[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>
#include <time.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 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, lastck;
    struct child *children;
    struct pattern *patterns;
};

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

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

static struct config *cflist;
static struct config *gconfig, *lconfig;
static time_t now;

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);
    freeca(pat->fchild);
    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;
    if(cf->path != NULL)
	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, i;

    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], "fork")) {
	    pat->fchild = smalloc(sizeof(*pat->fchild) * s->argc);
	    for(i = 0; i < s->argc - 1; i++)
		pat->fchild[i] = sstrdup(s->argv[i + 1]);
	    pat->fchild[i] = 0;
	} 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) && (pat->fchild == NULL)) {
	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl);
	freepattern(pat);
	return(NULL);
    }
    return(pat);
}

static struct config *emptyconfig(void)
{
    struct config *cf;
    
    omalloc(cf);
    return(cf);
}

static struct config *readconfig(char *file)
{
    struct cfstate *s;
    FILE *in;
    struct config *cf;
    struct child *child;
    struct pattern *pat;
    
    if((in = fopen(file, "r")) == NULL) {
	flog(LOG_WARNING, "%s: %s", file, strerror(errno));
	return(NULL);
    }
    s = mkcfparser(in, file);
    cf = emptyconfig();
    
    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;
    char *fn;
    time_t mtime;
    
    fn = sprintf3("%s/.htrc", path);
    for(cf = cflist; cf != NULL; cf = cf->next) {
	if(!strcmp(cf->path, path)) {
	    if(now - cf->lastck > 5) {
		if(stat(fn, &sb) || (sb.st_mtime != cf->mtime)) {
		    freeconfig(cf);
		    break;
		}
	    }
	    cf->lastck = now;
	    return(cf);
	}
    }
    if(access(fn, R_OK) || stat(fn, &sb)) {
	cf = emptyconfig();
	mtime = 0;
    } else {
	if((cf = readconfig(fn)) == NULL)
	    return(NULL);
	mtime = sb.st_mtime;
    }
    cf->path = sstrdup(path);
    cf->mtime = mtime;
    cf->lastck = now;
    cf->next = cflist;
    cflist = cf;
    return(cf);
}

static struct config **getconfigs(char *file)
{
    static struct config **ret = NULL;
    struct {
	struct config **b;
	size_t s, d;
    } buf;
    struct config *cf;
    char *tmp, *p;
    
    if(ret != NULL)
	free(ret);
    bufinit(buf);
    tmp = sstrdup(file);
    while(1) {
	if((p = strrchr(tmp, '/')) == NULL)
	    break;
	*p = 0;
	if((cf = getconfig(tmp)) != NULL)
	    bufadd(buf, cf);
    }
    free(tmp);
    if((cf = getconfig(".")) != NULL)
	bufadd(buf, cf);
    if(lconfig != NULL)
	bufadd(buf, lconfig);
    if(gconfig != NULL)
	bufadd(buf, gconfig);
    bufadd(buf, NULL);
    return(ret = buf.b);
}

static struct child *findchild(char *file, char *name)
{
    int i;
    struct config **cfs;
    struct child *ch;
    
    cfs = getconfigs(file);
    for(i = 0; cfs[i] != NULL; i++) {
	if((ch = getchild(cfs[i], name)) != NULL)
	    break;
    }
    return(ch);
}

static struct pattern *findmatch(char *file, int trydefault)
{
    int i, c;
    char *bn;
    struct config **cfs;
    struct pattern *pat;
    struct rule *rule;
    
    if((bn = strrchr(file, '/')) != NULL)
	bn++;
    else
	bn = file;
    cfs = getconfigs(file);
    for(c = 0; cfs[c] != NULL; c++) {
	for(pat = cfs[c]->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)
		return(pat);
	}
    }
    return(NULL);
}

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)) {
	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
	return;
    }
    if(pat->fchild) {
	stdforkserve(pat->fchild, req, fd);
    } 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))
	    simpleerror(fd, 500, "Server Error", "The request handler crashed.");
    }
}

