[ashd.git] / src / 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 <fnmatch.h>

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

#define CH_SOCKET 0
#define CH_FORK 1

#define PAT_BASENAME 0
#define PAT_PATHNAME 1
#define PAT_ALL 2
#define PAT_DEFAULT 3

struct config {
    struct config *next, *prev;
    char *path;
    time_t mtime;
    struct child *children;
    struct pattern *patterns;
};

struct rule {
    int type;
    char *pattern;
};

struct pattern {
    struct pattern *next;
    char *childnm;
    struct rule **rules;
};

struct config *cflist;

static void freepattern(struct pattern *pat)
{
    struct rule **rule;
    
    for(rule = pat->rules; *rule; rule++) {
	if((*rule)->pattern != NULL)
	    free((*rule)->pattern);
	free(*rule);
    }
    if(pat->childnm != NULL)
	free(pat->childnm);
    free(pat);
}

static void freeconfig(struct config *cf)
{
    struct child *ch, *nch;
    struct pattern *pat, *npat;
    
    if(cf->prev != NULL)
	cf->prev->next = cf->next;
    if(cf->next != NULL)
	cf->next->prev = cf->prev;
    if(cf == cflist)
	cflist = cf->next;
    free(cf->path);
    for(ch = cf->children; ch != NULL; ch = nch) {
	nch = ch->next;
	freechild(ch);
    }
    for(pat = cf->patterns; pat != NULL; pat = npat) {
	npat = pat->next;
	freepattern(pat);
    }
    free(cf);
}

static struct child *getchild(struct config *cf, char *name)
{
    struct child *ch;
    
    for(ch = cf->children; ch; ch = ch->next) {
	if(!strcmp(ch->name, name))
	    break;
    }
    return(ch);
}

static struct rule *newrule(struct pattern *pat)
{
    int i;
    struct rule *rule;
    
    for(i = 0; pat->rules[i]; i++);
    pat->rules = srealloc(pat->rules, sizeof(*pat->rules) * (i + 2));
    rule = pat->rules[i] = szmalloc(sizeof(*rule));
    pat->rules[i + 1] = NULL;
    return(rule);
}

static struct pattern *newpattern(void)
{
    struct pattern *pat;
    
    omalloc(pat);
    pat->rules = szmalloc(sizeof(*pat->rules));
    return(pat);
}

static struct pattern *parsepattern(struct cfstate *s)
{
    struct pattern *pat;
    struct rule *rule;
    int sl;

    if(!strcmp(s->argv[0], "match")) {
	s->expstart = 1;
	pat = newpattern();
    } else {
	return(NULL);
    }
    
    sl = s->lno;
    while(1) {
	getcfline(s);
	if(!strcmp(s->argv[0], "filename")) {
	    if(s->argc < 2) {
		flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", s->file, s->lno);
		continue;
	    }
	    rule = newrule(pat);
	    rule->type = PAT_BASENAME;
	    rule->pattern = sstrdup(s->argv[1]);
	} else if(!strcmp(s->argv[0], "pathname")) {
	    if(s->argc < 2) {
		flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", s->file, s->lno);
		continue;
	    }
	    rule = newrule(pat);
	    rule->type = PAT_PATHNAME;
	    rule->pattern = sstrdup(s->argv[1]);
	} else if(!strcmp(s->argv[0], "all")) {
	    newrule(pat)->type = PAT_ALL;
	} else if(!strcmp(s->argv[0], "default")) {
	    newrule(pat)->type = PAT_DEFAULT;
	} else if(!strcmp(s->argv[0], "handler")) {
	    if(s->argc < 2) {
		flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno);
		continue;
	    }
	    if(pat->childnm != NULL)
		free(pat->childnm);
	    pat->childnm = sstrdup(s->argv[1]);
	} else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) {
	    break;
	} else {
	    flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]);
	}
    }
    
    if(pat->rules[0] == NULL) {
	flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl);
	freepattern(pat);
	return(NULL);
    }
    if(pat->childnm == NULL) {
	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl);
	freepattern(pat);
	return(NULL);
    }
    return(pat);
}

