[ashd.git] / lib / resp.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 <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include <regex.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <utils.h>
#include <resp.h>

static char safechars[128] = {
 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,
};

char *urlquote(char *text)
{
    static char *ret = NULL;
    struct charbuf buf;
    unsigned char c;
    
    if(ret != NULL)
	free(ret);
    bufinit(buf);
    for(; *text; text++) {
	c = *text;
	if(!c < 128 && safechars[(int)c])
	    bufadd(buf, *text);
	else
	    bprintf(&buf, "%%%02X", (int)c);
    }
    bufadd(buf, 0);
    return(ret = buf.b);
}

char *htmlquote(char *text)
{
    static char *ret = NULL;
    struct charbuf buf;
    
    if(ret != NULL)
	free(ret);
    bufinit(buf);
    for(; *text; text++) {
	if(*text == '<')
	    bufcatstr(buf, "&lt;");
	else if(*text == '>')
	    bufcatstr(buf, "&gt;");
	else if(*text == '&')
	    bufcatstr(buf, "&amp;");
	else if(*text == '\"')
	    bufcatstr(buf, "&quot;");
	else
	    bufadd(buf, *text);
    }
    bufadd(buf, 0);
    return(ret = buf.b);
}

static void simpleerror2v(FILE *out, int code, char *msg, char *fmt, va_list args)
{
    struct charbuf buf;
    char *tmp;
    
    tmp = vsprintf2(fmt, args);
    bufinit(buf);
    bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n");
    bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n");
    bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n");
    bufcatstr(buf, "<head>\r\n");
    bprintf(&buf, "<title>%s</title>\r\n", msg);
    bufcatstr(buf, "</head>\r\n");
    bufcatstr(buf, "<body>\r\n");
    bprintf(&buf, "<h1>%s</h1>\r\n", msg);
    bprintf(&buf, "<p>%s</p>\r\n", htmlquote(tmp));
    bufcatstr(buf, "</body>\r\n");
    bufcatstr(buf, "</html>\r\n");
    fprintf(out, "HTTP/1.1 %i %s\n", code, msg);
    fprintf(out, "Content-Type: text/html\n");
    fprintf(out, "Content-Length: %zi\n", buf.d);
    fprintf(out, "\n");
    fwrite(buf.b, 1, buf.d, out);
    buffree(buf);
    free(tmp);
}

void simpleerror2(FILE *out, int code, char *msg, char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    simpleerror2v(out, code, msg, fmt, args);
    va_end(args);
}

void simpleerror(int fd, int code, char *msg, char *fmt, ...)
{
    va_list args;
    FILE *out;

    va_start(args, fmt);
    out = fdopen(dup(fd), "w");
    simpleerror2v(out, code, msg, fmt, args);
    fclose(out);
    va_end(args);
}

void stdredir(struct hthead *req, int fd, int code, char *dst)
{
    FILE *out;
    char *sp, *cp, *ep, *qs, *path, *url, *adst, *proto, *host;
    
    sp = strchr(dst, '/');
    cp = strchr(dst, ':');
    if(cp && (!sp || (cp < sp))) {
	adst = sstrdup(dst);
    } else {
	proto = getheader(req, "X-Ash-Protocol");
	host = getheader(req, "Host");
	if((proto == NULL) || (host == NULL)) {
	    /* Not compliant, but there isn't a whole lot to be done
	     * about it. */
	    adst = sstrdup(dst);
	} else {
	    if(*dst == '/') {
		path = sstrdup(dst + 1);
	    } else {
		if((*(url = req->url)) == '/')
		    url++;
		if((ep = strchr(url, '?')) == NULL) {
		    ep = url + strlen(url);
		    qs = "";
		} else {
		    qs = ep;
		}
		for(; (ep > url) && (ep[-1] != '/'); ep--);
		path = sprintf2("%.*s%s%s", ep - url, url, dst, qs);
	    }
	    adst = sprintf2("%s://%s/%s", proto, host, path);
	    free(path);
	}
    }
    out = fdopen(dup(fd), "w");
    fprintf(out, "HTTP/1.1 %i Redirection\n", code);
    fprintf(out, "Content-Length: 0\n");
    fprintf(out, "Location: %s\n", adst);
    fprintf(out, "\n");
    fclose(out);
    free(adst);
}

