src/server/safs/cgi.c

Mon, 06 Mar 2017 17:32:26 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Mon, 06 Mar 2017 17:32:26 +0100
changeset 179
ef6827505bd2
parent 171
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child 254
4784c14aa639
permissions
-rw-r--r--

merge srvctrl into default branch

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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 #include "../daemon/netsite.h"
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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(
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108 LOG_FAILURE,
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109 "send-cgi: script: %s: cannot read request body",
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110 path);
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111 kill(cgip.pid, SIGTERM);
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112 cgi_close(&cgip);
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113 return REQ_ABORTED;
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114 }
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115 ssize_t w = write(cgip.in[1], buf, r);
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116 if(w <= 0) {
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117 // TODO: handle error
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118 log_ereport(
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119 LOG_FAILURE,
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120 "send-cgi: script: %s: cannot send request body to cgi process",
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121 path);
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122 kill(cgip.pid, SIGKILL);
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123 cgi_close(&cgip);
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124 return REQ_ABORTED;
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125 }
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126 n += r;
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127 }
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128 }
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129 system_close(cgip.in[1]);
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130 cgip.in[1] = -1;
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131
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132 // read from child
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133 CGIResponseParser *parser = cgi_parser_new(sn, rq);
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134 WSBool cgiheader = TRUE;
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135 ssize_t wr = 0;
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136 int result = REQ_PROCEED;
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137 size_t response_length = 0;
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138 while((r = read(cgip.out[0], buf, 4096)) > 0) {
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139 if(cgiheader) {
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140 size_t pos;
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141 ret = cgi_parse_response(parser, buf, r, &pos);
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142 if(ret == -1) {
162
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parents: 161
diff changeset
143 log_ereport(
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parents: 161
diff changeset
144 LOG_FAILURE,
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diff changeset
145 "broken cgi script response: path: %s", path);
118
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146 protocol_status(sn, rq, 500, NULL);
125
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diff changeset
147 result = REQ_ABORTED;
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diff changeset
148 break;
118
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diff changeset
149 } else if(ret == 1) {
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150 cgiheader = FALSE;
124
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diff changeset
151 if(parser->status > 0) {
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diff changeset
152 protocol_status(sn, rq, parser->status, parser->msg);
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diff changeset
153 }
118
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154 http_start_response(sn, rq);
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155 if(pos < r) {
162
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diff changeset
156 response_length += r-pos;
125
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parents: 124
diff changeset
157 wr = net_write(sn->csd, &buf[pos], r-pos);
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diff changeset
158 if(wr <= 0) {
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parents: 124
diff changeset
159 result = REQ_ABORTED;
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parents: 124
diff changeset
160 break;
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parents: 124
diff changeset
161 }
118
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162 }
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parents:
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163 }
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parents:
diff changeset
164 } else {
164
6f47eb624665 fixes cgi content length check
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diff changeset
165 response_length += r;
125
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parents: 124
diff changeset
166 wr = net_write(sn->csd, buf, r);
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diff changeset
167 if(wr <= 0) {
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diff changeset
168 result = REQ_ABORTED;
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parents: 124
diff changeset
169 break;
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parents: 124
diff changeset
170 }
118
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171 }
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parents:
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172 }
144
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parents: 133
diff changeset
173
162
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parents: 161
diff changeset
174 char *ctlen_header = pblock_findkeyval(pb_key_content_length, rq->srvhdrs);
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diff changeset
175 if(ctlen_header) {
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diff changeset
176 int64_t ctlenhdr;
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diff changeset
177 if(util_strtoint(ctlen_header, &ctlenhdr)) {
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diff changeset
178 if(ctlenhdr != response_length) {
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parents: 161
diff changeset
179 log_ereport(
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diff changeset
180 LOG_FAILURE,
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parents: 161
diff changeset
181 "cgi-send: script: %s: content length mismatch",
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parents: 161
diff changeset
182 path);
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parents: 161
diff changeset
183 rq->rq_attr.keep_alive = 0;
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parents: 161
diff changeset
184 result = REQ_ABORTED;
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parents: 161
diff changeset
185 }
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parents: 161
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 if(result == REQ_ABORTED) {
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parents: 161
diff changeset
190 log_ereport(LOG_FAILURE, "cgi-send: kill script: %s", path);
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parents: 161
diff changeset
191 kill(cgip.pid, SIGKILL);
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parents: 161
diff changeset
192 }
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diff changeset
193 cgi_close(&cgip); // TODO: check return value
126
631aaa01b2b5 fixes chunked transfer encoding
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parents: 125
diff changeset
194
124
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diff changeset
195 cgi_parser_free(parser);
125
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diff changeset
196 return result;
118
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197 }
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parents:
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198
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199 int cgi_start(CGIProcess *p, char *path, char *const argv[], char *const envp[]) {
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200 if(pipe(p->in) || pipe(p->out)) {
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parents:
diff changeset
201 log_ereport(
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parents:
diff changeset
202 LOG_FAILURE,
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parents:
diff changeset
203 "send-cgi: cannot create pipe: %s",
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parents:
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204 strerror(errno));
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205 return REQ_ABORTED;
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parents:
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206 }
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parents:
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207
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diff changeset
