 if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
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160 ngx_log_error(NGX_LOG_ALERT, log, 0,
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161 "recvmsg() truncated data");
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162 }
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163
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164 #else
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165
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166 if (ch->command == NGX_CMD_OPEN_CHANNEL) {
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167 if (msg.msg_accrightslen != sizeof(int)) {
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126
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168 ngx_log_error(NGX_LOG_ALERT, log, 0,
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0
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169 "recvmsg() returned no ancillary data");
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170 return NGX_ERROR;
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171 }
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172
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173 ch->fd = fd;
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174 }
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175
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176 #endif
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177
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178 return n;
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179 }
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180
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181
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92
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182 ngx_int_t
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183 ngx_add_channel_event(ngx_cycle_t *cycle, ngx_fd_t fd, ngx_int_t event,
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184 ngx_event_handler_pt handler)
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0
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185 {
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186 ngx_event_t *ev, *rev, *wev;
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187 ngx_connection_t *c;
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188
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92
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189 c = ngx_get_connection(fd, cycle->log);
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190
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191 if (c == NULL) {
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192 return NGX_ERROR;
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193 }
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194
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110
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195 c->pool = cycle->pool;
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196
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92
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197 rev = c->read;
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198 wev = c->write;
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0
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199
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200 rev->log = cycle->log;
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201 wev->log = cycle->log;
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92
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202
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0
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203 #if (NGX_THREADS)
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204 rev->lock = &c->lock;
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205 wev->lock = &c->lock;
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206 rev->own_lock = &c->lock;
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207 wev->own_lock = &c->lock;
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208 #endif
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209
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112
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210 rev->channel = 1;
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211 wev->channel = 1;
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212
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0
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213 ev = (event == NGX_READ_EVENT) ? rev : wev;
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214
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58
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215 ev->handler = handler;
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0
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216
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217 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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218 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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219 ngx_free_connection(c);
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0
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220 return NGX_ERROR;
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221 }
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126
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222
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223 } else {
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0
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224 if (ngx_add_event(ev, event, 0) == NGX_ERROR) {
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92
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225 ngx_free_connection(c);
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0
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226 return NGX_ERROR;
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227 }
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228 }
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229
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230 return NGX_OK;
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231 }
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232
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233
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92
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234 void
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235 ngx_close_channel(ngx_fd_t *fd, ngx_log_t *log)
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0
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236 {
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237 if (close(fd[0]) == -1) {
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14
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238 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
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0
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239 }
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240
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241 if (close(fd[1]) == -1) {
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14
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242 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
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0
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243 }
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244 }
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