src/server/safs/cgi.c

Sun, 29 Jan 2017 09:04:06 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 29 Jan 2017 09:04:06 +0100
branch
srvctrl
changeset 166
c07122f66676
parent 151
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child 161
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permissions
-rw-r--r--

adds debug log level

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2016 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "cgi.h"
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30
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31 #include <stdio.h>
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32 #include <stdlib.h>
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33 #include <unistd.h>
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34
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35 #include <sys/types.h>
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36 #include <signal.h>
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37 #include <sys/wait.h>
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38
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39 #include "../util/util.h"
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40 #include "../util/pblock.h"
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41 #include "../../ucx/string.h"
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42
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43 #include "../util/io.h"
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44
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45 #include "cgiutils.h"
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46
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47 #define CGI_VARS 32
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48
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49 #define CGI_RESPONSE_PARSER_BUFLEN 2048
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50 #define CGI_RESPONSE_MAX_LINE_LENGTH 512
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51
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52 int send_cgi(pblock *pb, Session *sn, Request *rq) {
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53 char *path = pblock_findkeyval(pb_key_path, rq->vars);
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54 char *ctlen = pblock_findkeyval(pb_key_content_length, rq->headers);
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55 int64_t content_length = 0;
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56
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57 if(ctlen) {
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58 if(!util_strtoint(ctlen, &content_length)) {
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59 log_ereport(
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60 LOG_FAILURE,
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61 "send-cgi: content-length header is not an integer");
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62 protocol_status(sn, rq, 400, NULL);
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63 return REQ_ABORTED;
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64 }
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65 }
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66
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67 struct stat s;
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68 if(stat(path, &s)) {
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69 int statuscode = util_errno2status(errno);
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70 protocol_status(sn, rq, statuscode, NULL);
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71 return REQ_ABORTED;
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72 }
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73 if(S_ISDIR(s.st_mode)) {
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74 protocol_status(sn, rq, 403, NULL);
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75 return REQ_ABORTED;
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76 }
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77
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78 param_free(pblock_remove("content-type", rq->srvhdrs));
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79
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80 const char *args = pblock_findval("query", rq->reqpb);
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81 char **argv = cgi_create_argv(path, NULL, args);
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82
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83 char **env = http_hdrs2env(rq->headers);
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84 env = cgi_common_vars(sn, rq, env);
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85 env = cgi_specific_vars(sn, rq, args, env, 1);
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86
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87 CGIProcess cgip;
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88 int ret = cgi_start(&cgip, path, argv, env);
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89 if(ret != REQ_PROCEED) {
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90 util_env_free(env);
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91 cgi_free_argv(argv);
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92 return ret;
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93 }
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94
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95 util_env_free(env);
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96 cgi_free_argv(argv);
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97
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98 char buf[4096]; // I/O buffer
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99 ssize_t r;
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100
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101 if(content_length > 0) {
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102 ssize_t n = 0;
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103 while(n < content_length) {
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104 r = netbuf_getbytes(sn->inbuf, buf, 4096);
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105 if(r <= 0) {
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106 // TODO: handle error
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107 log_ereport(LOG_FAILURE, "send-cgi: Cannot read request body");
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108 kill(cgip.pid, SIGTERM);
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109 cgi_close(&cgip);
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110 return REQ_ABORTED;
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111 }
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112 ssize_t w = write(cgip.in[1], buf, r);
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113 if(w <= 0) {
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114 // TODO: handle error
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115 log_ereport(
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116 LOG_FAILURE,
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117 "send-cgi: Cannot send request body to cgi process");
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118 kill(cgip.pid, SIGTERM);
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119 cgi_close(&cgip);
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120 return REQ_ABORTED;
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121 }
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122 n += r;
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123 }
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124 }
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125 close(cgip.in[1]);
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126 cgip.in[1] = -1;
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127
