[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>

#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 child {
    struct child *next;
    char *name;
    int type;
    char **argv;
    int fd;
};

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

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

struct config *cflist;

static void freechild(struct child *ch)
{
    if(ch->fd != -1)
	close(ch->fd);
    if(ch->name != NULL)
	free(ch->name);
    if(ch->argv != NULL)
	freeca(ch->argv);
    free(ch);
}

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 *newchild(char *name, int type)
{
    struct child *ch;
    
    omalloc(ch);
    ch->name = sstrdup(name);
    ch->type = type;
    ch->fd = -1;
    return(ch);
}

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 config *readconfig(char *path)
{
    int i;
    struct config *cf;
    FILE *s;
    char line[1024];
    char *p, **w;
    int ind, eof;
    int lno;
    int state;
    int rv;
    int argc;
    struct child *child;
    struct pattern *pat;
    struct rule *rule;
    struct stat sb;
    
    p = sprintf3("%s/.htrc", path);
    if(stat(p, &sb))
	return(NULL);
    if((s = fopen(p, "r")) == NULL)
	return(NULL);
    omalloc(cf);
    cf->mtime = sb.st_mtime;
    cf->path = sstrdup(path);
    eof = 0;
    state = 0;
    w = NULL;
    lno = 0;
    do {
	if(fgets(line, sizeof(line), s) == NULL) {
	    eof = 1;
	    line[0] = 0;
	}
	lno++;
	for(p = line; *p; p++) {
	    if(*p == '#')
		continue;
	    if(!isspace(*p))
		break;
	}
	ind = isspace(line[0]);
	w = tokenize(line);
	argc = calen(w);
	
    retry:
	if(state == 0) {
	    if(ind) {
		flog(LOG_WARNING, "%s%i: unexpected line indentation in global scope", path, lno);
		goto next;
	    } else {
		if(!w[0]) {
		} else if(!strcmp(w[0], "child")) {
		    if(argc < 2) {
			flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno);
			goto next;
		    }
		    child = newchild(w[1], CH_SOCKET);
		    state = 1;
		} else if(!strcmp(w[0], "fchild")) {
		    if(argc < 2) {
			flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno);
			goto next;
		    }
		    child = newchild(w[1], CH_FORK);
		    state = 1;
		} else if(!strcmp(w[0], "match")) {
		    pat = newpattern();
		    state = 2;
		} else {
		    flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]);
		}
	    }
	} else if(state == 1) {
	    if(ind) {
		if(!w[0]) {
		} else if(!strcmp(w[0], "exec")) {
		    if(argc < 2) {
			flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", path, lno);
			goto next;
		    }
		    child->argv = szmalloc(sizeof(*child->argv) * argc);
		    for(i = 0; i < argc - 1; i++)
			child->argv[i] = sstrdup(w[i + 1]);
		} else {
		    flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]);
		}
	    } else {
		state = 0;
		if(child->argv == NULL) {
		    flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", path, lno, child->name);
		    freechild(child);
		    goto retry;
		}
		child->next = cf->children;
		cf->children = child;
		goto retry;
	    }
	} else if(state == 2) {
	    if(ind) {
		if(!w[0]) {
		} else if(!strcmp(w[0], "filename")) {
		    if(argc < 2) {
			flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", path, lno);
			goto next;
		    }
		    rule = newrule(pat);
		    rule->type = PAT_BASENAME;
		    rule->pattern = sstrdup(w[1]);
		} else if(!strcmp(w[0], "pathname")) {
		    if(argc < 2) {
			flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", path, lno);
			goto next;
		    }
		    rule = newrule(pat);
		    rule->type = PAT_PATHNAME;
		    rule->pattern = sstrdup(w[1]);
		} else if(!strcmp(w[0], "all")) {
		    newrule(pat)->type = PAT_ALL;
		} else if(!strcmp(w[0], "default")) {
		    newrule(pat)->type = PAT_DEFAULT;
		} else if(!strcmp(w[0], "handler")) {
		    if(argc < 2) {
			flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", path, lno);
			goto next;
		    }
		    if(pat->childnm != NULL)
			free(pat->childnm);
		    pat->childnm = sstrdup(w[1]);
		} else {
		    flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]);
		}
	    } else {
		state = 0;
		if(pat->rules[0] == NULL) {
		    flog(LOG_WARNING, "%s:%i: missing rules in match declaration", path, lno);
		    freepattern(pat);
		    goto retry;
		}
		if(pat->childnm == NULL) {
		    flog(LOG_WARNING, "%s:%i: missing handler in match declaration", path, lno);
		    freepattern(pat);
		    goto retry;
		}
		pat->next = cf->patterns;
		cf->patterns = pat;
		goto retry;
	    }
	}
	
    next:
	freeca(w);
	w = NULL;
    } while(!eof);
    rv = 0;
    
    if(w != NULL)
	freeca(w);
    fclose(s);
    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;
    }
}