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;
    
    now = time(NULL);
    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(p2 == NULL) {
		    stdredir(req, fd, 301, sprintf3("%s/", p));
		    goto out;
		}
		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);
}

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;
    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((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
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>
17e55136	28	#include <time.h>
992ce9ef FT	29
	30	#ifdef HAVE_CONFIG_H
	31	#include <config.h>
	32	#endif
	33	#include <utils.h>
	34	#include <mt.h>
	35	#include <log.h>
	36	#include <req.h>
	37	#include <proc.h>
d422fdfd	38	#include <resp.h>
06c1a718	39	#include <cf.h>
992ce9ef	40
992ce9ef FT	41	#define PAT_BASENAME 0
	42	#define PAT_PATHNAME 1
	43	#define PAT_ALL 2
	44	#define PAT_DEFAULT 3
	45
	46	struct config {
	47	struct config next, prev;
	48	char *path;
17e55136	49	time_t mtime, lastck;
992ce9ef FT	50	struct child *children;
	51	struct pattern *patterns;
	52	};
	53
992ce9ef FT	54	struct rule {
	55	int type;
	56	char *pattern;
	57	};
	58
	59	struct pattern {
	60	struct pattern *next;
	61	char *childnm;
624f637d	62	char **fchild;
992ce9ef FT	63	struct rule **rules;
	64	};
	65
0fc6fd13 FT	66	static struct config *cflist;
0fc6fd13 FT	67	static struct config gconfig, lconfig;
17e55136	68	static time_t now;
992ce9ef	69
992ce9ef FT	70	static void freepattern(struct pattern *pat)
	71	{
	72	struct rule **rule;
	73
	74	for(rule = pat->rules; *rule; rule++) {
	75	if((*rule)->pattern != NULL)
	76	free((*rule)->pattern);
	77	free(*rule);
	78	}
	79	if(pat->childnm != NULL)
	80	free(pat->childnm);
624f637d	81	freeca(pat->fchild);
992ce9ef FT	82	free(pat);
	83	}
	84
	85	static void freeconfig(struct config *cf)
	86	{
	87	struct child ch, nch;
	88	struct pattern pat, npat;
	89
	90	if(cf->prev != NULL)
	91	cf->prev->next = cf->next;
	92	if(cf->next != NULL)
	93	cf->next->prev = cf->prev;
	94	if(cf == cflist)
	95	cflist = cf->next;
0fc6fd13 FT	96	if(cf->path != NULL)
0fc6fd13 FT	97	free(cf->path);
992ce9ef FT	98	for(ch = cf->children; ch != NULL; ch = nch) {
	99	nch = ch->next;
	100	freechild(ch);
	101	}
	102	for(pat = cf->patterns; pat != NULL; pat = npat) {
	103	npat = pat->next;
	104	freepattern(pat);
	105	}
	106	free(cf);
	107	}
	108
992ce9ef FT	109	static struct child getchild(struct config cf, char *name)
	110	{
	111	struct child *ch;
	112
	113	for(ch = cf->children; ch; ch = ch->next) {
	114	if(!strcmp(ch->name, name))
	115	break;
	116	}
	117	return(ch);
	118	}
	119
	120	static struct rule newrule(struct pattern pat)
	121	{
	122	int i;
	123	struct rule *rule;
	124
	125	for(i = 0; pat->rules[i]; i++);
	126	pat->rules = srealloc(pat->rules, sizeof(pat->rules) (i + 2));
cceb3611	127	rule = pat->rules[i] = szmalloc(sizeof(*rule));
992ce9ef FT	128	pat->rules[i + 1] = NULL;
	129	return(rule);
	130	}
	131
	132	static struct pattern *newpattern(void)