208 p->pid = fork();
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parents:
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209 if(p->pid == 0) {
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parents:
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210 // child
120
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
211
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diff changeset
212 // get script directory and script name
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parents: 119
diff changeset
213 sstr_t script = sstr(path);
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diff changeset
214 sstr_t parent;
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
215 int len = strlen(path);
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parents: 119
diff changeset
216 for(int i=len-1;i>=0;i--) {
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parents: 119
diff changeset
217 if(path[i] == '/') {
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parents: 119
diff changeset
218 script = sstrn(path + i + 1, len - i);
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parents: 119
diff changeset
219 parent = sstrdup(sstrn(path, i));
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parents: 119
diff changeset
220 if(chdir(parent.ptr)) {
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
221 perror("cgi_start: chdir");
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
222 free(parent.ptr);
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parents: 119
diff changeset
223 exit(-1);
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parents: 119
diff changeset
224 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
225 free(parent.ptr);
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
226 break;
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
227 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
228 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
229
118
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
230 if(dup2(p->in[0], STDIN_FILENO) == -1) {
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parents:
diff changeset
231 perror("cgi_start: dup2");
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
232 exit(EXIT_FAILURE);
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
233 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
234 if(dup2(p->out[1], STDOUT_FILENO) == -1) {
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parents:
diff changeset
235 perror("cgi_start: dup2");
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
236 exit(EXIT_FAILURE);
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
237 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
238
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
239 // we need to close this unused pipe
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parents:
diff changeset
240 // otherwise stdin cannot reach EOF
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
241 system_close(p->in[1]);
118
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parents:
diff changeset
242
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
243 // execute program
120
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
244 exit(execve(script.ptr, argv, envp));
118
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parents:
diff changeset
245 } else {
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parents:
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246 // parent
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
247 system_close(p->out[1]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
248 p->out[1] = -1;
118
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
249 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
250
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
251 return REQ_PROCEED;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
252 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
253
162
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
254 int cgi_close(CGIProcess *p) {
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parents: 161
diff changeset
255 int status = -1;
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parents: 161
diff changeset
256 waitpid(p->pid, &status, 0);
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parents: 161
diff changeset
257
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
258 if(p->in[0] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
259 system_close(p->in[0]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
260 }
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
261 if(p->in[1] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
262 system_close(p->in[1]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
263 }
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
264 if(p->out[0] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
265 system_close(p->out[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->out[1] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
268 system_close(p->out[1]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
269 }
162
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
270
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
271 return 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
118
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parents:
diff changeset
274 CGIResponseParser* cgi_parser_new(Session *sn, Request *rq) {
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parents:
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275 CGIResponseParser* parser = pool_malloc(sn->pool, sizeof(CGIResponseParser));
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parents:
diff changeset
276 parser->sn = sn;
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parents:
diff changeset
277 parser->rq = rq;
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parents:
diff changeset
278 parser->tmp = ucx_buffer_new(NULL, 64, UCX_BUFFER_AUTOEXTEND);
124
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parents: 123
diff changeset
279 parser->status = 0;
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diff changeset
280 parser->msg = NULL;
118
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parents:
diff changeset
281 return parser;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
282 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
283
124
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
284 void cgi_parser_free(CGIResponseParser *parser) {
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
285 if(parser->tmp) {
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
286 ucx_buffer_free(parser->tmp);
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diff changeset
287 }
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parents: 123
diff changeset
288 pool_free(parser->sn->pool, parser);
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289 }
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290
118
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291 /*
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292 * parses a cgi response line and adds the response header to rq->srvhdrs
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293 * returns 0: incomplete line
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294 * 1: successfully parsed lines
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295 * 2: cgi response header complete (empty line)
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296 * -1: error
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297 */
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298 static int parse_lines(CGIResponseParser *parser, char *buf, size_t len, int *pos) {
145
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299 UcxAllocator a = util_pool_allocator(parser->sn->pool);
118
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300 sstr_t name;
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301 sstr_t value;
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302 WSBool space = TRUE;
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303 int i;
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304
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305 int line_begin = 0;
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306 int value_begin = 0;
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307 for(i=0;i<len;i++) {
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308 char c = buf[i];
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309 if(value_begin == line_begin && c == ':') {
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310 name = sstrn(buf + line_begin, i - line_begin);
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311 value_begin = i + 1;
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312 } else if(c == '\n') {
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313 if(value_begin == line_begin) {
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314 if(space) {
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315 *pos = i + 1;
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316 return 2;
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317 } else {
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318 // line ends with content but without ':' -> error
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319 return -1;
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320 }
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321 }
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322 value = sstrn(buf + value_begin, i - value_begin);
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323
145
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diff changeset
