| 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> |
| 27 | #include <time.h> |
| 28 | #include <magic.h> |
| 29 | #include <locale.h> |
| 30 | #include <langinfo.h> |
| 31 | #include <sys/socket.h> |
| 32 | |
| 33 | #ifdef HAVE_CONFIG_H |
| 34 | #include <config.h> |
| 35 | #endif |
| 36 | #include <utils.h> |
| 37 | #include <log.h> |
| 38 | #include <req.h> |
| 39 | #include <resp.h> |
| 40 | #include <mt.h> |
| 41 | #include <mtio.h> |
| 42 | |
| 43 | #ifdef HAVE_XATTR |
| 44 | #include <attr/xattr.h> |
| 45 | #endif |
| 46 | |
| 47 | static magic_t cookie; |
| 48 | |
| 49 | static char *attrmimetype(char *file) |
| 50 | { |
| 51 | #ifdef HAVE_XATTR |
| 52 | char buf[1024]; |
| 53 | int i; |
| 54 | ssize_t sz; |
| 55 | |
| 56 | if((sz = getxattr(file, "user.ash-mime-type", buf, sizeof(buf) - 1)) > 0) |
| 57 | goto found; |
| 58 | if((sz = getxattr(file, "user.mime-type", buf, sizeof(buf) - 1)) > 0) |
| 59 | goto found; |
| 60 | if((sz = getxattr(file, "user.mime_type", buf, sizeof(buf) - 1)) > 0) |
| 61 | goto found; |
| 62 | if((sz = getxattr(file, "user.Content-Type", buf, sizeof(buf) - 1)) > 0) |
| 63 | goto found; |
| 64 | return(NULL); |
| 65 | found: |
| 66 | for(i = 0; i < sz; i++) { |
| 67 | if((buf[i] < 32) || (buf[i] >= 128)) |
| 68 | return(NULL); |
| 69 | } |
| 70 | buf[sz] = 0; |
| 71 | return(sstrdup(buf)); |
| 72 | #else |
| 73 | return(NULL); |
| 74 | #endif |
| 75 | } |
| 76 | |
| 77 | static char *getmimetype(char *file, struct stat *sb) |
| 78 | { |
| 79 | char *ret; |
| 80 | const char *cret; |
| 81 | |
| 82 | if((ret = attrmimetype(file)) != NULL) |
| 83 | return(ret); |
| 84 | if((cret = magic_file(cookie, file)) != NULL) |
| 85 | return(sstrdup(cret)); |
| 86 | return(sstrdup("application/octet-stream")); |
| 87 | } |
| 88 | |
| 89 | /* XXX: This could be made far better and check for other attributes |
| 90 | * and stuff, but not now. */ |
| 91 | static char *ckctype(char *ctype) |
| 92 | { |
| 93 | char *buf; |
| 94 | |
| 95 | if(!strncmp(ctype, "text/", 5) && (strchr(ctype, ';') == NULL)) { |
| 96 | buf = sprintf2("%s; charset=%s", ctype, nl_langinfo(CODESET)); |
| 97 | free(ctype); |
| 98 | return(buf); |
| 99 | } |
| 100 | return(ctype); |
| 101 | } |
| 102 | |
| 103 | static int checkcache(struct hthead *req, FILE *out, char *file, struct stat *sb) |
| 104 | { |
| 105 | char *hdr; |
| 106 | |
| 107 | if((hdr = getheader(req, "If-Modified-Since")) != NULL) { |
| 108 | if(parsehttpdate(hdr) < sb->st_mtime) |
| 109 | return(0); |
| 110 | fprintf(out, "HTTP/1.1 304 Not Modified\n"); |
| 111 | fprintf(out, "Date: %s\n", fmthttpdate(time(NULL))); |
| 112 | fprintf(out, "Content-Length: 0\n"); |
| 113 | fprintf(out, "\n"); |
| 114 | return(1); |
| 115 | } |
| 116 | return(0); |
| 117 | } |
| 118 | |
| 119 | static off_t passdata(FILE *in, FILE *out, off_t max) |
| 120 | { |
| 121 | size_t read; |
| 122 | off_t total; |
| 123 | char buf[8192]; |
| 124 | |
| 125 | total = 0; |
| 126 | while(!feof(in) && ((max < 0) || (total < max))) { |
| 127 | read = sizeof(buf); |
| 128 | if(max >= 0) |
| 129 | read = min(max - total, read); |
| 130 | read = fread(buf, 1, read, in); |
| 131 | if(ferror(in)) |
| 132 | return(-1); |
| 133 | if(fwrite(buf, 1, read, out) != read) |