char *fmthttpdate(time_t time)
{
    /* I avoid using strftime, since it depends on locale settings. */
    static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
    static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
			     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
    struct tm *tm;
    
    tm = gmtime(&time);
    return(sprintf3("%s, %i %s %i %02i:%02i:%02i GMT", days[(tm->tm_wday + 6) % 7], tm->tm_mday, months[tm->tm_mon], tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec));
}

time_t parsehttpdate(char *date)
{
    static regex_t *spec = NULL;
    static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
			     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
    int i;
    regmatch_t g[11];
    struct tm tm;
    int tz;
    
    int gtoi(regmatch_t g)
    {
	int i, n;

	for(i = g.rm_so, n = 0; i < g.rm_eo; i++)
	    n = (n * 10) + (date[i] - '0');
	return(n);
    }
    
    int gstrcmp(regmatch_t g, char *str) {
	if(g.rm_eo - g.rm_so != strlen(str))
	    return(1);
	return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so));
    }

    if(spec == NULL) {
	omalloc(spec);
	if(regcomp(spec, "^[A-Z]{3}, +([0-9]+) +([A-Z]{3}) +([0-9]+) +([0-9]{2}):([0-9]{2}):([0-9]{2}) +(([A-Z]+)|[+-]([0-9]{2})([0-9]{2}))$", REG_EXTENDED | REG_ICASE)) {
	    free(spec);
	    spec = NULL;
	    return(0);
	}
    }
    if(regexec(spec, date, 11, g, 0))
	return(0);
    tm.tm_mday = gtoi(g[1]);
    tm.tm_year = gtoi(g[3]) - 1900;
    tm.tm_hour = gtoi(g[4]);
    tm.tm_min = gtoi(g[5]);
    tm.tm_sec = gtoi(g[6]);
    
    tm.tm_mon = -1;
    for(i = 0; i < 12; i++) {
	if(!gstrcmp(g[2], months[i])) {
	    tm.tm_mon = i;
	    break;
	}
    }
    if(tm.tm_mon < 0)
	return(0);
    
    if(g[8].rm_so > 0) {
	if(!gstrcmp(g[8], "GMT"))
	    tz = 0;
	else
	    return(0);
    } else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) {
	tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60;
	if(date[g[7].rm_so] == '-')
	    tz = -tz;
    } else {
	return(0);
    }
    