	133	{
	134	struct pattern *pat;
	135
	136	omalloc(pat);
	137	pat->rules = szmalloc(sizeof(*pat->rules));
	138	return(pat);
	139	}
	140
06c1a718 FT	141	static struct pattern parsepattern(struct cfstate s)
	142	{
	143	struct pattern *pat;
	144	struct rule *rule;
624f637d	145	int sl, i;
06c1a718 FT	146
	147	if(!strcmp(s->argv[0], "match")) {
	148	s->expstart = 1;
	149	pat = newpattern();
	150	} else {
	151	return(NULL);
	152	}
	153
	154	sl = s->lno;
	155	while(1) {
	156	getcfline(s);
	157	if(!strcmp(s->argv[0], "filename")) {
	158	if(s->argc < 2) {
	159	flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", s->file, s->lno);
	160	continue;
	161	}
	162	rule = newrule(pat);
	163	rule->type = PAT_BASENAME;
	164	rule->pattern = sstrdup(s->argv[1]);
	165	} else if(!strcmp(s->argv[0], "pathname")) {
	166	if(s->argc < 2) {
	167	flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", s->file, s->lno);
	168	continue;
	169	}
	170	rule = newrule(pat);
	171	rule->type = PAT_PATHNAME;
	172	rule->pattern = sstrdup(s->argv[1]);
	173	} else if(!strcmp(s->argv[0], "all")) {
	174	newrule(pat)->type = PAT_ALL;
	175	} else if(!strcmp(s->argv[0], "default")) {
	176	newrule(pat)->type = PAT_DEFAULT;
	177	} else if(!strcmp(s->argv[0], "handler")) {
	178	if(s->argc < 2) {
	179	flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno);
	180	continue;
	181	}
	182	if(pat->childnm != NULL)
	183	free(pat->childnm);
	184	pat->childnm = sstrdup(s->argv[1]);
624f637d FT	185	} else if(!strcmp(s->argv[0], "fork")) {
	186	pat->fchild = smalloc(sizeof(pat->fchild) s->argc);
	187	for(i = 0; i < s->argc - 1; i++)
	188	pat->fchild[i] = sstrdup(s->argv[i + 1]);
	189	pat->fchild[i] = 0;
06c1a718 FT	190	} else if(!strcmp(s->argv[0], "end") \|\| !strcmp(s->argv[0], "eof")) {
	191	break;
	192	} else {
	193	flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]);
	194	}
	195	}
	196
	197	if(pat->rules[0] == NULL) {
	198	flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl);
	199	freepattern(pat);
	200	return(NULL);
	201	}
624f637d	202	if((pat->childnm == NULL) && (pat->fchild == NULL)) {
06c1a718 FT	203	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl);
	204	freepattern(pat);
	205	return(NULL);
	206	}
	207	return(pat);
	208	}
	209
17e55136 FT	210	static struct config *emptyconfig(void)
	211	{
	212	struct config *cf;
	213
	214	omalloc(cf);
	215	return(cf);
	216	}
	217
	218	static struct config readconfig(char file)
992ce9ef	219	{
06c1a718 FT	220	struct cfstate *s;
06c1a718 FT	221	FILE *in;
992ce9ef	222	struct config *cf;
992ce9ef FT	223	struct child *child;
992ce9ef FT	224	struct pattern *pat;
992ce9ef	225
17e55136 FT	226	if((in = fopen(file, "r")) == NULL) {
17e55136 FT	227	flog(LOG_WARNING, "%s: %s", file, strerror(errno));
992ce9ef	228	return(NULL);
06c1a718	229	}
17e55136 FT	230	s = mkcfparser(in, file);
17e55136 FT	231	cf = emptyconfig();
06c1a718 FT	232
	233	while(1) {
	234	getcfline(s);
	235	if((child = parsechild(s)) != NULL) {
