[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 <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>

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

void simpleerror(int fd, int code, char *msg, char *fmt, ...)
{
    struct charbuf buf;
    char *tmp1, *tmp2;
    va_list args;
    FILE *out;
    
    va_start(args, fmt);
    tmp1 = vsprintf2(fmt, args);
    va_end(args);
    tmp2 = htmlquote(tmp1);
    free(tmp1);
    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", tmp2);
    bufcatstr(buf, "</body>\r\n");
    bufcatstr(buf, "</html>\r\n");
    free(tmp2);
    out = fdopen(fd, "w");
    fprintf(out, "HTTP/1.1 %i %s\r\n", code, msg);
    fprintf(out, "Content-Type: text/html\r\n");
    fprintf(out, "Content-Length: %i\r\n", buf.d);
    fprintf(out, "\r\n");
    fwrite(buf.b, 1, buf.d, out);
    fclose(out);
    buffree(buf);
}

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
	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 <string.h>
	21	#include <stdio.h>
	22	#include <stdarg.h>
	23	#include <time.h>
	24	#include <regex.h>
	25
	26	#ifdef HAVE_CONFIG_H
	27	#include <config.h>
	28	#endif
	29	#include <utils.h>
	30	#include <resp.h>
	31
	32	char htmlquote(char text)
	33	{
	34	struct charbuf buf;
	35
	36	bufinit(buf);
	37	for(; *text; text++) {
	38	if(*text == '<')
	39	bufcatstr(buf, "<");
	40	else if(*text == '>')
	41	bufcatstr(buf, ">");
	42	else if(*text == '&')
	43	bufcatstr(buf, "&");
	44	else
	45	bufadd(buf, *text);
	46	}
	47	bufadd(buf, 0);
	48	return(buf.b);
	49	}
	50
	51	void simpleerror(int fd, int code, char msg, char fmt, ...)
	52	{
	53	struct charbuf buf;
	54	char tmp1, tmp2;
	55	va_list args;
	56	FILE *out;
	57
	58	va_start(args, fmt);
	59	tmp1 = vsprintf2(fmt, args);
	60	va_end(args);
	61	tmp2 = htmlquote(tmp1);
	62	free(tmp1);
	63	bufinit(buf);
	64	bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n");
	65	bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n");
	66	bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n");
	67	bufcatstr(buf, "<head>\r\n");
	68	bprintf(&buf, "<title>%s</title>\r\n", msg);
	69	bufcatstr(buf, "</head>\r\n");
	70	bufcatstr(buf, "<body>\r\n");
	71	bprintf(&buf, "<h1>%s</h1>\r\n", msg);
	72	bprintf(&buf, "<p>%s</p>\r\n", tmp2);
	73	bufcatstr(buf, "</body>\r\n");
	74	bufcatstr(buf, "</html>\r\n");
	75	free(tmp2);
	76	out = fdopen(fd, "w");
	77	fprintf(out, "HTTP/1.1 %i %s\r\n", code, msg);
	78	fprintf(out, "Content-Type: text/html\r\n");
	79	fprintf(out, "Content-Length: %i\r\n", buf.d);
	80	fprintf(out, "\r\n");
	81	fwrite(buf.b, 1, buf.d, out);
	82	fclose(out);
	83	buffree(buf);
	84	}
	85
	86	char *fmthttpdate(time_t time)
	87	{
	88	/* I avoid using strftime, since it depends on locale settings. */
	89	static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
	90	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	91	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	92	struct tm *tm;
	93
	94	tm = gmtime(&time);
	95	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));
	96	}
	97
	98	time_t parsehttpdate(char *date)
	99	{
	100	static regex_t *spec = NULL;
	101	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	102	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	103	int i;
	104	regmatch_t g[11];
	105	struct tm tm;
	106	int tz;
	107
	108	int gtoi(regmatch_t g)
	109	{
	110	int i, n;
	111
	112	for(i = g.rm_so, n = 0; i < g.rm_eo; i++)
	113	n = (n * 10) + (date[i] - '0');
	114	return(n);
	115	}
	116
	117	int gstrcmp(regmatch_t g, char *str) {
	118	if(g.rm_eo - g.rm_so != strlen(str))
	119	return(1);
	120	return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so));
	121	}
	122
	123	if(spec == NULL) {
	124	omalloc(spec);
	125	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)) {
	126	free(spec);
	127	spec = NULL;
	128	return(0);
	129	}
	130	}
	131	if(regexec(spec, date, 11, g, 0))
	132	return(0);
	133	tm.tm_mday = gtoi(g[1]);
	134	tm.tm_year = gtoi(g[3]) - 1900;
	135	tm.tm_hour = gtoi(g[4]);
	136	tm.tm_min = gtoi(g[5]);
	137	tm.tm_sec = gtoi(g[6]);
	138
	139	tm.tm_mon = -1;
	140	for(i = 0; i < 12; i++) {
	141	if(!gstrcmp(g[2], months[i])) {
	142	tm.tm_mon = i;
	143	break;
	144	}
	145	}
	146	if(tm.tm_mon < 0)
	147	return(0);
	148
	149	if(g[8].rm_so > 0) {
	150	if(!gstrcmp(g[8], "GMT"))
	151	tz = 0;
	152	else
	153	return(0);
	154	} else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) {
	155	tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60;
	156	if(date[g[7].rm_so] == '-')
	157	tz = -tz;
	158	} else {
	159	return(0);
	160	}
	161
	162	return(timegm(&tm) - tz);
	163	}