    return(timegm(&tm) - tz);
}
Commit	Line	Data
d422fdfd 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>
ad1983c4	20	#include <unistd.h>
d422fdfd FT	21	#include <string.h>
	22	#include <stdio.h>
	23	#include <stdarg.h>
b4164ce6 FT	24	#include <time.h>
b4164ce6 FT	25	#include <regex.h>
d422fdfd FT	26
	27	#ifdef HAVE_CONFIG_H
	28	#include <config.h>
	29	#endif
	30	#include <utils.h>
	31	#include <resp.h>
	32
3095582d FT	33	static char safechars[128] = {
	34	/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
	35	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	36	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	37	0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
	38	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
	39	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	40	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
	41	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	42	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,
	43	};
	44
	45	char urlquote(char text)
	46	{
	47	static char *ret = NULL;
	48	struct charbuf buf;
	49	unsigned char c;
	50
	51	if(ret != NULL)
	52	free(ret);
	53	bufinit(buf);
	54	for(; *text; text++) {
	55	c = *text;
	56	if(!c < 128 && safechars[(int)c])
	57	bufadd(buf, *text);
	58	else
	59	bprintf(&buf, "%%%02X", (int)c);
	60	}
	61	bufadd(buf, 0);
	62	return(ret = buf.b);
	63	}
	64
d422fdfd FT	65	char htmlquote(char text)
d422fdfd FT	66	{
3095582d	67	static char *ret = NULL;
d422fdfd FT	68	struct charbuf buf;
d422fdfd FT	69
3095582d FT	70	if(ret != NULL)
3095582d FT	71	free(ret);
d422fdfd FT	72	bufinit(buf);
	73	for(; *text; text++) {
	74	if(*text == '<')
	75	bufcatstr(buf, "<");
	76	else if(*text == '>')
	77	bufcatstr(buf, ">");
	78	else if(*text == '&')
	79	bufcatstr(buf, "&");
3095582d FT	80	else if(*text == '\"')
3095582d FT	81	bufcatstr(buf, """);
d422fdfd FT	82	else
	83	bufadd(buf, *text);
	84	}
	85	bufadd(buf, 0);
3095582d	86	return(ret = buf.b);
d422fdfd FT	87	}
d422fdfd FT	88
65e8a9a0	89	static void simpleerror2v(FILE out, int code, char msg, char *fmt, va_list args)
d422fdfd FT	90	{
d422fdfd FT	91	struct charbuf buf;
3095582d	92	char *tmp;
d422fdfd	93
3095582d	94	tmp = vsprintf2(fmt, args);
d422fdfd FT	95	bufinit(buf);
	96	bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n");
	97	bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n");
	98	bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n");
	99	bufcatstr(buf, "<head>\r\n");
	100	bprintf(&buf, "<title>%s</title>\r\n", msg);
	101	bufcatstr(buf, "</head>\r\n");
	102	bufcatstr(buf, "<body>\r\n");
	103	bprintf(&buf, "<h1>%s</h1>\r\n", msg);
3095582d	104	bprintf(&buf, "<p>%s</p>\r\n", htmlquote(tmp));
d422fdfd FT	105	bufcatstr(buf, "</body>\r\n");
d422fdfd FT	106	bufcatstr(buf, "</html>\r\n");
81cfca6c FT	107	fprintf(out, "HTTP/1.1 %i %s\n", code, msg);
	108	fprintf(out, "Content-Type: text/html\n");
	109	fprintf(out, "Content-Length: %zi\n", buf.d);
	110	fprintf(out, "\n");
d422fdfd	111	fwrite(buf.b, 1, buf.d, out);
d422fdfd	112	buffree(buf);
51a4b1ad	113	free(tmp);
d422fdfd	114	}
b4164ce6	115
65e8a9a0 FT	116	void simpleerror2(FILE out, int code, char msg, char *fmt, ...)
	117	{
	118	va_list args;
	119
	120	va_start(args, fmt);
	121	simpleerror2v(out, code, msg, fmt, args);
	122	va_end(args);
	123	}
	124
	125	void simpleerror(int fd, int code, char msg, char fmt, ...)
	126	{
	127	va_list args;
	128	FILE *out;
	129
	130	va_start(args, fmt);
	131	out = fdopen(dup(fd), "w");
	132	simpleerror2v(out, code, msg, fmt, args);
