src/server/safs/cgi.c

Sun, 06 Nov 2022 17:41:39 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 06 Nov 2022 17:41:39 +0100
changeset 417
90805bb9fbd6
parent 415
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child 430
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permissions
-rw-r--r--

prepare serverconfig parser to be also used for obj.conf and init.conf

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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 <cx/string.h>
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40
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41 #include "../util/util.h"
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42 #include "../util/pblock.h"
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43 #include "../daemon/netsite.h"
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44 #include "../util/io.h"
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45
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46 #include "cgiutils.h"
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47
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48 #define CGI_VARS 32
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49
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50 #define CGI_RESPONSE_PARSER_BUFLEN 2048
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51 #define CGI_RESPONSE_MAX_LINE_LENGTH 512
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52
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53 int send_cgi(pblock *pb, Session *sn, Request *rq) {
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54 char *path = pblock_findkeyval(pb_key_path, rq->vars);
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55 char *ctlen = pblock_findkeyval(pb_key_content_length, rq->headers);
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56 int64_t content_length = 0;
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57
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58 if(ctlen) {
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59 if(!util_strtoint(ctlen, &content_length)) {
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60 log_ereport(
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61 LOG_FAILURE,
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62 "send-cgi: content-length header is not an integer");
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63 protocol_status(sn, rq, 400, NULL);
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64 return REQ_ABORTED;
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65 }
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66 }
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67
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68 struct stat s;
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69 if(stat(path, &s)) {
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70 int statuscode = util_errno2status(errno);
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71 protocol_status(sn, rq, statuscode, NULL);
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72 return REQ_ABORTED;
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73 }
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74 if(S_ISDIR(s.st_mode)) {
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75 protocol_status(sn, rq, 403, NULL);
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76 return REQ_ABORTED;
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77 }
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78
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79 param_free(pblock_remove("content-type", rq->srvhdrs));
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80
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81 const char *args = pblock_findval("query", rq->reqpb);
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82 char **argv = cgi_create_argv(path, NULL, args);
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83
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84 char **env = http_hdrs2env(rq->headers);
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85 env = cgi_common_vars(sn, rq, env);
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86 env = cgi_specific_vars(sn, rq, args, env, 1);
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87
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88 CGIProcess cgip;
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89 int ret = cgi_start(&cgip, path, argv, env);
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90 if(ret != REQ_PROCEED) {
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91 util_env_free(env);
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92 cgi_free_argv(argv);
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93 return ret;
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94 }
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95
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96 util_env_free(env);
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97 cgi_free_argv(argv);
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98
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99 char buf[4096]; // I/O buffer
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100 ssize_t r;
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101
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102 if(content_length > 0) {
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103 ssize_t n = 0;
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104 while(n < content_length) {
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105 r = netbuf_getbytes(sn->inbuf, buf, 4096);
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106 if(r <= 0) {
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107 // TODO: handle error
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108 log_ereport(
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109 LOG_FAILURE,
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110 "send-cgi: script: %s: cannot read request body",
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111 path);
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112 kill(cgip.pid, SIGTERM);
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113 cgi_close(&cgip);
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114 return REQ_ABORTED;
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115 }
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116 ssize_t w = write(cgip.in[1], buf, r);
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117 if(w <= 0) {
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118 // TODO: handle error
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119 log_ereport(
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120 LOG_FAILURE,
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121 "send-cgi: script: %s: cannot send request body to cgi process",
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122 path);
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123 kill(cgip.pid, SIGKILL);
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124 cgi_close(&cgip);
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125 return REQ_ABORTED;
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126 }
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127 n += r;
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128 }
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129 }
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130 system_close(cgip.in[1]);
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131 cgip.in[1] = -1;
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132
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133 // read from child
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134 CGIResponseParser *parser = cgi_parser_new(sn, rq);
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135 WSBool cgiheader = TRUE;
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136 ssize_t wr = 0;
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137 int result = REQ_PROCEED;
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138 size_t response_length = 0;
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139 while((r = read(cgip.out[0], buf, 4096)) > 0) {
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140 if(cgiheader) {
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141 size_t pos;
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142 ret = cgi_parse_response(parser, buf, r, &pos);
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143 if(ret == -1) {
162
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parents: 161