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128 // read from child
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129 CGIResponseParser *parser = cgi_parser_new(sn, rq);
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130 WSBool cgiheader = TRUE;
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131 ssize_t wr = 0;
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132 int result = REQ_PROCEED;
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133 while((r = read(cgip.out[0], buf, 4096)) > 0) {
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134 if(cgiheader) {
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135 size_t pos;
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136 ret = cgi_parse_response(parser, buf, r, &pos);
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137 if(ret == -1) {
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138 log_ereport(
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139 LOG_FAILURE,
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140 "broken cgi script response: path: %s", path);
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141 protocol_status(sn, rq, 500, NULL);
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142 result = REQ_ABORTED;
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143 break;
118
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144 } else if(ret == 1) {
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145 cgiheader = FALSE;
124
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diff changeset
146 if(parser->status > 0) {
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diff changeset
147 protocol_status(sn, rq, parser->status, parser->msg);
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diff changeset
148 }
118
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149 http_start_response(sn, rq);
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150 if(pos < r) {
125
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diff changeset
151 wr = net_write(sn->csd, &buf[pos], r-pos);
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diff changeset
152 if(wr <= 0) {
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diff changeset
153 result = REQ_ABORTED;
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diff changeset
154 break;
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diff changeset
155 }
118
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156 }
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157 }
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158 } else {
125
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diff changeset
159 wr = net_write(sn->csd, buf, r);
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diff changeset
160 if(wr <= 0) {
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diff changeset
161 result = REQ_ABORTED;
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diff changeset
162 break;
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diff changeset
163 }
118
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164 }
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165 }
144
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166
149
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167 cgi_close(&cgip); // TODO: check return value
126
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diff changeset
168
124
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169 cgi_parser_free(parser);
125
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170 return result;
118
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171 }
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172
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173 int cgi_start(CGIProcess *p, char *path, char *const argv[], char *const envp[]) {
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174 if(pipe(p->in) || pipe(p->out)) {
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175 log_ereport(
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176 LOG_FAILURE,
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177 "send-cgi: cannot create pipe: %s",
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178 strerror(errno));
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179 return REQ_ABORTED;
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180 }
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181
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182 p->pid = fork();
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183 if(p->pid == 0) {
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184 // child
120
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185
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186 // get script directory and script name
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187 sstr_t script = sstr(path);
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188 sstr_t parent;
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189 int len = strlen(path);
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diff changeset
190 for(int i=len-1;i>=0;i--) {
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diff changeset
191 if(path[i] == '/') {
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192 script = sstrn(path + i + 1, len - i);
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193 parent = sstrdup(sstrn(path, i));
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diff changeset
194 if(chdir(parent.ptr)) {
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195 perror("cgi_start: chdir");
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diff changeset
196 free(parent.ptr);
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197 exit(-1);
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diff changeset
198 }
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diff changeset
199 free(parent.ptr);
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diff changeset
200 break;
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diff changeset
201 }
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diff changeset
202 }
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diff changeset
203
118
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204 if(dup2(p->in[0], STDIN_FILENO) == -1) {
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205 perror("cgi_start: dup2");
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206 exit(EXIT_FAILURE);
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207 }
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208 if(dup2(p->out[1], STDOUT_FILENO) == -1) {
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209 perror("cgi_start: dup2");
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210 exit(EXIT_FAILURE);
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parents:
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211 }
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parents:
diff changeset
212
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213 // we need to close this unused pipe
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214 // otherwise stdin cannot reach EOF
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215 close(p->in[1]);
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216
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217 // execute program
120
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diff changeset
218 exit(execve(script.ptr, argv, envp));
118
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219 } else {
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220 // parent
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221 close(p->out[1]);
144
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diff changeset
222 p->out[1] = -1;
118
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223 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
224
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225 return REQ_PROCEED;