static struct config *readconfig(char *path)
{
    struct cfstate *s;
    FILE *in;
    struct config *cf;
    struct child *child;
    struct pattern *pat;
    struct stat sb;
    char *p;
    
    p = sprintf3("%s/.htrc", path);
    if(stat(p, &sb))
	return(NULL);
    if((in = fopen(p, "r")) == NULL) {
	flog(LOG_WARNING, "%s: %s", p, strerror(errno));
	return(NULL);
    }
    s = mkcfparser(in, p);
    omalloc(cf);
    cf->mtime = sb.st_mtime;
    cf->path = sstrdup(path);
    
    while(1) {
	getcfline(s);
	if((child = parsechild(s)) != NULL) {
	    child->next = cf->children;
	    cf->children = child;
	} else if((pat = parsepattern(s)) != NULL) {
	    pat->next = cf->patterns;
	    cf->patterns = pat;
	} else if(!strcmp(s->argv[0], "eof")) {
	    break;
	} else {
	    flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]);
	}
    }
    
    freecfparser(s);
    fclose(in);
    return(cf);
}

static struct config *getconfig(char *path)
{
    struct config *cf;
    struct stat sb;
    
    for(cf = cflist; cf != NULL; cf = cf->next) {
	if(!strcmp(cf->path, path)) {
	    if(stat(sprintf3("%s/.htrc", path), &sb))
		return(NULL);
	    if(sb.st_mtime != cf->mtime) {
		freeconfig(cf);
		break;
	    }
	    return(cf);
	}
    }
    if((cf = readconfig(path)) != NULL) {
	cf->next = cflist;
	cflist = cf;
    }
    return(cf);
}

static struct child *findchild(char *file, char *name)
{
    char *buf, *p;
    struct config *cf;
    struct child *ch;

    buf = sstrdup(file);
    while(1) {
	ch = NULL;
	if(!strcmp(buf, "."))
	    break;
	if((p = strrchr(buf, '/')) != NULL)
	    *p = 0;
	else
	    strcpy(buf, ".");
	cf = getconfig(buf);
	if(cf == NULL)
	    continue;
	if((ch = getchild(cf, name)) != NULL)
	    break;
    }
    free(buf);
    return(ch);
}

static struct pattern *findmatch(char *file, int trydefault)
{
    int i;
    char *buf, *p, *bn;
    struct config *cf;
    struct pattern *pat;
    struct rule *rule;
    
    if((bn = strrchr(file, '/')) != NULL)
	bn++;
    else
	bn = file;
    buf = sstrdup(file);
    while(1) {
	pat = NULL;
	if(!strcmp(buf, "."))
	    break;
	if((p = strrchr(buf, '/')) != NULL)
	    *p = 0;
	else
	    strcpy(buf, ".");
	cf = getconfig(buf);
	if(cf == NULL)
	    continue;
	for(pat = cf->patterns; pat != NULL; pat = pat->next) {
	    for(i = 0; (rule = pat->rules[i]) != NULL; i++) {
		if(rule->type == PAT_BASENAME) {
		    if(fnmatch(rule->pattern, bn, 0))
			break;
		} else if(rule->type == PAT_PATHNAME) {
		    if(fnmatch(rule->pattern, file, FNM_PATHNAME))
			break;
		} else if(rule->type == PAT_ALL) {
		} else if(rule->type == PAT_DEFAULT) {
		    if(!trydefault)
			break;
		}
	    }
	    if(!rule)
		goto out;
	}
    }

out:
    free(buf);
    return(pat);
}

static void forkchild(struct child *ch)
{
    ch->fd = stdmkchild(ch->argv);
}

static void passreq(struct child *ch, struct hthead *req, int fd)
{
    if(ch->fd < 0)
	forkchild(ch);
    if(sendreq(ch->fd, req, fd)) {
	if(errno == EPIPE) {
	    /* Assume that the child has crashed and restart it. */
	    forkchild(ch);
	    if(!sendreq(ch->fd, req, fd))
		return;
	}
	flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno));
	close(ch->fd);
	ch->fd = -1;
	simpleerror(fd, 500, "Server Error", "The request handler crashed.");
    }
}