diff changeset
144 log_ereport(
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parents: 161
diff changeset
145 LOG_FAILURE,
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parents: 161
diff changeset
146 "broken cgi script response: path: %s", path);
118
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147 protocol_status(sn, rq, 500, NULL);
125
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diff changeset
148 result = REQ_ABORTED;
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parents: 124
diff changeset
149 break;
118
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parents:
diff changeset
150 } else if(ret == 1) {
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151 cgiheader = FALSE;
124
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diff changeset
152 if(parser->status > 0) {
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diff changeset
153 protocol_status(sn, rq, parser->status, parser->msg);
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diff changeset
154 }
118
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diff changeset
155 http_start_response(sn, rq);
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156 if(pos < r) {
162
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parents: 161
diff changeset
157 response_length += r-pos;
125
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diff changeset
158 wr = net_write(sn->csd, &buf[pos], r-pos);
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parents: 124
diff changeset
159 if(wr <= 0) {
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diff changeset
160 result = REQ_ABORTED;
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parents: 124
diff changeset
161 break;
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parents: 124
diff changeset
162 }
118
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163 }
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parents:
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164 }
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parents:
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165 } else {
164
6f47eb624665 fixes cgi content length check
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diff changeset
166 response_length += r;
125
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parents: 124
diff changeset
167 wr = net_write(sn->csd, buf, r);
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diff changeset
168 if(wr <= 0) {
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diff changeset
169 result = REQ_ABORTED;
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diff changeset
170 break;
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parents: 124
diff changeset
171 }
118
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172 }
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parents:
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173 }
144
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parents: 133
diff changeset
174
162
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diff changeset
175 char *ctlen_header = pblock_findkeyval(pb_key_content_length, rq->srvhdrs);
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diff changeset
176 if(ctlen_header) {
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diff changeset
177 int64_t ctlenhdr;
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diff changeset
178 if(util_strtoint(ctlen_header, &ctlenhdr)) {
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parents: 161
diff changeset
179 if(ctlenhdr != response_length) {
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diff changeset
180 log_ereport(
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diff changeset
181 LOG_FAILURE,
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parents: 161
diff changeset
182 "cgi-send: script: %s: content length mismatch",
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parents: 161
diff changeset
183 path);
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parents: 161
diff changeset
184 rq->rq_attr.keep_alive = 0;
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parents: 161
diff changeset
185 result = REQ_ABORTED;
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diff changeset
186 }
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parents: 161
diff changeset
187 }
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parents: 161
diff changeset
188 }
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parents: 161
diff changeset
189
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
190 if(result == REQ_ABORTED) {
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parents: 161
diff changeset
191 log_ereport(LOG_FAILURE, "cgi-send: kill script: %s", path);
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parents: 161
diff changeset
192 kill(cgip.pid, SIGKILL);
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diff changeset
193 }
359
79b28ae7bfbd check cgi exit code
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parents: 254
diff changeset
194
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diff changeset
195 int exit_code = cgi_close(&cgip);
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parents: 254
diff changeset
196 if(exit_code != 0) {
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parents: 254
diff changeset
197 log_ereport(LOG_FAILURE, "send-cgi: script: %s exited with code %d", path, exit_code);
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parents: 254
diff changeset
198 ret = REQ_ABORTED;
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parents: 254
diff changeset
199 }
126
631aaa01b2b5 fixes chunked transfer encoding
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parents: 125
diff changeset
200
124
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diff changeset
201 cgi_parser_free(parser);
125
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diff changeset
202 return result;
118
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203 }
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parents:
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204
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205 int cgi_start(CGIProcess *p, char *path, char *const argv[], char *const envp[]) {
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206 if(pipe(p->in) || pipe(p->out)) {
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parents:
diff changeset
207 log_ereport(
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diff changeset
208 LOG_FAILURE,
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parents:
diff changeset
209 "send-cgi: cannot create pipe: %s",
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210 strerror(errno));
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211 return REQ_ABORTED;
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parents:
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212 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
213
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parents:
diff changeset
214 p->pid = fork();
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diff changeset
215 if(p->pid == 0) {
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parents:
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216 // child
120
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
217
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diff changeset
218 // get script directory and script name
415
d938228c382e switch from ucx 2 to 3
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diff changeset
219 cxstring script = cx_str(path);
d938228c382e switch from ucx 2 to 3
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parents: 359
diff changeset
220 cxmutstr parent;
120
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
221 int len = strlen(path);
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
222 for(int i=len-1;i>=0;i--) {
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parents: 119
diff changeset
223 if(path[i] == '/') {
415
d938228c382e switch from ucx 2 to 3
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parents: 359
diff changeset
224 script = cx_strn(path + i + 1, len - i);
d938228c382e switch from ucx 2 to 3
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parents: 359
diff changeset
225 parent = cx_strdup(cx_strn(path, i));
120
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
226 if(chdir(parent.ptr)) {
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
227 perror("cgi_start: chdir");
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
228 free(parent.ptr);
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
229 exit(-1);