324 name = sstrlower_a(&a, sstrtrim(name));
118
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325 value = sstrtrim(value);
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326
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327 if(name.length == 0 || value.length == 0) {
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328 return -1;
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329 }
124
85985e88f63b using the status code from cgi output now
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diff changeset
330
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diff changeset
331 if(!sstrcmp(name, S("status"))) {
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332 sstr_t codestr = value;
133
87b405d61f64 improves event handler and ssl error handling
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diff changeset
333 int j;
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334 for(j=0;j<codestr.length;j++) {
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diff changeset
335 if(!isdigit(codestr.ptr[j])) {
124
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336 break;
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337 }
133
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338 if(j > 2) {
124
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339 break;
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340 }
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341 }
133
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342 codestr.ptr[j] = '\0';
124
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343
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diff changeset
344 int64_t s = 0;
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345 util_strtoint(codestr.ptr, &s);
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346 parser->status = (int)s;
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347
133
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348 sstr_t msg = sstrtrim(sstrsubs(value, j + 1));
124
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349
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350 if(msg.length > 0) {
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351 parser->msg = sstrdup_pool(parser->sn->pool, msg).ptr;
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352 }
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353 } else {
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diff changeset
354 pblock_nvlinsert(
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355 name.ptr,
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diff changeset
356 name.length,
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diff changeset
357 value.ptr,
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diff changeset
358 value.length,
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359 parser->rq->srvhdrs);
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diff changeset
360 }
118
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361
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362 line_begin = i+1;
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363 value_begin = line_begin;
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364 space = TRUE;
121
a881dc866e23 adds more CGI stuff
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diff changeset
365 } else if(!isspace(c)) {
118
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366 space = FALSE;
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367 }
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parents:
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368 }
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369
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370 if(i < len) {
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371 *pos = i;
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372 return 0;
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parents:
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373 }
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374 return 1;
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parents:
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375 }
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parents:
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376
38bf6dd8f4e7 adds minimal cgi implementation
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377 /*
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378 * returns -1: error
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379 * 0: response header incomplete
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380 * 1: complete
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diff changeset
381 */
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diff changeset
382 int cgi_parse_response(CGIResponseParser *parser, char *buf, size_t len, size_t *bpos) {
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parents:
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383 *bpos = 0;
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parents:
diff changeset
384 int pos = 0;
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parents:
diff changeset
385 if(parser->tmp->pos > 0) {
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parents:
diff changeset
386 // the tmp buffer contains an unfinished line
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parents:
diff changeset
387 // fill up the buffer until the line is complete
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388 WSBool nb = FALSE;
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parents:
diff changeset
389 for(pos=0;pos<len;pos++) {
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parents:
diff changeset
390 if(buf[pos] == '\n') {
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391 nb = TRUE;
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parents:
diff changeset
392 break;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
393 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
394 }
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parents:
diff changeset
395 ucx_buffer_write(buf, 1, pos, parser->tmp);
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parents:
diff changeset
396
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
397 if(nb) {
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parents:
diff changeset
398 // line complete
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parents:
diff changeset
399 int npos;
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diff changeset
400 int r = parse_lines(parser, parser->tmp->space, parser->tmp->pos, &npos);
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parents:
diff changeset
401 switch(r) {
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parents:
diff changeset
402 case -1: return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
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403 case 0: return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
404 case 1: break;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
405 case 2: {
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parents:
diff changeset
406 *bpos = pos + 1;
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parents:
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407 return 1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
408 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
409 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
410 // reset tmp buffer
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parents:
diff changeset
411 parser->tmp->pos = 0;
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parents:
diff changeset
412 } else {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
413 if(parser->tmp->pos > CGI_RESPONSE_MAX_LINE_LENGTH) {
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parents:
diff changeset
414 return -1;
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parents:
diff changeset
415 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
416 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
417 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
418
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
419 int npos = 0;
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parents:
diff changeset
420 int r = parse_lines(parser, buf + pos, len - pos, &npos);
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parents:
diff changeset
421 switch(r) {
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diff changeset
422 default: return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
423 case 0:
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
424 case 1: {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
425 int newlen = len - npos;
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parents:
diff changeset
426 if(npos > 0) {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
427 ucx_buffer_write(buf + npos, 1, newlen, parser->tmp);
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
428 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
429 return 0;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
430 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
431 case 2: {
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parents:
diff changeset
432 *bpos = pos + npos;
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parents:
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433 return 1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
434 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
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435 }
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
436 }

mercurial