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8cc51634 FT |
1 | /* |
2 | ashd - A Sane HTTP Daemon | |
3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
21 | #include <stdio.h> | |
22 | #include <unistd.h> | |
23 | #include <errno.h> | |
24 | #include <ctype.h> | |
25 | #include <signal.h> | |
26 | ||
27 | #ifdef HAVE_CONFIG_H | |
28 | #include <config.h> | |
29 | #endif | |
30 | #include <utils.h> | |
31 | #include <log.h> | |
32 | ||
33 | static char **environ; | |
34 | ||
35 | static void passdata(FILE *in, FILE *out) | |
36 | { | |
37 | int ret; | |
38 | char *buf; | |
39 | ||
40 | buf = smalloc(65536); | |
41 | while(!feof(in)) { | |
42 | ret = fread(buf, 1, 65536, in); | |
43 | if(ferror(in)) { | |
44 | flog(LOG_ERR, "sendfile: could not read input: %s", strerror(errno)); | |
45 | break; | |
46 | } | |
47 | if(fwrite(buf, 1, ret, out) != ret) { | |
48 | flog(LOG_ERR, "sendfile: could not write output: %s", strerror(errno)); | |
49 | break; | |
50 | } | |
51 | } | |
52 | free(buf); | |
53 | } | |
54 | ||
55 | static void forkchild(char *prog, char *file, char *method, char *url, char *rest, int *infd, int *outfd) | |
56 | { | |
57 | int i; | |
58 | char *qp, **env; | |
59 | int inp[2], outp[2]; | |
60 | pid_t pid; | |
61 | ||
62 | pipe(inp); | |
63 | pipe(outp); | |
64 | if((pid = fork()) < 0) { | |
65 | flog(LOG_ERR, "callcgi: could not fork"); | |
66 | exit(1); | |
67 | } | |
68 | if(pid == 0) { | |
69 | close(inp[1]); | |
70 | close(outp[0]); | |
71 | dup2(inp[0], 0); | |
72 | dup2(outp[1], 1); | |
73 | for(i = 3; i < FD_SETSIZE; i++) | |
74 | close(i); | |
75 | if((qp = strchr(url, '?')) != NULL) | |
76 | *(qp++) = 0; | |
77 | /* | |
78 | * XXX: Currently missing: | |
79 | * SERVER_NAME (Partially) | |
80 | * SERVER_PORT | |
81 | */ | |
82 | putenv(sprintf2("SERVER_SOFTWARE=ashd/%s", VERSION)); | |
83 | putenv("GATEWAY_INTERFACE=CGI/1.1"); | |
84 | if(getenv("HTTP_VERSION")) | |
85 | putenv(sprintf2("SERVER_PROTOCOL=HTTP/%s", getenv("HTTP_VERSION"))); | |
86 | putenv(sprintf2("REQUEST_METHOD=%s", method)); | |
87 | putenv(sprintf2("PATH_INFO=%s", rest)); | |
88 | putenv(sprintf2("SCRIPT_NAME=%s", url)); | |
89 | putenv(sprintf2("QUERY_STRING=%s", qp?qp:"")); | |
90 | if(getenv("REQ_HOST")) | |
91 | putenv(sprintf2("SERVER_NAME=%s", getenv("REQ_HOST"))); | |
92 | if(getenv("REQ_X_ASH_ADDRESS")) | |
93 | putenv(sprintf2("REMOTE_ADDR=%s", getenv("REQ_X_ASH_ADDRESS"))); | |
94 | if(getenv("REQ_CONTENT_TYPE")) | |
95 | putenv(sprintf2("CONTENT_TYPE=%s", getenv("REQ_CONTENT_TYPE"))); | |
96 | if(getenv("REQ_CONTENT_LENGTH")) | |
97 | putenv(sprintf2("CONTENT_LENGTH=%s", getenv("REQ_CONTENT_LENGTH"))); | |
98 | for(env = environ; *env; env++) { | |
99 | if(!strncmp(*env, "REQ_", 4)) | |
100 | putenv(sprintf2("HTTP_%s", (*env) + 4)); | |
101 | } | |
102 | /* | |
103 | * This is (understandably) missing from the CGI | |
104 | * specification, but PHP seems to require it. | |
105 | */ | |
106 | putenv(sprintf2("SCRIPT_FILENAME=%s", file)); | |
107 | execlp(prog, prog, file, NULL); | |
108 | exit(127); | |
109 | } | |
110 | close(inp[0]); | |
111 | close(outp[1]); | |
112 | *infd = inp[1]; | |
113 | *outfd = outp[0]; | |
114 | } | |
115 | ||
116 | static void trim(struct charbuf *buf) | |
117 | { | |
118 | char *p; | |
119 | ||
120 | for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++); | |
121 | memmove(buf->b, p, buf->d -= (p - buf->b)); | |
122 | for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--); | |
123 | } | |
124 | ||