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>
992ce9ef FT	38
	39	#define CH_SOCKET 0
	40	#define CH_FORK 1
	41
	42	#define PAT_BASENAME 0
	43	#define PAT_PATHNAME 1
	44	#define PAT_ALL 2
	45	#define PAT_DEFAULT 3
	46
	47	struct config {
	48	struct config next, prev;
	49	char *path;
	50	time_t mtime;
	51	struct child *children;
	52	struct pattern *patterns;
	53	};
	54
	55	struct child {
	56	struct child *next;
	57	char *name;
	58	int type;
	59	char **argv;
	60	int fd;
	61	};
	62
	63	struct rule {
	64	int type;
	65	char *pattern;
	66	};
	67
	68	struct pattern {
	69	struct pattern *next;
	70	char *childnm;
	71	struct rule **rules;
	72	};
	73
	74	struct config *cflist;
	75
	76	static void freechild(struct child *ch)
	77	{
	78	if(ch->fd != -1)
	79	close(ch->fd);
	80	if(ch->name != NULL)
	81	free(ch->name);
	82	if(ch->argv != NULL)
	83	freeca(ch->argv);
	84	free(ch);
	85	}
	86
	87	static void freepattern(struct pattern *pat)
	88	{
	89	struct rule **rule;
	90
	91	for(rule = pat->rules; *rule; rule++) {
	92	if((*rule)->pattern != NULL)
	93	free((*rule)->pattern);
	94	free(*rule);
	95	}
	96	if(pat->childnm != NULL)
	97	free(pat->childnm);
	98	free(pat);
	99	}
	100
	101	static void freeconfig(struct config *cf)
102	{
103	struct child ch, nch;
104	struct pattern pat, npat;
105
106	if(cf->prev != NULL)
107	cf->prev->next = cf->next;
108	if(cf->next != NULL)
109	cf->next->prev = cf->prev;
110	if(cf == cflist)
111	cflist = cf->next;
112	free(cf->path);
113	for(ch = cf->children; ch != NULL; ch = nch) {
114	nch = ch->next;
115	freechild(ch);
116	}
117	for(pat = cf->patterns; pat != NULL; pat = npat) {
118	npat = pat->next;
119	freepattern(pat);
120	}
121	free(cf);
122	}
123
124	static struct child newchild(char name, int type)
125	{
126	struct child *ch;
127
128	omalloc(ch);
129	ch->name = sstrdup(name);
130	ch->type = type;
131	ch->fd = -1;
132	return(ch);
133	}
134
135	static struct child getchild(struct config cf, char *name)
136	{
137	struct child *ch;
138
139	for(ch = cf->children; ch; ch = ch->next) {
140	if(!strcmp(ch->name, name))
141	break;
142	}
143	return(ch);
144	}
145
146	static struct rule newrule(struct pattern pat)
147	{
148	int i;
149	struct rule *rule;
150
151	for(i = 0; pat->rules[i]; i++);
152	pat->rules = srealloc(pat->rules, sizeof(pat->rules) (i + 2));
cceb3611	153	rule = pat->rules[i] = szmalloc(sizeof(*rule));
992ce9ef FT	154	pat->rules[i + 1] = NULL;
	155	return(rule);
	156	}
	157
	158	static struct pattern *newpattern(void)
	159	{
	160	struct pattern *pat;
	161
	162	omalloc(pat);
	163	pat->rules = szmalloc(sizeof(*pat->rules));
	164	return(pat);
	165	}
	166
	167	static struct config readconfig(char path)
	168	{
	169	int i;
	170	struct config *cf;
	171	FILE *s;
	172	char line[1024];
	173	char p, *w;
	174	int ind, eof;
	175	int lno;
	176	int state;
	177	int rv;
	178	int argc;
	179	struct child *child;
	180	struct pattern *pat;
	181	struct rule *rule;
	182	struct stat sb;
	183
cceb3611 FT	184	p = sprintf3("%s/.htrc", path);
cceb3611 FT	185	if(stat(p, &sb))
992ce9ef	186	return(NULL);
cceb3611	187	if((s = fopen(p, "r")) == NULL)
992ce9ef FT	188	return(NULL);
	189	omalloc(cf);
	190	cf->mtime = sb.st_mtime;
	191	cf->path = sstrdup(path);
	192	eof = 0;
	193	state = 0;
	194	w = NULL;
	195	lno = 0;
	196	do {
	197	if(fgets(line, sizeof(line), s) == NULL) {
	198	eof = 1;
	199	line[0] = 0;
	200	}
	201	lno++;
	202	for(p = line; *p; p++) {
	203	if(*p == '#')
