[ashd.git] / src / dirplex / dirplex.c

/*
    ashd - A Sane HTTP Daemon
    Copyright (C) 2008  Fredrik Tolf <fredrik@dolda2000.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <time.h>
#include <sys/signal.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <utils.h>
#include <log.h>
#include <req.h>
#include <proc.h>
#include <resp.h>
#include <cf.h>

#include "dirplex.h"

time_t now;

static void handle(struct hthead *req, int fd, char *path, struct pattern *pat)
{
    struct child *ch;

    headappheader(req, "X-Ash-File", path);
    if(pat->fchild) {
	stdforkserve(pat->fchild, req, fd, NULL, NULL);
    } else {
	if((ch = findchild(path, pat->childnm)) == NULL) {
	    flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm);
	    simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm);
	    return;
	}
	if(childhandle(ch, req, fd, NULL, NULL))
	    simpleerror(fd, 500, "Server Error", "The request handler crashed.");
    }
}

static void handlefile(struct hthead *req, int fd, char *path)
{
    struct pattern *pat;

    if((pat = findmatch(path, 0, 0)) == NULL) {
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	return;
    }
    handle(req, fd, path, pat);
}

static char *findfile(char *path, char *name, struct stat *sb)
{
    DIR *dir;
    struct stat sbuf;
    struct dirent *dent;
    char *p, *fp, *ret;
    
    if(sb == NULL)
	sb = &sbuf;
    if((dir = opendir(path)) == NULL)
	return(NULL);
    ret = NULL;
    while((dent = readdir(dir)) != NULL) {
	/* Ignore backup files.
	 * XXX: There is probably a better and more extensible way to
	 * do this. */
	if(dent->d_name[strlen(dent->d_name) - 1] == '~')
	    continue;
	if((p = strchr(dent->d_name, '.')) == NULL)
	    continue;
	if(p - dent->d_name != strlen(name))
	    continue;
	if(strncmp(dent->d_name, name, strlen(name)))
	    continue;
	fp = sprintf3("%s/%s", path, dent->d_name);
	if(stat(fp, sb))
	    continue;
	if(!S_ISREG(sb->st_mode))
	    continue;
	ret = sstrdup(fp);
	break;
    }
    closedir(dir);
    return(ret);
}

static void handledir(struct hthead *req, int fd, char *path)
{
    struct config **cfs;
    int i, o;
    struct stat sb;
    char *inm, *ipath, *cpath;
    struct pattern *pat;
    
    cpath = sprintf2("%s/", path);
    cfs = getconfigs(cpath);
    for(i = 0; cfs[i] != NULL; i++) {
	if(cfs[i]->index != NULL) {
	    for(o = 0; cfs[i]->index[o] != NULL; o++) {
		inm = cfs[i]->index[o];
		ipath = sprintf2("%s/%s", path, inm);
		if(!stat(ipath, &sb) && S_ISREG(sb.st_mode)) {
		    handlefile(req, fd, ipath);
		    free(ipath);
		    goto out;
		}
		free(ipath);
		
		if(!strchr(inm, '.') && ((ipath = findfile(path, inm, NULL)) != NULL)) {
		    handlefile(req, fd, ipath);
		    free(ipath);
		    goto out;
		}
	    }
	    break;
	}
    }
    if((pat = findmatch(cpath, 0, 1)) != NULL) {
	handle(req, fd, cpath, pat);
	goto out;
    }
    simpleerror(fd, 403, "Not Authorized", "Will not send listings for this directory.");
    
out:
    free(cpath);
}

static int checkpath(struct hthead *req, int fd, char *path, char *rest);

static int checkentry(struct hthead *req, int fd, char *path, char *rest, char *el)
{
    struct stat sb;
    char *newpath;
    int rv;
    
    if(!el == '.') {
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	return(1);
    }
    if(!stat(sprintf3("%s/%s", path, el), &sb)) {
	if(S_ISDIR(sb.st_mode)) {
	    if(!*rest) {
		stdredir(req, fd, 301, sprintf3("%s/", el));
		return(1);
	    }
	    newpath = sprintf2("%s/%s", path, el);
	    rv = checkpath(req, fd, newpath, rest + 1);
	    free(newpath);
	    return(rv);
	} else if(S_ISREG(sb.st_mode)) {
	    newpath = sprintf2("%s/%s", path, el);
	    replrest(req, rest);
	    handlefile(req, fd, newpath);
	    free(newpath);
	    return(1);
	}
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	return(1);
    }
    if(!strchr(el, '.') && ((newpath = findfile(path, el, NULL)) != NULL)) {
	replrest(req, rest);
	handlefile(req, fd, newpath);
	free(newpath);
	return(1);
    }
    return(0);
}