125 | static char **parseheaders(FILE *s) | |
126 | { | |
127 | int c, state; | |
128 | struct charvbuf hbuf; | |
129 | struct charbuf buf; | |
130 | ||
131 | bufinit(hbuf); | |
132 | bufinit(buf); | |
133 | state = 0; | |
134 | while(1) { | |
135 | c = fgetc(s); | |
136 | again: | |
137 | if(state == 0) { | |
138 | if(c == '\r') { | |
139 | } else if(c == '\n') { | |
140 | break; | |
141 | } else if(c == EOF) { | |
142 | goto fail; | |
143 | } else { | |
144 | state = 1; | |
145 | goto again; | |
146 | } | |
147 | } else if(state == 1) { | |
148 | if(c == ':') { | |
149 | trim(&buf); | |
150 | bufadd(buf, 0); | |
151 | bufadd(hbuf, buf.b); | |
152 | bufinit(buf); | |
153 | state = 2; | |
154 | } else if(c == '\r') { | |
155 | } else if(c == '\n') { | |
156 | goto fail; | |
157 | } else if(c == EOF) { | |
158 | goto fail; | |
159 | } else { | |
160 | bufadd(buf, c); | |
161 | } | |
162 | } else if(state == 2) { | |
163 | if(c == '\r') { | |
164 | } else if(c == '\n') { | |
165 | trim(&buf); | |
166 | bufadd(buf, 0); | |
167 | bufadd(hbuf, buf.b); | |
168 | bufinit(buf); | |
169 | state = 0; | |
170 | } else if(c == EOF) { | |
171 | goto fail; | |
172 | } else { | |
173 | bufadd(buf, c); | |
174 | } | |
175 | } | |
176 | } | |
177 | bufadd(hbuf, NULL); | |
178 | return(hbuf.b); | |
179 | ||
180 | fail: | |
181 | buffree(hbuf); | |
182 | buffree(buf); | |
183 | return(NULL); | |
184 | } | |
185 | ||
186 | static void sendstatus(char **headers, FILE *out) | |
187 | { | |
188 | char **hp; | |
189 | char *status, *location; | |
190 | ||
191 | hp = headers; | |
192 | status = location = NULL; | |
193 | while(*hp) { | |
194 | if(!strcasecmp(hp[0], "status")) { | |
195 | status = hp[1]; | |
196 | /* Clear this header, so that it is not transmitted by sendheaders. */ | |
197 | **hp = 0; | |
198 | } else if(!strcasecmp(hp[0], "location")) { | |
199 | location = hp[1]; | |
200 | } else { | |
201 | hp += 2; | |
202 | } | |
203 | } | |
204 | if(status) { | |
205 | fprintf(out, "HTTP/1.1 %s\r\n", status); | |
206 | } else if(location) { | |
207 | fprintf(out, "HTTP/1.1 303 See Other\r\n"); | |
208 | } else { | |
209 | fprintf(out, "HTTP/1.1 200 OK\r\n"); | |
210 | } | |
211 | } | |
212 | ||
213 | static void sendheaders(char **headers, FILE *out) | |
214 | { | |
215 | while(*headers) { | |
216 | if(**headers) | |
217 | fprintf(out, "%s: %s\r\n", headers[0], headers[1]); | |
218 | headers += 2; | |
219 | } | |
220 | } | |
221 | ||
222 | int main(int argc, char **argv, char **envp) | |
223 | { | |
224 | char *file; | |
225 | int in, out; | |
226 | FILE *ins, *outs; | |
227 | char **headers; | |
228 | ||
229 | environ = envp; | |
230 | signal(SIGPIPE, SIG_IGN); | |
231 | if(argc < 5) { | |
232 | flog(LOG_ERR, "usage: callcgi PROGRAM METHOD URL REST"); | |
233 | exit(1); | |
234 | } | |
235 | if((file = getenv("REQ_X_ASH_FILE")) == NULL) { | |
236 | flog(LOG_ERR, "callcgi: needs to be called with the X-Ash-File header"); | |
237 | exit(1); | |
238 | } | |
239 | forkchild(argv[1], file, argv[2], argv[3], argv[4], &in, &out); | |
240 | ins = fdopen(in, "w"); | |
241 | passdata(stdin, ins); | |
242 | fclose(ins); | |
243 | outs = fdopen(out, "r"); | |
244 | if((headers = parseheaders(outs)) == NULL) { | |
245 | flog(LOG_WARNING, "CGI handler returned invalid headers"); | |
246 | exit(1); | |
247 | } | |
248 | sendstatus(headers, stdout); | |
249 | sendheaders(headers, stdout); | |
250 | printf("\r\n"); | |
251 | passdata(outs, stdout); | |
252 | return(0); | |
253 | } |