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parents:
diff changeset
226 }
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diff changeset
227
149
aa016efb9ad7 fixes cgi cleanup
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diff changeset
228 int cgi_close(CGIProcess *p) {
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diff changeset
229 int status = -1;
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diff changeset
230 waitpid(p->pid, &status, 0);
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parents: 145
diff changeset
231
144
4b546c4f25ed fixes cgi fd leak
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diff changeset
232 if(p->in[0] != -1) {
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diff changeset
233 close(p->in[0]);
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diff changeset
234 }
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parents: 133
diff changeset
235 if(p->in[1] != -1) {
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parents: 133
diff changeset
236 close(p->in[1]);
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diff changeset
237 }
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parents: 133
diff changeset
238 if(p->out[0] != -1) {
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parents: 133
diff changeset
239 close(p->out[0]);
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diff changeset
240 }
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parents: 133
diff changeset
241 if(p->out[1] != -1) {
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diff changeset
242 close(p->out[1]);
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diff changeset
243 }
149
aa016efb9ad7 fixes cgi cleanup
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parents: 145
diff changeset
244
aa016efb9ad7 fixes cgi cleanup
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parents: 145
diff changeset
245 return 0;
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
246 }
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parents: 133
diff changeset
247
118
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248 CGIResponseParser* cgi_parser_new(Session *sn, Request *rq) {
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parents:
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249 CGIResponseParser* parser = pool_malloc(sn->pool, sizeof(CGIResponseParser));
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250 parser->sn = sn;
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diff changeset
251 parser->rq = rq;
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diff changeset
252 parser->tmp = ucx_buffer_new(NULL, 64, UCX_BUFFER_AUTOEXTEND);
124
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diff changeset
253 parser->status = 0;
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diff changeset
254 parser->msg = NULL;
118
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diff changeset
255 return parser;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
256 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
257
124
85985e88f63b using the status code from cgi output now
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diff changeset
258 void cgi_parser_free(CGIResponseParser *parser) {
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diff changeset
259 if(parser->tmp) {
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diff changeset
260 ucx_buffer_free(parser->tmp);
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parents: 123
diff changeset
261 }
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
262 pool_free(parser->sn->pool, parser);
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diff changeset
263 }
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parents: 123
diff changeset
264
118
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
265 /*
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parents:
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266 * parses a cgi response line and adds the response header to rq->srvhdrs
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267 * returns 0: incomplete line
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parents:
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268 * 1: successfully parsed lines
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269 * 2: cgi response header complete (empty line)
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270 * -1: error
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diff changeset
271 */
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diff changeset
272 static int parse_lines(CGIResponseParser *parser, char *buf, size_t len, int *pos) {
145
1c93281ca4bf fixes memory leaks in request_stat_path and send_cgi
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parents: 144
diff changeset
273 UcxAllocator a = util_pool_allocator(parser->sn->pool);
118
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diff changeset
274 sstr_t name;
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parents:
diff changeset
275 sstr_t value;
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parents:
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276 WSBool space = TRUE;
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parents:
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277 int i;
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parents:
diff changeset
278
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diff changeset
279 int line_begin = 0;
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diff changeset
280 int value_begin = 0;
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parents:
diff changeset
281 for(i=0;i<len;i++) {
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parents:
diff changeset
282 char c = buf[i];
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parents:
diff changeset
283 if(value_begin == line_begin && c == ':') {
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parents:
diff changeset
284 name = sstrn(buf + line_begin, i - line_begin);
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parents:
diff changeset
285 value_begin = i + 1;
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parents:
diff changeset
286 } else if(c == '\n') {
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parents:
diff changeset
287 if(value_begin == line_begin) {
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parents:
diff changeset
288 if(space) {
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parents:
diff changeset
289 *pos = i + 1;
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parents:
diff changeset
290 return 2;
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parents:
diff changeset
291 } else {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
292 // line ends with content but without ':' -> error
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parents:
diff changeset
293 return -1;
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parents:
diff changeset
294 }
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295 }
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296 value = sstrn(buf + value_begin, i - value_begin);
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297
145
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298 name = sstrlower_a(&a, sstrtrim(name));
118
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299 value = sstrtrim(value);
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300
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301 if(name.length == 0 || value.length == 0) {
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302 return -1;
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303 }
124
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304
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305 if(!sstrcmp(name, S("status"))) {
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306 sstr_t codestr = value;
133