static int checkpath(struct hthead *req, int fd, char *path, char *rest)
{
    struct config *cf;
    char *p, *el;
    int rv;
    
    el = NULL;
    rv = 0;
    
    if(!strncmp(path, "./", 2))
	path += 2;
    cf = getconfig(path);
    
    if((p = strchr(rest, '/')) == NULL) {
	el = unquoteurl(rest);
	rest = "";
    } else {
	char buf[p - rest + 1];
	memcpy(buf, rest, p - rest);
	buf[p - rest] = 0;
	el = unquoteurl(buf);
	rest = p;
    }
    if(el == NULL) {
	simpleerror(fd, 400, "Bad Request", "The requested URL contains an invalid escape sequence.");
	rv = 1;
	goto out;
    }
    if(strchr(el, '/') || (!*el && *rest)) {
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	rv = 1;
	goto out;
    }
    if(!*el) {
	replrest(req, rest);
	handledir(req, fd, path);
	return(1);
    }
    rv = checkentry(req, fd, path, rest, el);
    
out:
    if(el != NULL)
	free(el);
    return(rv);
}

static void serve(struct hthead *req, int fd)
{
    now = time(NULL);
    if(!checkpath(req, fd, ".", req->rest))
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
}

static void usage(FILE *out)
{
    fprintf(out, "usage: dirplex [-hN] [-c CONFIG] DIR\n");
}

int main(int argc, char **argv)
{
    int c;
    int nodef;
    char *gcf, *lcf, *clcf;
    struct hthead *req;
    int fd;
    
