| 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 <stdio.h> |
| 21 | #include <unistd.h> |
| 22 | #include <string.h> |
| 23 | #include <ctype.h> |
| 24 | #include <glob.h> |
| 25 | #include <libgen.h> |
| 26 | #include <errno.h> |
| 27 | |
| 28 | #ifdef HAVE_CONFIG_H |
| 29 | #include <config.h> |
| 30 | #endif |
| 31 | #include <utils.h> |
| 32 | #include <cf.h> |
| 33 | #include <mt.h> |
| 34 | #include <proc.h> |
| 35 | #include <log.h> |
| 36 | |
| 37 | #define CH_SOCKET 0 |
| 38 | #define CH_FORK 1 |
| 39 | |
| 40 | static int parsefile(struct cfstate *s, FILE *in); |
| 41 | |
| 42 | static int doinclude(struct cfstate *s, char *spec) |
| 43 | { |
| 44 | int rv, i; |
| 45 | FILE *inc; |
| 46 | glob_t globm; |
| 47 | char *fbk, *dir, *fspec; |
| 48 | |
| 49 | rv = 0; |
| 50 | fbk = s->file; |
| 51 | if(spec[0] == '/') { |
| 52 | fspec = spec; |
| 53 | } else { |
| 54 | dir = sstrdup(fbk); |
| 55 | fspec = sprintf3("%s/%s", dirname(dir), spec); |
| 56 | free(dir); |
| 57 | } |
| 58 | if(glob(fspec, 0, NULL, &globm)) |
| 59 | return(0); |
| 60 | for(i = 0; i < globm.gl_pathc; i++) { |
| 61 | if((inc = fopen(globm.gl_pathv[i], "r")) != NULL) { |
| 62 | s->file = globm.gl_pathv[i]; |
| 63 | if(parsefile(s, inc)) { |
| 64 | fclose(inc); |
| 65 | rv = 1; |
| 66 | goto out; |
| 67 | } |
| 68 | fclose(inc); |
| 69 | inc = NULL; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | out: |
| 74 | globfree(&globm); |
| 75 | s->file = fbk; |
| 76 | return(rv); |
| 77 | } |
| 78 | |
| 79 | static int parsefile(struct cfstate *s, FILE *in) |
| 80 | { |
| 81 | int i; |
| 82 | char line[1024]; |
| 83 | int eof, argc; |
| 84 | int ind, indst[80], indl; |
| 85 | char *p, **w; |
| 86 | |
| 87 | s->lno = 0; |
| 88 | indst[indl = 0] = 0; |
| 89 | eof = 0; |
| 90 | while(1) { |
| 91 | if(fgets(line, sizeof(line), in) == NULL) { |
| 92 | eof = 1; |
| 93 | line[0] = 0; |
| 94 | } |
| 95 | s->lno++; |
| 96 | if(line[0]) { |
| 97 | for(p = line + strlen(line) - 1; p >= line; p--) { |
| 98 | if(isspace(*p)) |
| 99 | *p = 0; |
| 100 | else |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | for(ind = 0, p = line; *p; p++) { |
| 105 | if(*p == ' ') { |
| 106 | ind++; |
| 107 | } else if(*p == '\t') { |
| 108 | ind = ind - (ind % 8) + 8; |
| 109 | } else { |
| 110 | break; |
| 111 | } |
| 112 | } |
| 113 | if(!eof && (!*p || (*p == '#'))) |
| 114 | continue; |
| 115 | |
| 116 | reindent: |
| 117 | if(ind > indst[indl]) { |
| 118 | indst[++indl] = ind; |
| 119 | if(!s->expstart) { |
| 120 | s->res = tokenize("start"); |
| 121 | if(yield()) |
| 122 | return(1); |
| 123 | } else { |
| 124 | s->expstart = 0; |
| 125 | } |
| 126 | } else { |
| 127 | if(s->expstart) { |
| 128 | s->res = tokenize("end"); |
| 129 | if(yield()) |
| 130 | return(1); |
| 131 | s->expstart = 0; |
| 132 | } |
| 133 | while(ind < indst[indl]) { |
| 134 | indl--; |
| 135 | s->res = tokenize("end"); |
| 136 | if(yield()) |
| 137 | return(1); |
| 138 | } |