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

    headappheader(req, "X-Ash-File", path);
    if(((pat = findmatch(path, 0)) == NULL) && ((pat = findmatch(path, 1)) == NULL)) {
	/* XXX: Send a 500 error? 404? */
	return;
    }
    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(ch->type == CH_SOCKET) {
	passreq(ch, req, fd);
    } else if(ch->type == CH_FORK) {
	stdforkserve(ch->argv, req, fd);
    }
}

static void handledir(struct hthead *req, int fd, char *path)
{
    /* XXX: Todo */
    simpleerror(fd, 403, "Not Authorized", "Will not send directory listings or indices yet.");
}

static int checkdir(struct hthead *req, int fd, char *path)
{
    return(0);
}

static void serve(struct hthead *req, int fd)
{
    char *p, *p2, *path, *tmp, *buf, *p3, *nm;
    struct stat sb;
    DIR *dir;
    struct dirent *dent;
    
    nm = req->rest;
    path = sstrdup(".");
    p = nm;
    while(1) {
	if((p2 = strchr(p, '/')) == NULL) {
	} else {
	    *(p2++) = 0;
	}
	
	if(!*p) {
	    if(p2 == NULL) {
		if(stat(path, &sb)) {
		    flog(LOG_WARNING, "failed to stat previously stated directory %s: %s", path, strerror(errno));
		    simpleerror(fd, 500, "Internal Server Error", "The server encountered an unexpected condition.");
		    goto fail;
		}
		break;
	    } else {
		simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
		goto fail;
	    }
	}
	if(*p == '.') {
	    simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	    goto fail;
	}
	
	getconfig(path);
	
	/*
	 * First, check the name verbatimely:
	 */
	buf = sprintf3("%s/%s", path, p);
	if(!stat(buf, &sb)) {
	    if(S_ISDIR(sb.st_mode)) {
		tmp = path;
		if(!strcmp(path, "."))
		    path = sstrdup(p);
		else
		    path = sprintf2("%s/%s", path, p);
		free(tmp);
		if(checkdir(req, fd, path))
		    break;
		goto next;
	    }
	    if(S_ISREG(sb.st_mode)) {
		tmp = path;
		path = sprintf2("%s/%s", path, p);
		free(tmp);
		break;
	    }
	    simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	    goto fail;
	}

	/*
	 * Check the file extensionlessly:
	 */
	if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) {
	    while((dent = readdir(dir)) != NULL) {
		buf = sprintf3("%s/%s", path, dent->d_name);
		if((p3 = strchr(dent->d_name, '.')) != NULL)
		    *p3 = 0;
		if(strcmp(dent->d_name, p))
		    continue;
		if(stat(buf, &sb))
		    continue;
		if(!S_ISREG(sb.st_mode))
		    continue;
		tmp = path;
		path = sstrdup(buf);
		free(tmp);
		break;
	    }
	    closedir(dir);
	    if(dent != NULL)
		break;
	}
	
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	goto fail;
	
    next:
	if(p2 == NULL)
	    break;
	p = p2;
    }
    if(p2 == NULL)
	replrest(req, "");
    else
	replrest(req, p2);
    if(!strncmp(path, "./", 2))
	memmove(path, path + 2, strlen(path + 2) + 1);
    if(S_ISDIR(sb.st_mode)) {
	handledir(req, fd, path);
    } else if(S_ISREG(sb.st_mode)) {
	handlefile(req, fd, path);
    } else {
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	goto fail;
    }
    goto out;
    
fail:
    /* No special handling, for now at least. */
out:
    free(path);
}

int main(int argc, char **argv)
{
    struct hthead *req;
    int fd;
    