	236	child->next = cf->children;
	237	cf->children = child;
	238	} else if((pat = parsepattern(s)) != NULL) {
	239	pat->next = cf->patterns;
	240	cf->patterns = pat;
	241	} else if(!strcmp(s->argv[0], "eof")) {
	242	break;
	243	} else {
	244	flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]);
992ce9ef	245	}
06c1a718	246	}
992ce9ef	247
06c1a718 FT	248	freecfparser(s);
06c1a718 FT	249	fclose(in);
992ce9ef FT	250	return(cf);
	251	}
	252
	253	static struct config getconfig(char path)
	254	{
	255	struct config *cf;
	256	struct stat sb;
17e55136 FT	257	char *fn;
17e55136 FT	258	time_t mtime;
992ce9ef	259
17e55136	260	fn = sprintf3("%s/.htrc", path);
992ce9ef FT	261	for(cf = cflist; cf != NULL; cf = cf->next) {
992ce9ef FT	262	if(!strcmp(cf->path, path)) {
17e55136 FT	263	if(now - cf->lastck > 5) {
	264	if(stat(fn, &sb) \|\| (sb.st_mtime != cf->mtime)) {
	265	freeconfig(cf);
	266	break;
	267	}
992ce9ef	268	}
17e55136	269	cf->lastck = now;
992ce9ef FT	270	return(cf);
	271	}
	272	}
17e55136 FT	273	if(access(fn, R_OK) \|\| stat(fn, &sb)) {
	274	cf = emptyconfig();
	275	mtime = 0;
	276	} else {
	277	if((cf = readconfig(fn)) == NULL)
	278	return(NULL);
	279	mtime = sb.st_mtime;
992ce9ef	280	}
17e55136 FT	281	cf->path = sstrdup(path);
	282	cf->mtime = mtime;
	283	cf->lastck = now;
	284	cf->next = cflist;
	285	cflist = cf;
992ce9ef FT	286	return(cf);
	287	}
	288
8dce6d19	289	static struct config *getconfigs(char file)
992ce9ef	290	{
8dce6d19 FT	291	static struct config **ret = NULL;
	292	struct {
	293	struct config **b;
	294	size_t s, d;
	295	} buf;
992ce9ef	296	struct config *cf;
8dce6d19 FT	297	char tmp, p;
	298
	299	if(ret != NULL)
	300	free(ret);
	301	bufinit(buf);
	302	tmp = sstrdup(file);
992ce9ef	303	while(1) {
8dce6d19	304	if((p = strrchr(tmp, '/')) == NULL)
992ce9ef	305	break;
8dce6d19 FT	306	*p = 0;
	307	if((cf = getconfig(tmp)) != NULL)
	308	bufadd(buf, cf);
	309	}
	310	free(tmp);
	311	if((cf = getconfig(".")) != NULL)
	312	bufadd(buf, cf);
0fc6fd13 FT	313	if(lconfig != NULL)
	314	bufadd(buf, lconfig);
	315	if(gconfig != NULL)
	316	bufadd(buf, gconfig);
8dce6d19 FT	317	bufadd(buf, NULL);
	318	return(ret = buf.b);
	319	}
	320
	321	static struct child findchild(char file, char *name)
	322	{
	323	int i;
	324	struct config **cfs;
	325	struct child *ch;
	326
	327	cfs = getconfigs(file);
	328	for(i = 0; cfs[i] != NULL; i++) {
	329	if((ch = getchild(cfs[i], name)) != NULL)
992ce9ef FT	330	break;
992ce9ef FT	331	}
992ce9ef FT	332	return(ch);
	333	}
	334
	335	static struct pattern findmatch(char file, int trydefault)
	336	{
8dce6d19 FT	337	int i, c;
	338	char *bn;
	339	struct config **cfs;
992ce9ef FT	340	struct pattern *pat;
	341	struct rule *rule;
	342
	343	if((bn = strrchr(file, '/')) != NULL)
	344	bn++;
	345	else
	346	bn = file;
8dce6d19 FT	347	cfs = getconfigs(file);
	348	for(c = 0; cfs[c] != NULL; c++) {
	349	for(pat = cfs[c]->patterns; pat != NULL; pat = pat->next) {
992ce9ef FT	350	for(i = 0; (rule = pat->rules[i]) != NULL; i++) {