| 139 | if(ind > indst[indl]) { |
| 140 | flog(LOG_WARNING, "%s:%i: unexpected indentation level", s->file, s->lno); |
| 141 | goto reindent; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | if(eof) |
| 146 | return(0); |
| 147 | |
| 148 | argc = calen(w = tokenize(line)); |
| 149 | if(argc < 1) { |
| 150 | /* Shouldn't happen, but... */ |
| 151 | freeca(w); |
| 152 | continue; |
| 153 | } |
| 154 | |
| 155 | if(indl == 0) { |
| 156 | if(!strcmp(w[0], "include")) { |
| 157 | for(i = 1; i < argc; i++) { |
| 158 | if(doinclude(s, w[i])) { |
| 159 | freeca(w); |
| 160 | return(1); |
| 161 | } |
| 162 | } |
| 163 | freeca(w); |
| 164 | continue; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | if(!strcmp(w[0], "start") || |
| 169 | !strcmp(w[0], "end") || |
| 170 | !strcmp(w[0], "eof")) { |
| 171 | flog(LOG_WARNING, "%s:%i: illegal directive: %s", s->file, s->lno, w[0]); |
| 172 | } else { |
| 173 | s->res = w; |
| 174 | if(yield()) |
| 175 | return(1); |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | static void parsefn(struct muth *mt, va_list args) |
| 181 | { |
| 182 | vavar(struct cfstate *, s); |
| 183 | vavar(FILE *, in); |
| 184 | vavar(char *, file); |
| 185 | |
| 186 | s->file = sstrdup(file); |
| 187 | if(parsefile(s, in)) |
| 188 | goto out; |
| 189 | do { |
| 190 | s->res = tokenize("eof"); |
| 191 | } while(!yield()); |
| 192 | |
| 193 | out: |
| 194 | free(s->file); |
| 195 | } |
| 196 | |
| 197 | char **getcfline(struct cfstate *s) |
| 198 | { |
| 199 | freeca(s->argv); |
| 200 | if(s->res == NULL) |
| 201 | resume(s->pf, 0); |
| 202 | s->argc = calen(s->argv = s->res); |
| 203 | s->res = NULL; |
| 204 | return(s->argv); |
| 205 | } |
| 206 | |
| 207 | struct cfstate *mkcfparser(FILE *in, char *name) |
| 208 | { |
| 209 | struct cfstate *s; |
| 210 | |
| 211 | omalloc(s); |
| 212 | s->pf = mustart(parsefn, s, in, name); |
| 213 | return(s); |
| 214 | } |
| 215 | |
| 216 | void freecfparser(struct cfstate *s) |
| 217 | { |
| 218 | resume(s->pf, -1); |
| 219 | freeca(s->argv); |
| 220 | freeca(s->res); |
| 221 | free(s); |
| 222 | } |
| 223 | |
| 224 | char *findstdconf(char *name) |
| 225 | { |
| 226 | char *path, *p, *p2, *t; |
| 227 | |
| 228 | if((path = getenv("PATH")) == NULL) |
| 229 | return(NULL); |
| 230 | path = sstrdup(path); |
| 231 | for(p = strtok(path, ":"); p != NULL; p = strtok(NULL, ":")) { |
| 232 | if((p2 = strrchr(p, '/')) == NULL) |
| 233 | continue; |
| 234 | *p2 = 0; |
| 235 | if(!access(t = sprintf2("%s/etc/%s", p, name), R_OK)) { |
| 236 | free(path); |
| 237 | return(t); |
| 238 | } |
| 239 | free(t); |
| 240 | } |
| 241 | free(path); |
| 242 | return(NULL); |
| 243 | } |
| 244 | |
| 245 | static struct child *newchild(char *name, int type) |
| 246 | { |
| 247 | struct child *ch; |
| 248 | |
| 249 | omalloc(ch); |
| 250 | ch->name = sstrdup(name); |
| 251 | ch->type = type; |
| 252 | ch->fd = -1; |
| 253 | return(ch); |
| 254 | } |
| 255 | |
| 256 | void freechild(struct child *ch) |