    if(argc < 2) {
	flog(LOG_ERR, "usage: dirplex DIR");
	exit(1);
    }
    if(chdir(argv[1])) {
	flog(LOG_ERR, "could not change directory to %s: %s", argv[1], 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
992ce9ef 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 <fnmatch.h>
	28
	29	#ifdef HAVE_CONFIG_H
	30	#include <config.h>
	31	#endif
	32	#include <utils.h>
	33	#include <mt.h>
	34	#include <log.h>
	35	#include <req.h>
	36	#include <proc.h>
d422fdfd	37	#include <resp.h>
06c1a718	38	#include <cf.h>
992ce9ef FT	39
	40	#define CH_SOCKET 0
	41	#define CH_FORK 1
	42
	43	#define PAT_BASENAME 0
	44	#define PAT_PATHNAME 1
	45	#define PAT_ALL 2
	46	#define PAT_DEFAULT 3
	47
	48	struct config {
	49	struct config next, prev;
	50	char *path;
	51	time_t mtime;
	52	struct child *children;
	53	struct pattern *patterns;
	54	};
	55
992ce9ef FT	56	struct rule {
	57	int type;
	58	char *pattern;
	59	};
	60
	61	struct pattern {
	62	struct pattern *next;
	63	char *childnm;
	64	struct rule **rules;
	65	};
	66
	67	struct config *cflist;
	68
992ce9ef FT	69	static void freepattern(struct pattern *pat)
	70	{
	71	struct rule **rule;
	72
	73	for(rule = pat->rules; *rule; rule++) {
	74	if((*rule)->pattern != NULL)
	75	free((*rule)->pattern);
	76	free(*rule);
	77	}
	78	if(pat->childnm != NULL)
	79	free(pat->childnm);
	80	free(pat);
	81	}
	82
	83	static void freeconfig(struct config *cf)
	84	{
	85	struct child ch, nch;
	86	struct pattern pat, npat;
	87
	88	if(cf->prev != NULL)
	89	cf->prev->next = cf->next;
	90	if(cf->next != NULL)
	91	cf->next->prev = cf->prev;
	92	if(cf == cflist)
	93	cflist = cf->next;
	94	free(cf->path);
	95	for(ch = cf->children; ch != NULL; ch = nch) {
	96	nch = ch->next;
	97	freechild(ch);
	98	}
	99	for(pat = cf->patterns; pat != NULL; pat = npat) {
	100	npat = pat->next;
	101	freepattern(pat);
	102	}
	103	free(cf);
	104	}
	105
992ce9ef FT	106	static struct child getchild(struct config cf, char *name)
	107	{
	108	struct child *ch;
	109
	110	for(ch = cf->children; ch; ch = ch->next) {
	111	if(!strcmp(ch->name, name))
	112	break;
	113	}
	114	return(ch);
	115	}
	116
	117	static struct rule newrule(struct pattern pat)
	118	{
	119	int i;
	120	struct rule *rule;
	121
	122	for(i = 0; pat->rules[i]; i++);
	123	pat->rules = srealloc(pat->rules, sizeof(pat->rules) (i + 2));
cceb3611	124	rule = pat->rules[i] = szmalloc(sizeof(*rule));
992ce9ef FT	125	pat->rules[i + 1] = NULL;
	126	return(rule);
	127	}
	128
	129	static struct pattern *newpattern(void)
	130	{
	131	struct pattern *pat;
	132
	133	omalloc(pat);
	134	pat->rules = szmalloc(sizeof(*pat->rules));
	135	return(pat);
	136	}
	137
06c1a718 FT	138	static struct pattern parsepattern(struct cfstate s)
	139	{
	140	struct pattern *pat;
	141	struct rule *rule;
	142	int sl;
	143
	144	if(!strcmp(s->argv[0], "match")) {
	145	s->expstart = 1;
	146	pat = newpattern();
	147	} else {
	148	return(NULL);
	149	}
	150
	151	sl = s->lno;
	152	while(1) {
	153	getcfline(s);
	154	if(!strcmp(s->argv[0], "filename")) {
	155	if(s->argc < 2) {
	156	flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", s->file, s->lno);
	157	continue;
	158	}
	159	rule = newrule(pat);
	160	rule->type = PAT_BASENAME;
	161	rule->pattern = sstrdup(s->argv[1]);