	204	continue;
	205	if(!isspace(*p))
	206	break;
	207	}
	208	ind = isspace(line[0]);
	209	w = tokenize(line);
	210	argc = calen(w);
	211
	212	retry:
	213	if(state == 0) {
	214	if(ind) {
	215	flog(LOG_WARNING, "%s%i: unexpected line indentation in global scope", path, lno);
	216	goto next;
	217	} else {
	218	if(!w[0]) {
	219	} else if(!strcmp(w[0], "child")) {
	220	if(argc < 2) {
	221	flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno);
	222	goto next;
	223	}
	224	child = newchild(w[1], CH_SOCKET);
	225	state = 1;
	226	} else if(!strcmp(w[0], "fchild")) {
	227	if(argc < 2) {
	228	flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno);
	229	goto next;
	230	}
	231	child = newchild(w[1], CH_FORK);
	232	state = 1;
	233	} else if(!strcmp(w[0], "match")) {
	234	pat = newpattern();
	235	state = 2;
	236	} else {
	237	flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]);
	238	}
	239	}
	240	} else if(state == 1) {
	241	if(ind) {
	242	if(!w[0]) {
	243	} else if(!strcmp(w[0], "exec")) {
	244	if(argc < 2) {
	245	flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", path, lno);
	246	goto next;
	247	}
	248	child->argv = szmalloc(sizeof(child->argv) argc);
	249	for(i = 0; i < argc - 1; i++)
	250	child->argv[i] = sstrdup(w[i + 1]);
	251	} else {
252	flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]);
253	}
254	} else {
255	state = 0;
256	if(child->argv == NULL) {
257	flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", path, lno, child->name);
258	freechild(child);
259	goto retry;
260	}
261	child->next = cf->children;
262	cf->children = child;
263	goto retry;
264	}
265	} else if(state == 2) {
266	if(ind) {
267	if(!w[0]) {
268	} else if(!strcmp(w[0], "filename")) {
269	if(argc < 2) {
270	flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", path, lno);
271	goto next;
272	}
273	rule = newrule(pat);
274	rule->type = PAT_BASENAME;
275	rule->pattern = sstrdup(w[1]);
276	} else if(!strcmp(w[0], "pathname")) {
277	if(argc < 2) {
278	flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", path, lno);
279	goto next;
280	}
281	rule = newrule(pat);
282	rule->type = PAT_PATHNAME;
283	rule->pattern = sstrdup(w[1]);
284	} else if(!strcmp(w[0], "all")) {
285	newrule(pat)->type = PAT_ALL;
286	} else if(!strcmp(w[0], "default")) {
287	newrule(pat)->type = PAT_DEFAULT;
288	} else if(!strcmp(w[0], "handler")) {
289	if(argc < 2) {
290	flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", path, lno);
291	goto next;
292	}
293	if(pat->childnm != NULL)
294	free(pat->childnm);
295	pat->childnm = sstrdup(w[1]);
296	} else {
297	flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]);
298	}
299	} else {
300	state = 0;
301	if(pat->rules[0] == NULL) {
302	flog(LOG_WARNING, "%s:%i: missing rules in match declaration", path, lno);
303	freepattern(pat);
304	goto retry;
305	}
306	if(pat->childnm == NULL) {
307	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", path, lno);
308	freepattern(pat);
309	goto retry;
310	}
311	pat->next = cf->patterns;
312	cf->patterns = pat;
313	goto retry;
314	}
315	}
316
317	next:
318	freeca(w);
319	w = NULL;
320	} while(!eof);
321	rv = 0;
322
323	if(w != NULL)
324	freeca(w);
325	fclose(s);
326	return(cf);
327	}
328
329	static struct config getconfig(char path)
330	{
331	struct config *cf;
332	struct stat sb;
333
334	for(cf = cflist; cf != NULL; cf = cf->next) {
335	if(!strcmp(cf->path, path)) {
cceb3611	336	if(stat(sprintf3("%s/.htrc", path), &sb))