	351	if(rule->type == PAT_BASENAME) {
	352	if(fnmatch(rule->pattern, bn, 0))
	353	break;
	354	} else if(rule->type == PAT_PATHNAME) {
	355	if(fnmatch(rule->pattern, file, FNM_PATHNAME))
	356	break;
	357	} else if(rule->type == PAT_ALL) {
	358	} else if(rule->type == PAT_DEFAULT) {
	359	if(!trydefault)
	360	break;
	361	}
	362	}
	363	if(!rule)
8dce6d19	364	return(pat);
992ce9ef FT	365	}
992ce9ef FT	366	}
8dce6d19	367	return(NULL);
992ce9ef FT	368	}
992ce9ef FT	369
54cefaba	370	static void handlefile(struct hthead req, int fd, char path)
992ce9ef	371	{
992ce9ef FT	372	struct pattern *pat;
992ce9ef FT	373	struct child *ch;
54cefaba FT	374
	375	headappheader(req, "X-Ash-File", path);
	376	if(((pat = findmatch(path, 0)) == NULL) && ((pat = findmatch(path, 1)) == NULL)) {
d58ed97c	377	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
992ce9ef FT	378	return;
992ce9ef FT	379	}
624f637d FT	380	if(pat->fchild) {
	381	stdforkserve(pat->fchild, req, fd);
	382	} else {
	383	if((ch = findchild(path, pat->childnm)) == NULL) {
	384	flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm);
	385	simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm);
	386	return;
	387	}
	388	if(childhandle(ch, req, fd))
	389	simpleerror(fd, 500, "Server Error", "The request handler crashed.");
992ce9ef	390	}
54cefaba FT	391	}
	392
	393	static void handledir(struct hthead req, int fd, char path)
	394	{
d422fdfd	395	/* XXX: Todo */
06c1a718	396	simpleerror(fd, 403, "Not Authorized", "Will not send directory listings or indices yet.");
54cefaba FT	397	}
	398
	399	static int checkdir(struct hthead req, int fd, char path)
	400	{
	401	return(0);
	402	}
	403
	404	static void serve(struct hthead *req, int fd)
	405	{
	406	char p, p2, path, tmp, buf, p3, *nm;
	407	struct stat sb;
	408	DIR *dir;
	409	struct dirent *dent;
992ce9ef	410
17e55136	411	now = time(NULL);
54cefaba FT	412	nm = req->rest;
	413	path = sstrdup(".");
	414	p = nm;
	415	while(1) {
	416	if((p2 = strchr(p, '/')) == NULL) {
	417	} else {
	418	*(p2++) = 0;
	419	}
	420
	421	if(!*p) {
	422	if(p2 == NULL) {
	423	if(stat(path, &sb)) {
	424	flog(LOG_WARNING, "failed to stat previously stated directory %s: %s", path, strerror(errno));
d422fdfd	425	simpleerror(fd, 500, "Internal Server Error", "The server encountered an unexpected condition.");
54cefaba FT	426	goto fail;
	427	}
	428	break;
	429	} else {
d422fdfd	430	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	431	goto fail;
	432	}
	433	}
d422fdfd FT	434	if(*p == '.') {
d422fdfd FT	435	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba	436	goto fail;
d422fdfd	437	}
54cefaba FT	438
	439	getconfig(path);
	440
	441	/*
	442	* First, check the name verbatimely:
	443	*/
	444	buf = sprintf3("%s/%s", path, p);
	445	if(!stat(buf, &sb)) {
	446	if(S_ISDIR(sb.st_mode)) {
	447	tmp = path;
	448	if(!strcmp(path, "."))
	449	path = sstrdup(p);
	450	else
	451	path = sprintf2("%s/%s", path, p);
	452	free(tmp);
755faed0 FT	453	if(p2 == NULL) {
	454	stdredir(req, fd, 301, sprintf3("%s/", p));