	162	} else if(!strcmp(s->argv[0], "pathname")) {
	163	if(s->argc < 2) {
	164	flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", s->file, s->lno);
	165	continue;
	166	}
	167	rule = newrule(pat);
	168	rule->type = PAT_PATHNAME;
	169	rule->pattern = sstrdup(s->argv[1]);
	170	} else if(!strcmp(s->argv[0], "all")) {
	171	newrule(pat)->type = PAT_ALL;
	172	} else if(!strcmp(s->argv[0], "default")) {
	173	newrule(pat)->type = PAT_DEFAULT;
	174	} else if(!strcmp(s->argv[0], "handler")) {
	175	if(s->argc < 2) {
	176	flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno);
	177	continue;
	178	}
	179	if(pat->childnm != NULL)
	180	free(pat->childnm);
	181	pat->childnm = sstrdup(s->argv[1]);
	182	} else if(!strcmp(s->argv[0], "end") \|\| !strcmp(s->argv[0], "eof")) {
	183	break;
	184	} else {
	185	flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]);
	186	}
	187	}
	188
	189	if(pat->rules[0] == NULL) {
	190	flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl);
	191	freepattern(pat);
	192	return(NULL);
	193	}
	194	if(pat->childnm == NULL) {
	195	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl);
	196	freepattern(pat);
	197	return(NULL);
	198	}
	199	return(pat);
	200	}
	201
992ce9ef FT	202	static struct config readconfig(char path)
992ce9ef FT	203	{
06c1a718 FT	204	struct cfstate *s;
06c1a718 FT	205	FILE *in;
992ce9ef	206	struct config *cf;
992ce9ef FT	207	struct child *child;
992ce9ef FT	208	struct pattern *pat;
992ce9ef	209	struct stat sb;
06c1a718	210	char *p;
992ce9ef	211
cceb3611 FT	212	p = sprintf3("%s/.htrc", path);
cceb3611 FT	213	if(stat(p, &sb))
992ce9ef	214	return(NULL);
06c1a718 FT	215	if((in = fopen(p, "r")) == NULL) {
06c1a718 FT	216	flog(LOG_WARNING, "%s: %s", p, strerror(errno));
992ce9ef	217	return(NULL);
06c1a718 FT	218	}
06c1a718 FT	219	s = mkcfparser(in, p);
992ce9ef FT	220	omalloc(cf);
	221	cf->mtime = sb.st_mtime;
	222	cf->path = sstrdup(path);
06c1a718 FT	223
	224	while(1) {
	225	getcfline(s);
	226	if((child = parsechild(s)) != NULL) {
	227	child->next = cf->children;
	228	cf->children = child;
	229	} else if((pat = parsepattern(s)) != NULL) {
	230	pat->next = cf->patterns;
	231	cf->patterns = pat;
	232	} else if(!strcmp(s->argv[0], "eof")) {
	233	break;
	234	} else {
	235	flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]);
992ce9ef	236	}
06c1a718	237	}
992ce9ef	238
06c1a718 FT	239	freecfparser(s);
06c1a718 FT	240	fclose(in);
992ce9ef FT	241	return(cf);
	242	}
	243
	244	static struct config getconfig(char path)
	245	{
	246	struct config *cf;
	247	struct stat sb;
	248
	249	for(cf = cflist; cf != NULL; cf = cf->next) {
	250	if(!strcmp(cf->path, path)) {
cceb3611	251	if(stat(sprintf3("%s/.htrc", path), &sb))
992ce9ef FT	252	return(NULL);
	253	if(sb.st_mtime != cf->mtime) {
	254	freeconfig(cf);
	255	break;
	256	}
	257	return(cf);
	258	}
	259	}
	260	if((cf = readconfig(path)) != NULL) {
	261	cf->next = cflist;
	262	cflist = cf;
	263	}
	264	return(cf);
	265	}
	266
992ce9ef FT	267	static struct child findchild(char file, char *name)
	268	{
	269	char buf, p;
	270	struct config *cf;
	271	struct child *ch;
	272
	273	buf = sstrdup(file);
	274	while(1) {
	275	ch = NULL;
	276	if(!strcmp(buf, "."))
	277	break;