	133	fclose(out);
	134	va_end(args);
	135	}
	136
46e66302 FT	137	void stdredir(struct hthead req, int fd, int code, char dst)
	138	{
	139	FILE *out;
c35bb77a	140	char sp, cp, ep, qs, path, url, adst, proto, *host;
46e66302 FT	141
	142	sp = strchr(dst, '/');
	143	cp = strchr(dst, ':');
	144	if(cp && (!sp \|\| (cp < sp))) {
	145	adst = sstrdup(dst);
	146	} else {
	147	proto = getheader(req, "X-Ash-Protocol");
	148	host = getheader(req, "Host");
	149	if((proto == NULL) \|\| (host == NULL)) {
	150	/* Not compliant, but there isn't a whole lot to be done
	151	* about it. */
	152	adst = sstrdup(dst);
	153	} else {
	154	if(*dst == '/') {
2f43c22d	155	path = sstrdup(dst + 1);
46e66302 FT	156	} else {
	157	if((*(url = req->url)) == '/')
	158	url++;
c35bb77a FT	159	if((ep = strchr(url, '?')) == NULL) {
	160	ep = url + strlen(url);
	161	qs = "";
	162	} else {
	163	qs = ep;
	164	}
	165	for(; (ep > url) && (ep[-1] != '/'); ep--);
	166	path = sprintf2("%.*s%s%s", ep - url, url, dst, qs);
46e66302 FT	167	}
	168	adst = sprintf2("%s://%s/%s", proto, host, path);
	169	free(path);
	170	}
	171	}
ad1983c4	172	out = fdopen(dup(fd), "w");
46e66302 FT	173	fprintf(out, "HTTP/1.1 %i Redirection\n", code);
	174	fprintf(out, "Content-Length: 0\n");
	175	fprintf(out, "Location: %s\n", adst);
	176	fprintf(out, "\n");
	177	fclose(out);
	178	free(adst);
	179	}
	180
b4164ce6 FT	181	char *fmthttpdate(time_t time)
	182	{
	183	/* I avoid using strftime, since it depends on locale settings. */
	184	static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
	185	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	186	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	187	struct tm *tm;
	188
	189	tm = gmtime(&time);
	190	return(sprintf3("%s, %i %s %i %02i:%02i:%02i GMT", days[(tm->tm_wday + 6) % 7], tm->tm_mday, months[tm->tm_mon], tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec));
	191	}
	192
	193	time_t parsehttpdate(char *date)
	194	{
	195	static regex_t *spec = NULL;
	196	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	197	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	198	int i;
	199	regmatch_t g[11];
	200	struct tm tm;
	201	int tz;
	202
	203	int gtoi(regmatch_t g)
	204	{
	205	int i, n;
	206
	207	for(i = g.rm_so, n = 0; i < g.rm_eo; i++)
	208	n = (n * 10) + (date[i] - '0');
	209	return(n);
	210	}
	211
	212	int gstrcmp(regmatch_t g, char *str) {
	213	if(g.rm_eo - g.rm_so != strlen(str))
	214	return(1);
	215	return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so));
	216	}
	217
	218	if(spec == NULL) {
	219	omalloc(spec);
	220	if(regcomp(spec, "^[A-Z]{3}, +([0-9]+) +([A-Z]{3}) +([0-9]+) +([0-9]{2}):([0-9]{2}):([0-9]{2}) +(([A-Z]+)\|[+-]([0-9]{2})([0-9]{2}))$", REG_EXTENDED \| REG_ICASE)) {
	221	free(spec);
	222	spec = NULL;
	223	return(0);
	224	}
	225	}
	226	if(regexec(spec, date, 11, g, 0))
	227	return(0);
	228	tm.tm_mday = gtoi(g[1]);
	229	tm.tm_year = gtoi(g[3]) - 1900;
	230	tm.tm_hour = gtoi(g[4]);
	231	tm.tm_min = gtoi(g[5]);
	232	tm.tm_sec = gtoi(g[6]);
	233
	234	tm.tm_mon = -1;
	235	for(i = 0; i < 12; i++) {
	236	if(!gstrcmp(g[2], months[i])) {
	237	tm.tm_mon = i;
	238	break;
	239	}
	240	}
	241	if(tm.tm_mon < 0)
	242	return(0);
	243
	244	if(g[8].rm_so > 0) {
245	if(!gstrcmp(g[8], "GMT"))
246	tz = 0;
247	else
248	return(0);
249	} else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) {
250	tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60;
251	if(date[g[7].rm_so] == '-')
252	tz = -tz;
253	} else {
254	return(0);
255	}
256
257	return(timegm(&tm) - tz);
258	}