| 134 | return(-1); |
| 135 | total += read; |
| 136 | } |
| 137 | return(total); |
| 138 | } |
| 139 | |
| 140 | static void sendwhole(struct hthead *req, FILE *out, FILE *sfile, struct stat *sb, char *contype, int head) |
| 141 | { |
| 142 | fprintf(out, "HTTP/1.1 200 OK\n"); |
| 143 | fprintf(out, "Content-Type: %s\n", contype); |
| 144 | fprintf(out, "Content-Length: %ji\n", (intmax_t)sb->st_size); |
| 145 | fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime)); |
| 146 | fprintf(out, "Date: %s\n", fmthttpdate(time(NULL))); |
| 147 | fprintf(out, "\n"); |
| 148 | if(!head) |
| 149 | passdata(sfile, out, -1); |
| 150 | } |
| 151 | |
| 152 | static void sendrange(struct hthead *req, FILE *out, FILE *sfile, struct stat *sb, char *contype, char *spec, int head) |
| 153 | { |
| 154 | char buf[strlen(spec) + 1]; |
| 155 | char *p, *e; |
| 156 | off_t start, end; |
| 157 | |
| 158 | if(strncmp(spec, "bytes=", 6)) |
| 159 | goto error; |
| 160 | strcpy(buf, spec + 6); |
| 161 | if((p = strchr(buf, '-')) == NULL) |
| 162 | goto error; |
| 163 | if(p == buf) { |
| 164 | if(!p[1]) |
| 165 | goto error; |
| 166 | end = sb->st_size; |
| 167 | start = end - strtoll(p + 1, &e, 10); |
| 168 | if(*e) |
| 169 | goto error; |
| 170 | if(start < 0) |
| 171 | start = 0; |
| 172 | } else { |
| 173 | *(p++) = 0; |
| 174 | start = strtoll(buf, &e, 10); |
| 175 | if(*e) |
| 176 | goto error; |
| 177 | if(*p) { |
| 178 | end = strtoll(p, &e, 10) + 1; |
| 179 | if(*e) |
| 180 | goto error; |
| 181 | } else { |
| 182 | end = sb->st_size; |
| 183 | } |
| 184 | } |
| 185 | if(start >= sb->st_size) { |
| 186 | fprintf(out, "HTTP/1.1 416 Not satisfiable\n"); |
| 187 | fprintf(out, "Content-Range: */%ji\n", (intmax_t)sb->st_size); |
| 188 | fprintf(out, "Content-Length: 0\n"); |
| 189 | fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime)); |
| 190 | fprintf(out, "Date: %s\n", fmthttpdate(time(NULL))); |
| 191 | fprintf(out, "\n"); |
| 192 | return; |
| 193 | } |
| 194 | if((start < 0) || (start >= end)) |
| 195 | goto error; |
| 196 | if(end > sb->st_size) |
| 197 | end = sb->st_size; |
| 198 | errno = 0; |
| 199 | if(fseeko(sfile, start, SEEK_SET)) { |
| 200 | simpleerror2(out, 500, "Internal Error", "Could not seek properly to beginning of requested byte range."); |
| 201 | flog(LOG_ERR, "sendfile: could not seek properly when serving partial content: %s", strerror(errno)); |
| 202 | return; |
| 203 | } |
| 204 | fprintf(out, "HTTP/1.1 206 Partial content\n"); |
| 205 | fprintf(out, "Content-Range: bytes %ji-%ji/%ji\n", (intmax_t)start, (intmax_t)(end - 1), (intmax_t)sb->st_size); |
| 206 | fprintf(out, "Content-Length: %ji\n", (intmax_t)(end - start)); |
| 207 | fprintf(out, "Content-Type: %s\n", contype); |
| 208 | fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime)); |
| 209 | fprintf(out, "Date: %s\n", fmthttpdate(time(NULL))); |
| 210 | fprintf(out, "\n"); |
| 211 | if(!head) |
| 212 | passdata(sfile, out, end - start); |
| 213 | return; |
| 214 | |
| 215 | error: |
| 216 | sendwhole(req, out, sfile, sb, contype, head); |
| 217 | } |
| 218 | |
| 219 | static void serve(struct muth *muth, va_list args) |
| 220 | { |
| 221 | vavar(struct hthead *, req); |
| 222 | vavar(int, fd); |