	278	if((p = strrchr(buf, '/')) != NULL)
	279	*p = 0;
	280	else
	281	strcpy(buf, ".");
	282	cf = getconfig(buf);
	283	if(cf == NULL)
	284	continue;
	285	if((ch = getchild(cf, name)) != NULL)
	286	break;
	287	}
	288	free(buf);
	289	return(ch);
	290	}
	291
	292	static struct pattern findmatch(char file, int trydefault)
	293	{
	294	int i;
	295	char buf, p, *bn;
	296	struct config *cf;
	297	struct pattern *pat;
	298	struct rule *rule;
	299
	300	if((bn = strrchr(file, '/')) != NULL)
	301	bn++;
	302	else
	303	bn = file;
	304	buf = sstrdup(file);
	305	while(1) {
	306	pat = NULL;
	307	if(!strcmp(buf, "."))
	308	break;
	309	if((p = strrchr(buf, '/')) != NULL)
	310	*p = 0;
	311	else
	312	strcpy(buf, ".");
	313	cf = getconfig(buf);
	314	if(cf == NULL)
	315	continue;
	316	for(pat = cf->patterns; pat != NULL; pat = pat->next) {
	317	for(i = 0; (rule = pat->rules[i]) != NULL; i++) {
	318	if(rule->type == PAT_BASENAME) {
	319	if(fnmatch(rule->pattern, bn, 0))
	320	break;
	321	} else if(rule->type == PAT_PATHNAME) {
	322	if(fnmatch(rule->pattern, file, FNM_PATHNAME))
	323	break;
	324	} else if(rule->type == PAT_ALL) {
	325	} else if(rule->type == PAT_DEFAULT) {
	326	if(!trydefault)
	327	break;
	328	}
	329	}
	330	if(!rule)
331	goto out;
332	}
333	}
334
335	out:
336	free(buf);
337	return(pat);
338	}
339
340	static void forkchild(struct child *ch)
341	{
342	ch->fd = stdmkchild(ch->argv);
343	}
344
345	static void passreq(struct child ch, struct hthead req, int fd)
346	{
347	if(ch->fd < 0)
348	forkchild(ch);
349	if(sendreq(ch->fd, req, fd)) {
350	if(errno == EPIPE) {
351	/* Assume that the child has crashed and restart it. */
352	forkchild(ch);
353	if(!sendreq(ch->fd, req, fd))
354	return;
355	}
356	flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno));
357	close(ch->fd);
358	ch->fd = -1;
da6187f5	359	simpleerror(fd, 500, "Server Error", "The request handler crashed.");
992ce9ef FT	360	}
	361	}
	362
54cefaba	363	static void handlefile(struct hthead req, int fd, char path)
992ce9ef	364	{
992ce9ef FT	365	struct pattern *pat;
992ce9ef FT	366	struct child *ch;
54cefaba FT	367
	368	headappheader(req, "X-Ash-File", path);
	369	if(((pat = findmatch(path, 0)) == NULL) && ((pat = findmatch(path, 1)) == NULL)) {
992ce9ef	370	/* XXX: Send a 500 error? 404? */
992ce9ef FT	371	return;
992ce9ef FT	372	}
54cefaba	373	if((ch = findchild(path, pat->childnm)) == NULL) {
992ce9ef	374	flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm);
d422fdfd	375	simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm);
992ce9ef FT	376	return;
	377	}
	378
	379	if(ch->type == CH_SOCKET) {
	380	passreq(ch, req, fd);
	381	} else if(ch->type == CH_FORK) {
	382	stdforkserve(ch->argv, req, fd);
	383	}
54cefaba FT	384	}
	385
	386	static void handledir(struct hthead req, int fd, char path)
	387	{
d422fdfd	388	/* XXX: Todo */
06c1a718	389	simpleerror(fd, 403, "Not Authorized", "Will not send directory listings or indices yet.");
54cefaba FT	390	}
	391
	392	static int checkdir(struct hthead req, int fd, char path)
	393	{
	394	return(0);
	395	}
	396
	397	static void serve(struct hthead *req, int fd)
	398	{
	399	char p, p2, path, tmp, buf, p3, *nm;
	400	struct stat sb;
	401	DIR *dir;
	402	struct dirent *dent;