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
230 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
231 free(parent.ptr);
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
232 break;
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
233 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
234 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
235
118
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
236 if(dup2(p->in[0], STDIN_FILENO) == -1) {
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parents:
diff changeset
237 perror("cgi_start: dup2");
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parents:
diff changeset
238 exit(EXIT_FAILURE);
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parents:
diff changeset
239 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
240 if(dup2(p->out[1], STDOUT_FILENO) == -1) {
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parents:
diff changeset
241 perror("cgi_start: dup2");
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parents:
diff changeset
242 exit(EXIT_FAILURE);
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
243 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
244
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
245 // we need to close this unused pipe
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parents:
diff changeset
246 // otherwise stdin cannot reach EOF
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
247 system_close(p->in[1]);
118
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parents:
diff changeset
248
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
249 // execute program
120
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
250 exit(execve(script.ptr, argv, envp));
118
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parents:
diff changeset
251 } else {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
252 // parent
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
253 system_close(p->out[1]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
254 p->out[1] = -1;
118
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
255 }
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 return REQ_PROCEED;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
258 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
259
162
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
260 int cgi_close(CGIProcess *p) {
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parents: 161
diff changeset
261 int status = -1;
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
262 waitpid(p->pid, &status, 0);
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
263
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
264 if(p->in[0] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
265 system_close(p->in[0]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
266 }
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
267 if(p->in[1] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
268 system_close(p->in[1]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
269 }
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
270 if(p->out[0] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
271 system_close(p->out[0]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
272 }
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
273 if(p->out[1] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
274 system_close(p->out[1]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
275 }
162
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
276
359
79b28ae7bfbd check cgi exit code
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parents: 254
diff changeset
277 return status;
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
278 }
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
279
118
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parents:
diff changeset
280 CGIResponseParser* cgi_parser_new(Session *sn, Request *rq) {
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parents:
diff changeset
281 CGIResponseParser* parser = pool_malloc(sn->pool, sizeof(CGIResponseParser));
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parents:
diff changeset
282 parser->sn = sn;
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parents:
diff changeset
283 parser->rq = rq;
124
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
284 parser->status = 0;
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
285 parser->msg = NULL;
415
d938228c382e switch from ucx 2 to 3
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 359
diff changeset
286 cxBufferInit(&parser->tmp, NULL, 64, pool_allocator(sn->pool), CX_BUFFER_AUTO_EXTEND|CX_BUFFER_FREE_CONTENTS);
118
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parents:
diff changeset
287 return parser;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
288 }
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289
124
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290 void cgi_parser_free(CGIResponseParser *parser) {
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291 if(parser->tmp.space) {
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292 cxBufferDestroy(&parser->tmp);
124
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293 }
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294 pool_free(parser->sn->pool, parser);
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295 }
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296
118
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297 /*
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298 * parses a cgi response line and adds the response header to rq->srvhdrs
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299 * returns 0: incomplete line
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300 * 1: successfully parsed lines
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301 * 2: cgi response header complete (empty line)
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302 * -1: error
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303 */
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304 static int parse_lines(CGIResponseParser *parser, char *buf, size_t len, int *pos) {
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305 CxAllocator *a = pool_allocator(parser->sn->pool);
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306 cxmutstr name;
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307 cxmutstr value;
118
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308 WSBool space = TRUE;
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309 int i;
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310
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311 int line_begin = 0;
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312 int value_begin = 0;
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313 for(i=0;i<len;i++) {
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314 char c = buf[i];
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315 if(value_begin == line_begin && c == ':') {
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316 name = cx_mutstrn(buf + line_begin, i - line_begin);
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317 value_begin = i + 1;
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318 } else if(c == '\n') {
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319 if(value_begin == line_begin) {
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320 if(space) {
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321 *pos = i + 1;
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322 return 2;
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323 } else {
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324 // line ends with content but without ':' -> error
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325 return -1;
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326 }
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327 }
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328 value = cx_mutstrn(buf + value_begin, i - value_begin);
118
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329
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330 cx_strlower(name);
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331 name = cx_strdup_a(a, cx_strtrim((cxstring){name.ptr, name.length}));
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332 value = cx_strtrim_m(value);
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333
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334 if(name.length == 0 || value.length == 0) {
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335 return -1;
