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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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558
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39
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40 /*
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41 * We have to use ngx_memcpy() instead of simple
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42 * *(int *) CMSG_DATA(&cmsg.cm) = ch->fd;
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43 * because some gcc 4.4 with -O2/3/s optimization issues the warning:
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44 * dereferencing type-punned pointer will break strict-aliasing rules
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45 *
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46 * Fortunately, gcc with -O1 compiles this ngx_memcpy()
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47 * in the same simple assigment as in the code above
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48 */
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49
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50 ngx_memcpy(CMSG_DATA(&cmsg.cm), &ch->fd, sizeof(int));
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0
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51 }
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52
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32
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53 msg.msg_flags = 0;
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54
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0
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55 #else
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56
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57 if (ch->fd == -1) {
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58 msg.msg_accrights = NULL;
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59 msg.msg_accrightslen = 0;
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60
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61 } else {
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62 msg.msg_accrights = (caddr_t) &ch->fd;
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63 msg.msg_accrightslen = sizeof(int);
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64 }
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65
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66 #endif
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67
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68 iov[0].iov_base = (char *) ch;
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69 iov[0].iov_len = size;
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70
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71 msg.msg_name = NULL;
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72 msg.msg_namelen = 0;
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73 msg.msg_iov = iov;
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74 msg.msg_iovlen = 1;
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75
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76 n = sendmsg(s, &msg, 0);
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77
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78 if (n == -1) {
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79 err = ngx_errno;
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80 if (err == NGX_EAGAIN) {
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81 return NGX_AGAIN;
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82 }
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83
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84 ngx_log_error(NGX_LOG_ALERT, log, err, "sendmsg() failed");
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85 return NGX_ERROR;
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86 }
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87
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88 return NGX_OK;
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89 }
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90
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91
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92
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92 ngx_int_t
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93 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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94 {
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0
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95 ssize_t n;
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96 ngx_err_t err;
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97 struct iovec iov[1];
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98 struct msghdr msg;
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99
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18
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100 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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101 union {
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102 struct cmsghdr cm;
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103 char space[CMSG_SPACE(sizeof(int))];
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104 } cmsg;
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105 #else
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106 int fd;
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107 #endif
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108
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109 iov[0].iov_base = (char *) ch;
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110 iov[0].iov_len = size;
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111
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112 msg.msg_name = NULL;
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113 msg.msg_namelen = 0;
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114 msg.msg_iov = iov;
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115 msg.msg_iovlen = 1;
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116
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18
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117 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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118 msg.msg_control = (caddr_t) &cmsg;
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119 msg.msg_controllen = sizeof(cmsg);
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120 #else
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121 msg.msg_accrights = (caddr_t) &fd;
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122 msg.msg_accrightslen = sizeof(int);
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123 #endif
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124
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125 n = recvmsg(s, &msg, 0);
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126
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127 if (n == -1) {
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128 err = ngx_errno;
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129 if (err == NGX_EAGAIN) {
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130 return NGX_AGAIN;
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131 }
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132
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133 ngx_log_error(NGX_LOG_ALERT, log, err, "recvmsg() failed");
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134 return NGX_ERROR;
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135 }
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136
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10
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137 if (n == 0) {
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138 ngx_log_debug0(NGX_LOG_DEBUG_CORE, log, 0, "recvmsg() returned zero");
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139 return NGX_ERROR;
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140 }
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141
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0
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142 if ((size_t) n < sizeof(ngx_channel_t)) {
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143 ngx_log_error(NGX_LOG_ALERT, log, 0,
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10
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144 "recvmsg() returned not enough data: %uz", n);
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0
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145 return NGX_ERROR;
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146 }
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147
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18
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148 #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
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0
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149
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150 if (ch->command == NGX_CMD_OPEN_CHANNEL) {
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151
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366
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152 if (cmsg.cm.cmsg_len < (socklen_t) CMSG_LEN(sizeof(int))) {
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0
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153 ngx_log_error(NGX_LOG_ALERT, log, 0,
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154 "recvmsg() returned too small ancillary data");
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155 return NGX_ERROR;
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156 }
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157
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158 if (cmsg.cm.cmsg_level != SOL_SOCKET || cmsg.cm.cmsg_type != SCM_RIGHTS)
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159 {
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160 ngx_log_error(NGX_LOG_ALERT, log, 0,
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161 "recvmsg() returned invalid ancillary data "
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162 "level %d or type %d",
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163 cmsg.cm.cmsg_level, cmsg.cm.cmsg_type);
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164 return NGX_ERROR;
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165 }
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166
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558
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167 /* ch->fd = *(int *) CMSG_DATA(&cmsg.cm); */
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168
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169 ngx_memcpy(&ch->fd, CMSG_DATA(&cmsg.cm), sizeof(int));
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0
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170 }
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171
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172 if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
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173 ngx_log_error(NGX_LOG_ALERT, log, 0,
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174 "recvmsg() truncated data");
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175 }
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176
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177 #else
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178
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179 if (ch->command == NGX_CMD_OPEN_CHANNEL) {
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180 if (msg.msg_accrightslen != sizeof(int)) {
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126
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181 ngx_log_error(NGX_LOG_ALERT, log, 0,
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0
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182 "recvmsg() returned no ancillary data");
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183 return NGX_ERROR;
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184 }
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185
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186 ch->fd = fd;
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187 }
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188
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189 #endif
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190
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191 return n;
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192 }
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193
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194
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92
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195 ngx_int_t
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196 ngx_add_channel_event(ngx_cycle_t *cycle, ngx_fd_t fd, ngx_int_t event,
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197 ngx_event_handler_pt handler)
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0
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198 {
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199 ngx_event_t *ev, *rev, *wev;
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200 ngx_connection_t *c;
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201
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92
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202 c = ngx_get_connection(fd, cycle->log);
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203
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204 if (c == NULL) {
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205 return NGX_ERROR;
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206 }
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207
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110
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208 c->pool = cycle->pool;
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209
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92
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210 rev = c->read;
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211 wev = c->write;
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0
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212
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213 rev->log = cycle->log;
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214 wev->log = cycle->log;
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92
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215
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0
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216 #if (NGX_THREADS)
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217 rev->lock = &c->lock;
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218 wev->lock = &c->lock;
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219 rev->own_lock = &c->lock;
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220 wev->own_lock = &c->lock;
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221 #endif
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222
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112
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223 rev->channel = 1;
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224 wev->channel = 1;
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225
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0
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226 ev = (event == NGX_READ_EVENT) ? rev : wev;
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227
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58
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228 ev->handler = handler;
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0
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229
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230 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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231 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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232 ngx_free_connection(c);
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0
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233 return NGX_ERROR;
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234 }
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126
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235
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236 } else {
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0
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237 if (ngx_add_event(ev, event, 0) == NGX_ERROR) {
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92
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238 ngx_free_connection(c);
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0
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239 return NGX_ERROR;
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240 }
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241 }
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242
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243 return NGX_OK;
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244 }
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245
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246
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92
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247 void
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248 ngx_close_channel(ngx_fd_t *fd, ngx_log_t *log)
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0
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249 {
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250 if (close(fd[0]) == -1) {
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14
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251 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
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0
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252 }
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253
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254 if (close(fd[1]) == -1) {
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14
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255 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
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0
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256 }
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257 }
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