992ce9ef	403
54cefaba FT	404	nm = req->rest;
	405	path = sstrdup(".");
	406	p = nm;
	407	while(1) {
	408	if((p2 = strchr(p, '/')) == NULL) {
	409	} else {
	410	*(p2++) = 0;
	411	}
	412
	413	if(!*p) {
	414	if(p2 == NULL) {
	415	if(stat(path, &sb)) {
	416	flog(LOG_WARNING, "failed to stat previously stated directory %s: %s", path, strerror(errno));
d422fdfd	417	simpleerror(fd, 500, "Internal Server Error", "The server encountered an unexpected condition.");
54cefaba FT	418	goto fail;
	419	}
	420	break;
	421	} else {
d422fdfd	422	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	423	goto fail;
	424	}
	425	}
d422fdfd FT	426	if(*p == '.') {
d422fdfd FT	427	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba	428	goto fail;
d422fdfd	429	}
54cefaba FT	430
	431	getconfig(path);
	432
	433	/*
	434	* First, check the name verbatimely:
	435	*/
	436	buf = sprintf3("%s/%s", path, p);
	437	if(!stat(buf, &sb)) {
	438	if(S_ISDIR(sb.st_mode)) {
	439	tmp = path;
	440	if(!strcmp(path, "."))
	441	path = sstrdup(p);
	442	else
	443	path = sprintf2("%s/%s", path, p);
	444	free(tmp);
	445	if(checkdir(req, fd, path))
	446	break;
	447	goto next;
	448	}
	449	if(S_ISREG(sb.st_mode)) {
	450	tmp = path;
	451	path = sprintf2("%s/%s", path, p);
	452	free(tmp);
	453	break;
	454	}
d422fdfd	455	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	456	goto fail;
	457	}
	458
	459	/*
	460	* Check the file extensionlessly:
	461	*/
	462	if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) {
	463	while((dent = readdir(dir)) != NULL) {
	464	buf = sprintf3("%s/%s", path, dent->d_name);
	465	if((p3 = strchr(dent->d_name, '.')) != NULL)
	466	*p3 = 0;
	467	if(strcmp(dent->d_name, p))
	468	continue;
	469	if(stat(buf, &sb))
	470	continue;
	471	if(!S_ISREG(sb.st_mode))
	472	continue;
	473	tmp = path;
	474	path = sstrdup(buf);
	475	free(tmp);
	476	break;
	477	}
	478	closedir(dir);
	479	if(dent != NULL)
	480	break;
	481	}
	482
d422fdfd	483	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	484	goto fail;
	485
	486	next:
	487	if(p2 == NULL)
	488	break;
	489	p = p2;
	490	}
	491	if(p2 == NULL)
	492	replrest(req, "");
	493	else
	494	replrest(req, p2);
	495	if(!strncmp(path, "./", 2))
	496	memmove(path, path + 2, strlen(path + 2) + 1);
	497	if(S_ISDIR(sb.st_mode)) {
	498	handledir(req, fd, path);
	499	} else if(S_ISREG(sb.st_mode)) {
	500	handlefile(req, fd, path);
	501	} else {
d422fdfd	502	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	503	goto fail;
	504	}
	505	goto out;
	506
	507	fail:
d422fdfd	508	/* No special handling, for now at least. */
54cefaba FT	509	out:
54cefaba FT	510	free(path);
992ce9ef FT	511	}
	512
	513	int main(int argc, char **argv)
	514	{
	515	struct hthead *req;
	516	int fd;
	517
	518	if(argc < 2) {
	519	flog(LOG_ERR, "usage: dirplex DIR");
	520	exit(1);
	521	}
	522	if(chdir(argv[1])) {
	523	flog(LOG_ERR, "could not change directory to %s: %s", argv[1], strerror(errno));
	524	exit(1);
	525	}
	526	signal(SIGCHLD, SIG_IGN);
	527	while(1) {
	528	if((fd = recvreq(0, &req)) < 0) {
	529	if(errno != 0)
	530	flog(LOG_ERR, "recvreq: %s", strerror(errno));
	531	break;
	532	}
	533	serve(req, fd);
	534	freehthead(req);
	535	close(fd);
	536	}
	537	return(0);
	538	}