992ce9ef FT	337	return(NULL);
	338	if(sb.st_mtime != cf->mtime) {
	339	freeconfig(cf);
	340	break;
	341	}
	342	return(cf);
	343	}
	344	}
	345	if((cf = readconfig(path)) != NULL) {
	346	cf->next = cflist;
	347	cflist = cf;
	348	}
	349	return(cf);
	350	}
	351
992ce9ef FT	352	static struct child findchild(char file, char *name)
	353	{
	354	char buf, p;
	355	struct config *cf;
	356	struct child *ch;
	357
	358	buf = sstrdup(file);
	359	while(1) {
	360	ch = NULL;
	361	if(!strcmp(buf, "."))
	362	break;
	363	if((p = strrchr(buf, '/')) != NULL)
	364	*p = 0;
	365	else
	366	strcpy(buf, ".");
	367	cf = getconfig(buf);
	368	if(cf == NULL)
	369	continue;
	370	if((ch = getchild(cf, name)) != NULL)
	371	break;
	372	}
	373	free(buf);
	374	return(ch);
	375	}
	376
	377	static struct pattern findmatch(char file, int trydefault)
	378	{
	379	int i;
	380	char buf, p, *bn;
	381	struct config *cf;
	382	struct pattern *pat;
	383	struct rule *rule;
	384
	385	if((bn = strrchr(file, '/')) != NULL)
	386	bn++;
	387	else
	388	bn = file;
	389	buf = sstrdup(file);
	390	while(1) {
	391	pat = NULL;
	392	if(!strcmp(buf, "."))
	393	break;
	394	if((p = strrchr(buf, '/')) != NULL)
	395	*p = 0;
	396	else
	397	strcpy(buf, ".");
	398	cf = getconfig(buf);
	399	if(cf == NULL)
	400	continue;
	401	for(pat = cf->patterns; pat != NULL; pat = pat->next) {
	402	for(i = 0; (rule = pat->rules[i]) != NULL; i++) {
	403	if(rule->type == PAT_BASENAME) {
	404	if(fnmatch(rule->pattern, bn, 0))
	405	break;
	406	} else if(rule->type == PAT_PATHNAME) {
	407	if(fnmatch(rule->pattern, file, FNM_PATHNAME))
	408	break;
	409	} else if(rule->type == PAT_ALL) {
	410	} else if(rule->type == PAT_DEFAULT) {
	411	if(!trydefault)
	412	break;
	413	}
	414	}
	415	if(!rule)
416	goto out;
417	}
418	}
419
420	out:
421	free(buf);
422	return(pat);
423	}
424
425	static void forkchild(struct child *ch)
426	{
427	ch->fd = stdmkchild(ch->argv);
428	}
429
430	static void passreq(struct child ch, struct hthead req, int fd)
431	{
432	if(ch->fd < 0)
433	forkchild(ch);
434	if(sendreq(ch->fd, req, fd)) {
435	if(errno == EPIPE) {
436	/* Assume that the child has crashed and restart it. */
437	forkchild(ch);
438	if(!sendreq(ch->fd, req, fd))
439	return;
440	}
441	flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno));
442	close(ch->fd);
443	ch->fd = -1;
444	}
445	}
446
54cefaba	447	static void handlefile(struct hthead req, int fd, char path)
992ce9ef	448	{
992ce9ef FT	449	struct pattern *pat;
992ce9ef FT	450	struct child *ch;
54cefaba FT	451
	452	headappheader(req, "X-Ash-File", path);
	453	if(((pat = findmatch(path, 0)) == NULL) && ((pat = findmatch(path, 1)) == NULL)) {
992ce9ef	454	/* XXX: Send a 500 error? 404? */
992ce9ef FT	455	return;
992ce9ef FT	456	}
54cefaba	457	if((ch = findchild(path, pat->childnm)) == NULL) {
992ce9ef	458	flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm);
d422fdfd	459	simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm);
992ce9ef FT	460	return;
	461	}
	462
	463	if(ch->type == CH_SOCKET) {
	464	passreq(ch, req, fd);
	465	} else if(ch->type == CH_FORK) {
	466	stdforkserve(ch->argv, req, fd);
	467	}
54cefaba FT	468	}
	469
	470	static void handledir(struct hthead req, int fd, char path)
	471	{
d422fdfd FT	472	/* XXX: Todo */
d422fdfd FT	473	simpleerror(fd, 403, "Not Authorized", "Will not send directory listings or indices yet");
54cefaba FT	474	}
	475
	476	static int checkdir(struct hthead req, int fd, char path)