    nodef = 0;
    lcf = NULL;
    while((c = getopt(argc, argv, "hNc:")) >= 0) {
	switch(c) {
	case 'h':
	    usage(stdout);
	    exit(0);
	case 'N':
	    nodef = 1;
	    break;
	case 'c':
	    lcf = optarg;
	    break;
	default:
	    usage(stderr);
	    exit(1);
	}
    }
    if(argc - optind < 1) {
	usage(stderr);
	exit(1);
    }
    if(!nodef) {
	if((gcf = findstdconf("ashd/dirplex.rc")) != NULL) {
	    gconfig = readconfig(gcf);
	    free(gcf);
	}
    }
    if(lcf != NULL) {
	if(strchr(lcf, '/') == NULL) {
	    if((clcf = findstdconf(sprintf3("ashd/%s", lcf))) == NULL) {
		flog(LOG_ERR, "could not find requested configuration `%s'", lcf);
		exit(1);
	    }
	    if((lconfig = readconfig(clcf)) == NULL)
		exit(1);
	    free(clcf);
	} else {
	    if((lconfig = readconfig(lcf)) == NULL)
		exit(1);
	}
    }
    if(chdir(argv[optind])) {
	flog(LOG_ERR, "could not change directory to %s: %s", argv[optind], strerror(errno));
	exit(1);
    }
    signal(SIGCHLD, SIG_IGN);
    while(1) {
	if((fd = recvreq(0, &req)) < 0) {
	    if(errno != 0)
		flog(LOG_ERR, "recvreq: %s", strerror(errno));
	    break;
	}
	serve(req, fd);
	freehthead(req);
	close(fd);
    }
    return(0);
}
Commit	Line	Data
600a1ce7 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 <stdio.h>
	21	#include <string.h>
	22	#include <unistd.h>
	23	#include <errno.h>
	24	#include <sys/stat.h>
	25	#include <ctype.h>
	26	#include <dirent.h>
	27	#include <time.h>
	28	#include <sys/signal.h>
	29
	30	#ifdef HAVE_CONFIG_H
	31	#include <config.h>
	32	#endif
	33	#include <utils.h>
	34	#include <log.h>
	35	#include <req.h>
	36	#include <proc.h>
	37	#include <resp.h>
	38	#include <cf.h>
	39
	40	#include "dirplex.h"
	41
	42	time_t now;
	43
	44	static void handle(struct hthead req, int fd, char path, struct pattern *pat)
	45	{
	46	struct child *ch;
	47
	48	headappheader(req, "X-Ash-File", path);
	49	if(pat->fchild) {
6a7a868e	50	stdforkserve(pat->fchild, req, fd, NULL, NULL);
600a1ce7 FT	51	} else {
	52	if((ch = findchild(path, pat->childnm)) == NULL) {
	53	flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm);
	54	simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm);
	55	return;
	56	}
6a7a868e	57	if(childhandle(ch, req, fd, NULL, NULL))
600a1ce7 FT	58	simpleerror(fd, 500, "Server Error", "The request handler crashed.");
	59	}
	60	}
	61
	62	static void handlefile(struct hthead req, int fd, char path)
	63	{
	64	struct pattern *pat;
	65
	66	if((pat = findmatch(path, 0, 0)) == NULL) {
	67	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	68	return;
	69	}
	70	handle(req, fd, path, pat);
	71	}
	72
	73	static char findfile(char path, char name, struct stat sb)
	74	{
	75	DIR *dir;
	76	struct stat sbuf;
	77	struct dirent *dent;
	78	char p, fp, *ret;
	79
	80	if(sb == NULL)
	81	sb = &sbuf;
	82	if((dir = opendir(path)) == NULL)
	83	return(NULL);
	84	ret = NULL;
	85	while((dent = readdir(dir)) != NULL) {
	86	/* Ignore backup files.
	87	* XXX: There is probably a better and more extensible way to
	88	* do this. */
	89	if(dent->d_name[strlen(dent->d_name) - 1] == '~')
	90	continue;
	91	if((p = strchr(dent->d_name, '.')) == NULL)
	92	continue;
	93	if(p - dent->d_name != strlen(name))
	94	continue;
	95	if(strncmp(dent->d_name, name, strlen(name)))
	96	continue;
	97	fp = sprintf3("%s/%s", path, dent->d_name);
	98	if(stat(fp, sb))
	99	continue;
	100	if(!S_ISREG(sb->st_mode))
	101	continue;
	102	ret = sstrdup(fp);
	103	break;
	104	}
	105	closedir(dir);
	106	return(ret);
	107	}
	108
	109	static void handledir(struct hthead req, int fd, char path)
	110	{
	111	struct config **cfs;
	112	int i, o;
	113	struct stat sb;
	114	char inm, ipath, *cpath;
	115	struct pattern *pat;
	116
	117	cpath = sprintf2("%s/", path);
	118	cfs = getconfigs(cpath);
	119	for(i = 0; cfs[i] != NULL; i++) {
	120	if(cfs[i]->index != NULL) {
	121	for(o = 0; cfs[i]->index[o] != NULL; o++) {
122	inm = cfs[i]->index[o];
123	ipath = sprintf2("%s/%s", path, inm);
124	if(!stat(ipath, &sb) && S_ISREG(sb.st_mode)) {
125	handlefile(req, fd, ipath);
126	free(ipath);
127	goto out;
128	}
129	free(ipath);
130