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307 int j;
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308 for(j=0;j<codestr.length;j++) {
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309 if(!isdigit(codestr.ptr[j])) {
124
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310 break;
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311 }
133
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312 if(j > 2) {
124
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313 break;
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314 }
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315 }
133
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316 codestr.ptr[j] = '\0';
124
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317
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318 int64_t s = 0;
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319 util_strtoint(codestr.ptr, &s);
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320 parser->status = (int)s;
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321
133
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322 sstr_t msg = sstrtrim(sstrsubs(value, j + 1));
124
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323
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324 if(msg.length > 0) {
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325 parser->msg = sstrdup_pool(parser->sn->pool, msg).ptr;
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326 }
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327 } else {
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328 pblock_nvlinsert(
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329 name.ptr,
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330 name.length,
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331 value.ptr,
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332 value.length,
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333 parser->rq->srvhdrs);
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334 }
118
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335
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336 line_begin = i+1;
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337 value_begin = line_begin;
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338 space = TRUE;
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339 } else if(!isspace(c)) {
118
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340 space = FALSE;
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341 }
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342 }
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343
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344 if(i < len) {
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345 *pos = i;
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346 return 0;
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347 }
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348 return 1;
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349 }
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350
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351 /*
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352 * returns -1: error
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353 * 0: response header incomplete
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354 * 1: complete
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355 */
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356 int cgi_parse_response(CGIResponseParser *parser, char *buf, size_t len, size_t *bpos) {
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357 *bpos = 0;
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358 int pos = 0;
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359 if(parser->tmp->pos > 0) {
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360 // the tmp buffer contains an unfinished line
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361 // fill up the buffer until the line is complete
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362 WSBool nb = FALSE;
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363 for(pos=0;pos<len;pos++) {
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364 if(buf[pos] == '\n') {
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365 nb = TRUE;
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366 break;
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367 }
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368 }
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369 ucx_buffer_write(buf, 1, pos, parser->tmp);
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370
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371 if(nb) {
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372 // line complete
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373 int npos;
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374 int r = parse_lines(parser, parser->tmp->space, parser->tmp->pos, &npos);
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375 switch(r) {
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376 case -1: return -1;
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377 case 0: return -1;
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378 case 1: break;
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379 case 2: {
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380 *bpos = pos + 1;
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381 return 1;
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382 }
38bf6dd8f4e7 adds minimal cgi implementation
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383 }
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384 // reset tmp buffer
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385 parser->tmp->pos = 0;
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386 } else {
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387 if(parser->tmp->pos > CGI_RESPONSE_MAX_LINE_LENGTH) {
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388 return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
389 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
390 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
391 }
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parents:
diff changeset
392
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393 int npos = 0;
38bf6dd8f4e7 adds minimal cgi implementation
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394 int r = parse_lines(parser, buf + pos, len - pos, &npos);
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395 switch(r) {
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396 default: return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
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397 case 0:
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
398 case 1: {
38bf6dd8f4e7 adds minimal cgi implementation
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399 int newlen = len - npos;
38bf6dd8f4e7 adds minimal cgi implementation
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diff changeset
400 if(npos > 0) {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
401 ucx_buffer_write(buf + npos, 1, newlen, parser->tmp);
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
402 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
403 return 0;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
404 }
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
405 case 2: {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
406 *bpos = pos + npos;
38bf6dd8f4e7 adds minimal cgi implementation
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407 return 1;
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
408 }
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
409 }
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
410 }
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
411

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