	455	goto out;
	456	}
54cefaba FT	457	if(checkdir(req, fd, path))
	458	break;
	459	goto next;
	460	}
	461	if(S_ISREG(sb.st_mode)) {
	462	tmp = path;
	463	path = sprintf2("%s/%s", path, p);
	464	free(tmp);
	465	break;
	466	}
d422fdfd	467	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	468	goto fail;
	469	}
	470
	471	/*
	472	* Check the file extensionlessly:
	473	*/
	474	if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) {
	475	while((dent = readdir(dir)) != NULL) {
	476	buf = sprintf3("%s/%s", path, dent->d_name);
	477	if((p3 = strchr(dent->d_name, '.')) != NULL)
	478	*p3 = 0;
	479	if(strcmp(dent->d_name, p))
	480	continue;
	481	if(stat(buf, &sb))
	482	continue;
	483	if(!S_ISREG(sb.st_mode))
	484	continue;
	485	tmp = path;
	486	path = sstrdup(buf);
	487	free(tmp);
	488	break;
	489	}
	490	closedir(dir);
	491	if(dent != NULL)
	492	break;
	493	}
	494
d422fdfd	495	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	496	goto fail;
	497
	498	next:
	499	if(p2 == NULL)
	500	break;
	501	p = p2;
	502	}
	503	if(p2 == NULL)
	504	replrest(req, "");
	505	else
	506	replrest(req, p2);
	507	if(!strncmp(path, "./", 2))
	508	memmove(path, path + 2, strlen(path + 2) + 1);
	509	if(S_ISDIR(sb.st_mode)) {
	510	handledir(req, fd, path);
	511	} else if(S_ISREG(sb.st_mode)) {
	512	handlefile(req, fd, path);
	513	} else {
d422fdfd	514	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	515	goto fail;
	516	}
	517	goto out;
	518
	519	fail:
d422fdfd	520	/* No special handling, for now at least. */
54cefaba FT	521	out:
54cefaba FT	522	free(path);
992ce9ef FT	523	}
992ce9ef FT	524
0fc6fd13 FT	525	static void usage(FILE *out)
	526	{
	527	fprintf(out, "usage: dirplex [-hN] [-c CONFIG] DIR\n");
	528	}
	529
992ce9ef FT	530	int main(int argc, char **argv)
992ce9ef FT	531	{
0fc6fd13 FT	532	int c;
	533	int nodef;
	534	char gcf, lcf;
992ce9ef FT	535	struct hthead *req;
	536	int fd;
	537
0fc6fd13 FT	538	nodef = 0;
	539	lcf = NULL;
	540	while((c = getopt(argc, argv, "hNc:")) >= 0) {
	541	switch(c) {
	542	case 'h':
	543	usage(stdout);
	544	exit(0);
	545	case 'N':
	546	nodef = 1;
	547	break;
	548	case 'c':
	549	lcf = optarg;
	550	break;
	551	default:
	552	usage(stderr);
	553	exit(1);
	554	}
	555	}
	556	if(argc - optind < 1) {
	557	usage(stderr);
992ce9ef FT	558	exit(1);
992ce9ef FT	559	}
0fc6fd13 FT	560	if(!nodef) {
	561	if((gcf = findstdconf("ashd/dirplex.rc")) != NULL) {
	562	gconfig = readconfig(gcf);
	563	free(gcf);
	564	}
	565	}
	566	if(lcf != NULL) {
	567	if((lconfig = readconfig(lcf)) == NULL)
	568	exit(1);
	569	}
	570	if(chdir(argv[optind])) {
	571	flog(LOG_ERR, "could not change directory to %s: %s", argv[optind], strerror(errno));
992ce9ef FT	572	exit(1);
	573	}
	574	signal(SIGCHLD, SIG_IGN);
	575	while(1) {
	576	if((fd = recvreq(0, &req)) < 0) {
	577	if(errno != 0)
	578	flog(LOG_ERR, "recvreq: %s", strerror(errno));
	579	break;
	580	}
	581	serve(req, fd);
	582	freehthead(req);
	583	close(fd);
	584	}
	585	return(0);
	586	}