131	if(!strchr(inm, '.') && ((ipath = findfile(path, inm, NULL)) != NULL)) {
132	handlefile(req, fd, ipath);
133	free(ipath);
134	goto out;
135	}
136	}
137	break;
138	}
139	}
140	if((pat = findmatch(cpath, 0, 1)) != NULL) {
141	handle(req, fd, cpath, pat);
142	goto out;
143	}
144	simpleerror(fd, 403, "Not Authorized", "Will not send listings for this directory.");
145
146	out:
147	free(cpath);
148	}
149
150	static int checkpath(struct hthead req, int fd, char path, char *rest);
151
152	static int checkentry(struct hthead req, int fd, char path, char rest, char el)
153	{
154	struct stat sb;
155	char *newpath;
156	int rv;
157
158	if(!el == '.') {
159	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
160	return(1);
161	}
162	if(!stat(sprintf3("%s/%s", path, el), &sb)) {
163	if(S_ISDIR(sb.st_mode)) {
164	if(!*rest) {
165	stdredir(req, fd, 301, sprintf3("%s/", el));
166	return(1);
167	}
168	newpath = sprintf2("%s/%s", path, el);
169	rv = checkpath(req, fd, newpath, rest + 1);
170	free(newpath);
171	return(rv);
172	} else if(S_ISREG(sb.st_mode)) {
173	newpath = sprintf2("%s/%s", path, el);
174	replrest(req, rest);
175	handlefile(req, fd, newpath);
176	free(newpath);
177	return(1);
178	}
179	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
180	return(1);
181	}
182	if(!strchr(el, '.') && ((newpath = findfile(path, el, NULL)) != NULL)) {
183	replrest(req, rest);
184	handlefile(req, fd, newpath);
185	free(newpath);
186	return(1);
187	}
188	return(0);
189	}
190
191	static int checkpath(struct hthead req, int fd, char path, char *rest)
192	{
193	struct config *cf;
194	char p, el;
195	int rv;
196
197	el = NULL;
198	rv = 0;
199
200	if(!strncmp(path, "./", 2))
201	path += 2;
202	cf = getconfig(path);
203
204	if((p = strchr(rest, '/')) == NULL) {
205	el = unquoteurl(rest);
206	rest = "";
207	} else {
208	char buf[p - rest + 1];
209	memcpy(buf, rest, p - rest);
210	buf[p - rest] = 0;
211	el = unquoteurl(buf);
212	rest = p;
213	}
214	if(el == NULL) {
215	simpleerror(fd, 400, "Bad Request", "The requested URL contains an invalid escape sequence.");
216	rv = 1;
217	goto out;
218	}
219	if(strchr(el, '/') \|\| (!el && rest)) {
220	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
221	rv = 1;
222	goto out;
223	}
224	if(!*el) {
225	replrest(req, rest);
226	handledir(req, fd, path);
227	return(1);
228	}
229	rv = checkentry(req, fd, path, rest, el);
230
231	out:
232	if(el != NULL)
233	free(el);
234	return(rv);
235	}
236
237	static void serve(struct hthead *req, int fd)
238	{
239	now = time(NULL);
240	if(!checkpath(req, fd, ".", req->rest))
241	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
242	}
243
244	static void usage(FILE *out)
245	{
246	fprintf(out, "usage: dirplex [-hN] [-c CONFIG] DIR\n");
247	}
248
249	int main(int argc, char **argv)
250	{
251	int c;
252	int nodef;
253	char gcf, lcf, *clcf;
254	struct hthead *req;
255	int fd;
256
257	nodef = 0;
258	lcf = NULL;
259	while((c = getopt(argc, argv, "hNc:")) >= 0) {
260	switch(c) {
261	case 'h':
262	usage(stdout);
263	exit(0);
264	case 'N':
265	nodef = 1;
266	break;
267	case 'c':
268	lcf = optarg;
269	break;
270	default:
271	usage(stderr);
272	exit(1);
273	}
274	}
275	if(argc - optind < 1) {
276	usage(stderr);
277	exit(1);
278	}
279	if(!nodef) {
280	if((gcf = findstdconf("ashd/dirplex.rc")) != NULL) {
281	gconfig = readconfig(gcf);
282	free(gcf);
283	}
284	}
285	if(lcf != NULL) {
286	if(strchr(lcf, '/') == NULL) {
287	if((clcf = findstdconf(sprintf3("ashd/%s", lcf))) == NULL) {
288	flog(LOG_ERR, "could not find requested configuration `%s'", lcf);
289	exit(1);
290	}
291	if((lconfig = readconfig(clcf)) == NULL)
292	exit(1);
293	free(clcf);
294	} else {
295	if((lconfig = readconfig(lcf)) == NULL)
296	exit(1);
297	}
298	}
299	if(chdir(argv[optind])) {
300	flog(LOG_ERR, "could not change directory to %s: %s", argv[optind], strerror(errno));
301	exit(1);
302	}
303	signal(SIGCHLD, SIG_IGN);
304	while(1) {
305	if((fd = recvreq(0, &req)) < 0) {
306	if(errno != 0)
307	flog(LOG_ERR, "recvreq: %s", strerror(errno));
308	break;
309	}
310	serve(req, fd);
311	freehthead(req);
312	close(fd);
313	}
314	return(0);
315	}