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336 }
124
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337
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338 if(!cx_strcmp((cxstring){name.ptr, name.length}, (cxstring)CX_STR("status"))) {
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339 cxmutstr codestr = value;
133
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340 int j;
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341 for(j=0;j<codestr.length;j++) {
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342 if(!isdigit(codestr.ptr[j])) {
124
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343 break;
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344 }
133
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345 if(j > 2) {
124
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346 break;
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347 }
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348 }
133
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349 codestr.ptr[j] = '\0';
124
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350
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351 int64_t s = 0;
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352 util_strtoint(codestr.ptr, &s);
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353 parser->status = (int)s;
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354
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355 cxmutstr msg = cx_strtrim_m(cx_strsubs_m(value, j + 1));
124
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356
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357 if(msg.length > 0) {
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358 parser->msg = cx_strdup_pool(parser->sn->pool, msg).ptr;
124
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359 }
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360 } else {
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361 pblock_nvlinsert(
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362 name.ptr,
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363 name.length,
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364 value.ptr,
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365 value.length,
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366 parser->rq->srvhdrs);
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367 }
118
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368
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369 line_begin = i+1;
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370 value_begin = line_begin;
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371 space = TRUE;
121
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diff changeset
372 } else if(!isspace(c)) {
118
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373 space = FALSE;
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374 }
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375 }
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376
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377 if(i < len) {
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378 *pos = i;
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379 return 0;
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380 }
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381 return 1;
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382 }
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383
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384 /*
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385 * returns -1: error
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386 * 0: response header incomplete
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387 * 1: complete
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388 */
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389 int cgi_parse_response(CGIResponseParser *parser, char *buf, size_t len, size_t *bpos) {
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390 *bpos = 0;
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391 int pos = 0;
415
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diff changeset
392 if(parser->tmp.pos > 0) {
118
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393 // the tmp buffer contains an unfinished line
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394 // fill up the buffer until the line is complete
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395 WSBool nb = FALSE;
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396 for(pos=0;pos<len;pos++) {
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397 if(buf[pos] == '\n') {
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398 nb = TRUE;
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diff changeset
399 break;
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diff changeset
400 }
38bf6dd8f4e7 adds minimal cgi implementation
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diff changeset
401 }
415
d938228c382e switch from ucx 2 to 3
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diff changeset
402 cxBufferWrite(buf, 1, pos, &parser->tmp);
118
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403
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
404 if(nb) {
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parents:
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405 // line complete
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diff changeset
406 int npos;
415
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diff changeset
407 int r = parse_lines(parser, parser->tmp.space, parser->tmp.pos, &npos);
118
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408 switch(r) {
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409 case -1: return -1;
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410 case 0: return -1;
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411 case 1: break;
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diff changeset
412 case 2: {
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413 *bpos = pos + 1;
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414 return 1;
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parents:
diff changeset
415 }
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416 }
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417 // reset tmp buffer
415
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diff changeset
418 parser->tmp.pos = 0;
118
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419 } else {
415
d938228c382e switch from ucx 2 to 3
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diff changeset
420 if(parser->tmp.pos > CGI_RESPONSE_MAX_LINE_LENGTH) {
118
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421 return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
422 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
423 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
424 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
425
38bf6dd8f4e7 adds minimal cgi implementation
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diff changeset
426 int npos = 0;
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diff changeset
427 int r = parse_lines(parser, buf + pos, len - pos, &npos);
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428 switch(r) {
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diff changeset
429 default: return -1;
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parents:
diff changeset
430 case 0:
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diff changeset
431 case 1: {
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diff changeset
432 int newlen = len - npos;
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diff changeset
433 if(npos > 0) {
415
d938228c382e switch from ucx 2 to 3
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diff changeset
434 cxBufferWrite(buf + npos, 1, newlen, &parser->tmp);
118
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parents:
diff changeset
435 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
436 return 0;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
437 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
438 case 2: {
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
439 *bpos = pos + npos;
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
440 return 1;
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
441 }
38bf6dd8f4e7 adds minimal cgi implementation
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
442 }
171
af7e2d80dee6 adds wrapper for close syscall with error handling
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 164
diff changeset
443 }

mercurial