	477	{
	478	return(0);
	479	}
	480
	481	static void serve(struct hthead *req, int fd)
	482	{
	483	char p, p2, path, tmp, buf, p3, *nm;
	484	struct stat sb;
	485	DIR *dir;
	486	struct dirent *dent;
992ce9ef	487
54cefaba FT	488	nm = req->rest;
	489	path = sstrdup(".");
	490	p = nm;
	491	while(1) {
	492	if((p2 = strchr(p, '/')) == NULL) {
	493	} else {
	494	*(p2++) = 0;
	495	}
	496
	497	if(!*p) {
	498	if(p2 == NULL) {
	499	if(stat(path, &sb)) {
	500	flog(LOG_WARNING, "failed to stat previously stated directory %s: %s", path, strerror(errno));
d422fdfd	501	simpleerror(fd, 500, "Internal Server Error", "The server encountered an unexpected condition.");
54cefaba FT	502	goto fail;
	503	}
	504	break;
	505	} else {
d422fdfd	506	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	507	goto fail;
	508	}
	509	}
d422fdfd FT	510	if(*p == '.') {
d422fdfd FT	511	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba	512	goto fail;
d422fdfd	513	}
54cefaba FT	514
	515	getconfig(path);
	516
	517	/*
	518	* First, check the name verbatimely:
	519	*/
	520	buf = sprintf3("%s/%s", path, p);
	521	if(!stat(buf, &sb)) {
	522	if(S_ISDIR(sb.st_mode)) {
	523	tmp = path;
	524	if(!strcmp(path, "."))
	525	path = sstrdup(p);
	526	else
	527	path = sprintf2("%s/%s", path, p);
	528	free(tmp);
	529	if(checkdir(req, fd, path))
	530	break;
	531	goto next;
	532	}
	533	if(S_ISREG(sb.st_mode)) {
	534	tmp = path;
	535	path = sprintf2("%s/%s", path, p);
	536	free(tmp);
	537	break;
	538	}
d422fdfd	539	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	540	goto fail;
	541	}
	542
	543	/*
	544	* Check the file extensionlessly:
	545	*/
	546	if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) {
	547	while((dent = readdir(dir)) != NULL) {
	548	buf = sprintf3("%s/%s", path, dent->d_name);
	549	if((p3 = strchr(dent->d_name, '.')) != NULL)
	550	*p3 = 0;
	551	if(strcmp(dent->d_name, p))
	552	continue;
	553	if(stat(buf, &sb))
	554	continue;
	555	if(!S_ISREG(sb.st_mode))
	556	continue;
	557	tmp = path;
	558	path = sstrdup(buf);
	559	free(tmp);
	560	break;
	561	}
	562	closedir(dir);
	563	if(dent != NULL)
	564	break;
	565	}
	566
d422fdfd	567	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	568	goto fail;
	569
	570	next:
	571	if(p2 == NULL)
	572	break;
	573	p = p2;
	574	}
	575	if(p2 == NULL)
	576	replrest(req, "");
	577	else
	578	replrest(req, p2);
	579	if(!strncmp(path, "./", 2))
	580	memmove(path, path + 2, strlen(path + 2) + 1);
	581	if(S_ISDIR(sb.st_mode)) {
	582	handledir(req, fd, path);
	583	} else if(S_ISREG(sb.st_mode)) {
	584	handlefile(req, fd, path);
	585	} else {
d422fdfd	586	simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource.");
54cefaba FT	587	goto fail;
	588	}
	589	goto out;
	590
	591	fail:
d422fdfd	592	/* No special handling, for now at least. */
54cefaba FT	593	out:
54cefaba FT	594	free(path);
992ce9ef FT	595	}
	596
	597	int main(int argc, char **argv)
	598	{
	599	struct hthead *req;
	600	int fd;
	601
	602	if(argc < 2) {
	603	flog(LOG_ERR, "usage: dirplex DIR");
	604	exit(1);
	605	}
	606	if(chdir(argv[1])) {
	607	flog(LOG_ERR, "could not change directory to %s: %s", argv[1], strerror(errno));
	608	exit(1);
	609	}
	610	signal(SIGCHLD, SIG_IGN);
	611	while(1) {
	612	if((fd = recvreq(0, &req)) < 0) {
	613	if(errno != 0)
	614	flog(LOG_ERR, "recvreq: %s", strerror(errno));
	615	break;
	616	}
	617	serve(req, fd);
	618	freehthead(req);
	619	close(fd);
	620	}
	621	return(0);
	622	}