| 257 | { |
| 258 | if(ch->fd != -1) |
| 259 | close(ch->fd); |
| 260 | if(ch->name != NULL) |
| 261 | free(ch->name); |
| 262 | if(ch->argv != NULL) |
| 263 | freeca(ch->argv); |
| 264 | free(ch); |
| 265 | } |
| 266 | |
| 267 | void skipcfblock(struct cfstate *s) |
| 268 | { |
| 269 | char **w; |
| 270 | |
| 271 | while(1) { |
| 272 | w = getcfline(s); |
| 273 | if(!strcmp(w[0], "end") || !strcmp(w[0], "eof")) |
| 274 | return; |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | struct child *parsechild(struct cfstate *s) |
| 279 | { |
| 280 | struct child *ch; |
| 281 | int i; |
| 282 | int sl; |
| 283 | |
| 284 | sl = s->lno; |
| 285 | if(!strcmp(s->argv[0], "child")) { |
| 286 | s->expstart = 1; |
| 287 | if(s->argc < 2) { |
| 288 | flog(LOG_WARNING, "%s:%i: missing name in child declaration", s->file, s->lno); |
| 289 | skipcfblock(s); |
| 290 | return(NULL); |
| 291 | } |
| 292 | ch = newchild(s->argv[1], CH_SOCKET); |
| 293 | } else if(!strcmp(s->argv[0], "fchild")) { |
| 294 | s->expstart = 1; |
| 295 | if(s->argc < 2) { |
| 296 | flog(LOG_WARNING, "%s:%i: missing name in child declaration", s->file, s->lno); |
| 297 | skipcfblock(s); |
| 298 | return(NULL); |
| 299 | } |
| 300 | ch = newchild(s->argv[1], CH_FORK); |
| 301 | } else { |
| 302 | return(NULL); |
| 303 | } |
| 304 | |
| 305 | while(1) { |
| 306 | getcfline(s); |
| 307 | if(!strcmp(s->argv[0], "exec")) { |
| 308 | if(s->argc < 2) { |
| 309 | flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", s->file, s->lno); |
| 310 | continue; |
| 311 | } |
| 312 | ch->argv = szmalloc(sizeof(*ch->argv) * s->argc); |
| 313 | for(i = 0; i < s->argc - 1; i++) |
| 314 | ch->argv[i] = sstrdup(s->argv[i + 1]); |
| 315 | } else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) { |
| 316 | break; |
| 317 | } else { |
| 318 | flog(LOG_WARNING, "%s:%i: unknown directive `%s' in child declaration", s->file, s->lno, s->argv[0]); |
| 319 | } |
| 320 | } |
| 321 | if(ch->argv == NULL) { |
| 322 | flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", s->file, sl, ch->name); |
| 323 | freechild(ch); |
| 324 | return(NULL); |
| 325 | } |
| 326 | return(ch); |
| 327 | } |
| 328 | |
| 329 | int childhandle(struct child *ch, struct hthead *req, int fd) |
| 330 | { |
| 331 | if(ch->type == CH_SOCKET) { |
| 332 | if(ch->fd < 0) |
| 333 | ch->fd = stdmkchild(ch->argv); |
| 334 | if(sendreq(ch->fd, req, fd)) { |
| 335 | if(errno == EPIPE) { |
| 336 | /* Assume that the child has crashed and restart it. */ |
| 337 | close(ch->fd); |
| 338 | ch->fd = stdmkchild(ch->argv); |
| 339 | if(!sendreq(ch->fd, req, fd)) |
| 340 | return(0); |
| 341 | } |
| 342 | flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno)); |
| 343 | close(ch->fd); |
| 344 | ch->fd = -1; |
| 345 | return(-1); |
| 346 | } |
| 347 | } else if(ch->type == CH_FORK) { |
| 348 | if(stdforkserve(ch->argv, req, fd) < 0) |
| 349 | return(-1); |
| 350 | } |
| 351 | return(0); |
| 352 | } |