Added daemonizing, syslogging, setuid and chrooting to htparser.
[ashd.git] / src / sendfile.c
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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 <fcntl.h>
24#include <errno.h>
25#include <sys/stat.h>
26#include <stdint.h>
b4164ce6 27#include <time.h>
8f728a25 28#include <magic.h>
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29
30#ifdef HAVE_CONFIG_H
31#include <config.h>
32#endif
33#include <utils.h>
34#include <log.h>
35#include <resp.h>
36
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37#ifdef HAVE_XATTR
38#include <attr/xattr.h>
39#endif
40
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41static magic_t cookie = NULL;
42
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43static void passdata(int in, int out)
44{
45 int ret, len, off;
46 char *buf;
47
48 buf = smalloc(65536);
49 while(1) {
50 len = read(in, buf, 65536);
51 if(len < 0) {
52 flog(LOG_ERR, "sendfile: could not read input: %s", strerror(errno));
53 break;
54 }
55 if(len == 0)
56 break;
57 for(off = 0; off < len; off += ret) {
58 ret = write(out, buf + off, len - off);
59 if(ret < 0) {
60 flog(LOG_ERR, "sendfile: could not write output: %s", strerror(errno));
61 break;
62 }
63 }
64 }
65 free(buf);
66}
67
68static int strrcmp(char *str, char *end)
69{
70 return(strcmp(str + strlen(str) - strlen(end), end));
71}
72
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73static char *attrmimetype(char *file)
74{
75#ifdef HAVE_XATTR
76 static char buf[1024];
77 int i;
78 ssize_t sz;
79
80 if((sz = getxattr(file, "user.ash-mime-type", buf, sizeof(buf) - 1)) > 0)
81 goto found;
82 if((sz = getxattr(file, "user.mime-type", buf, sizeof(buf) - 1)) > 0)
83 goto found;
84 if((sz = getxattr(file, "user.mime_type", buf, sizeof(buf) - 1)) > 0)
85 goto found;
86 if((sz = getxattr(file, "user.Content-Type", buf, sizeof(buf) - 1)) > 0)
87 goto found;
88 return(NULL);
89found:
90 for(i = 0; i < sz; i++) {
91 if((buf[sz] < 32) || (buf[sz] >= 128))
92 return(NULL);
93 }
94 buf[sz] = 0;
95 return(buf);
96#else
97 return(NULL);
98#endif
99}
100
8f728a25 101static const char *getmimetype(char *file, struct stat *sb)
01b2ebce 102{
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103 const char *ret;
104
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105 if((ret = attrmimetype(file)) != NULL)
106 return(ret);
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107 if(cookie == NULL) {
108 cookie = magic_open(MAGIC_MIME_TYPE);
109 magic_load(cookie, NULL);
110 }
111 if((ret = magic_file(cookie, file)) != NULL)
112 return(ret);
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113 return("application/octet-stream");
114}
115
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116static void checkcache(char *file, struct stat *sb)
117{
118 char *hdr;
119
120 if((hdr = getenv("REQ_IF_MODIFIED_SINCE")) != NULL) {
121 if(parsehttpdate(hdr) < sb->st_mtime)
122 return;
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123 printf("HTTP/1.1 304 Not Modified\n");
124 printf("Date: %s\n", fmthttpdate(time(NULL)));
125 printf("Content-Length: 0\n");
126 printf("\n");
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127 exit(0);
128 }
129}
130
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131static void usage(void)
132{
133 flog(LOG_ERR, "usage: sendfile [-c CONTENT-TYPE] METHOD URL REST");
134}
135
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136int main(int argc, char **argv)
137{
289c63fc 138 int c;
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139 char *file;
140 struct stat sb;
141 int fd;
8f728a25 142 const char *contype;
01b2ebce 143
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144 contype = NULL;
145 while((c = getopt(argc, argv, "c:")) >= 0) {
146 switch(c) {
147 case 'c':
148 contype = optarg;
149 break;
150 default:
151 usage();
152 exit(1);
153 break;
154 }
155 }
156 if(argc - optind < 3) {
157 usage();
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158 exit(1);
159 }
160 if((file = getenv("REQ_X_ASH_FILE")) == NULL) {
161 flog(LOG_ERR, "sendfile: needs to be called with the X-Ash-File header");
162 exit(1);
163 }
289c63fc 164 if(*argv[optind + 2]) {
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165 simpleerror(1, 404, "Not Found", "The requested URL has no corresponding resource.");
166 exit(0);
167 }
168 if(stat(file, &sb) || ((fd = open(file, O_RDONLY)) < 0)) {
169 flog(LOG_ERR, "sendfile: could not stat input file %s: %s", file, strerror(errno));
170 simpleerror(1, 500, "Internal Error", "The server could not access its own data.");
171 exit(1);
172 }
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173 if(contype == NULL)
174 contype = getmimetype(file, &sb);
01b2ebce 175
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176 checkcache(file, &sb);
177
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178 printf("HTTP/1.1 200 OK\n");
179 printf("Content-Type: %s\n", contype);
180 printf("Content-Length: %ji\n", (intmax_t)sb.st_size);
181 printf("Last-Modified: %s\n", fmthttpdate(sb.st_mtime));
182 printf("Date: %s\n", fmthttpdate(time(NULL)));
183 printf("\n");
01b2ebce 184 fflush(stdout);
289c63fc 185 if(strcasecmp(argv[optind], "head"))
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186 passdata(fd, 1);
187 return(0);
188}