| 223 | FILE *out, *sfile; |
| 224 | int ishead; |
| 225 | char *file, *contype, *hdr; |
| 226 | struct stat sb; |
| 227 | |
| 228 | sfile = NULL; |
| 229 | contype = NULL; |
| 230 | out = mtstdopen(fd, 1, 60, "r+", NULL); |
| 231 | |
| 232 | if((file = getheader(req, "X-Ash-File")) == NULL) { |
| 233 | flog(LOG_ERR, "psendfile: needs to be called with the X-Ash-File header"); |
| 234 | simpleerror2(out, 500, "Internal Error", "The server is incorrectly configured."); |
| 235 | goto out; |
| 236 | } |
| 237 | if(*req->rest) { |
| 238 | simpleerror2(out, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 239 | goto out; |
| 240 | } |
| 241 | if(((sfile = fopen(file, "r")) == NULL) || fstat(fileno(sfile), &sb)) { |
| 242 | flog(LOG_ERR, "psendfile: could not stat input file %s: %s", file, strerror(errno)); |
| 243 | simpleerror2(out, 500, "Internal Error", "The server could not access its own data."); |
| 244 | goto out; |
| 245 | } |
| 246 | if(!strcasecmp(req->method, "get")) { |
| 247 | ishead = 0; |
| 248 | } else if(!strcasecmp(req->method, "head")) { |
| 249 | ishead = 1; |
| 250 | } else { |
| 251 | simpleerror2(out, 405, "Method not allowed", "The requested method is not defined for this resource."); |
| 252 | goto out; |
| 253 | } |
| 254 | if((hdr = getheader(req, "X-Ash-Content-Type")) == NULL) |
| 255 | contype = getmimetype(file, &sb); |
| 256 | else |
| 257 | contype = sstrdup(hdr); |
| 258 | contype = ckctype(contype); |
| 259 | |
| 260 | if(checkcache(req, out, file, &sb)) |
| 261 | goto out; |
| 262 | |
| 263 | if((hdr = getheader(req, "Range")) != NULL) |
| 264 | sendrange(req, out, sfile, &sb, contype, hdr, ishead); |
| 265 | else |
| 266 | sendwhole(req, out, sfile, &sb, contype, ishead); |
| 267 | |
| 268 | out: |
| 269 | if(sfile != NULL) |
| 270 | fclose(sfile); |
| 271 | if(contype != NULL) |
| 272 | free(contype); |
| 273 | fclose(out); |
| 274 | freehthead(req); |
| 275 | } |
| 276 | |
| 277 | static void listenloop(struct muth *muth, va_list args) |
| 278 | { |
| 279 | vavar(int, lfd); |
| 280 | int fd; |
| 281 | struct hthead *req; |
| 282 | |
| 283 | while(1) { |
| 284 | block(lfd, EV_READ, 0); |
| 285 | if((fd = recvreq(lfd, &req)) < 0) { |
| 286 | if(errno != 0) |
| 287 | flog(LOG_ERR, "recvreq: %s", strerror(errno)); |
| 288 | break; |
| 289 | } |
| 290 | mustart(serve, req, fd); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | static void sigterm(int sig) |
| 295 | { |
| 296 | shutdown(0, SHUT_RDWR); |
| 297 | } |
| 298 | |
| 299 | static void usage(FILE *out) |
| 300 | { |
| 301 | fprintf(out, "usage: psendfile [-h]\n"); |
| 302 | } |
| 303 | |
| 304 | int main(int argc, char **argv) |
| 305 | { |
| 306 | int c; |
| 307 | |
| 308 | setlocale(LC_ALL, ""); |
| 309 | while((c = getopt(argc, argv, "h")) >= 0) { |
| 310 | switch(c) { |
| 311 | case 'h': |
| 312 | usage(stdout); |
| 313 | exit(0); |
| 314 | default: |
| 315 | usage(stderr); |
| 316 | exit(1); |
| 317 | } |
| 318 | } |
| 319 | cookie = magic_open(MAGIC_MIME_TYPE | MAGIC_SYMLINK); |
| 320 | magic_load(cookie, NULL); |
| 321 | mustart(listenloop, 0); |
| 322 | signal(SIGINT, sigterm); |
| 323 | signal(SIGTERM, sigterm); |
| 324 | ioloop(); |
| 325 | return(0); |
| 326 | } |