[ashd.git] / lib / req.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 <unistd.h>
#include <sys/socket.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <fcntl.h>

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

struct hthead *mkreq(char *method, char *url, char *ver)
{
    struct hthead *req;
    
    omalloc(req);
    req->method = sstrdup(method);
    req->url = sstrdup(url);
    req->ver = sstrdup(ver);
    req->rest = sstrdup(url);
    return(req);
}

struct hthead *mkresp(int code, char *msg, char *ver)
{
    struct hthead *resp;
    
    omalloc(resp);
    resp->code = code;
    resp->msg = sstrdup(msg);
    resp->ver = sstrdup(ver);
    return(resp);
}

void freehthead(struct hthead *head)
{
    int i;
    
    if(head->method != NULL)
	free(head->method);
    if(head->url != NULL)
	free(head->url);
    if(head->msg != NULL)
	free(head->msg);
    if(head->ver != NULL)
	free(head->ver);
    if(head->rest != NULL)
	free(head->rest);
    if(head->headers) {
	for(i = 0; i < head->noheaders; i++) {
	    free(head->headers[i][0]);
	    free(head->headers[i][1]);
	    free(head->headers[i]);
	}
	free(head->headers);
    }
    free(head);
}

char *getheader(struct hthead *head, char *name)
{
    int i;
    
    for(i = 0; i < head->noheaders; i++) {
	if(!strcasecmp(head->headers[i][0], name))
	    return(head->headers[i][1]);
    }
    return(NULL);
}

static void trim(struct charbuf *buf)
{
    char *p;
    
    for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++);
    memmove(buf->b, p, buf->d -= (p - buf->b));
    if(buf->d > 0)
	for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--);
}

int parseheaders(struct hthead *head, FILE *in)
{
    int c, state;
    struct charbuf name, val;
    size_t tsz;
    
    bufinit(name);
    bufinit(val);
    state = 0;
    tsz = 0;
    while(1) {
	c = fgetc(in);
	if(++tsz >= 65536)
	    goto fail;
    again:
	if(state == 0) {
	    if(c == '\r') {
	    } else if(c == '\n') {
		break;
	    } else if(c == EOF) {
		goto fail;
	    } else {
		state = 1;
		goto again;
	    }
	} else if(state == 1) {
	    if(c == ':') {
		trim(&name);
		bufadd(name, 0);
		state = 2;
	    } else if(c == '\r') {
	    } else if(c == '\n') {
		goto fail;
	    } else if(c == EOF) {
		goto fail;
	    } else {
		bufadd(name, c);
	    }
	} else if(state == 2) {
	    if(c == '\r') {
	    } else if(c == '\n') {
		trim(&val);
		bufadd(val, 0);
		headappheader(head, name.b, val.b);
		buffree(name);
		buffree(val);
		state = 0;
	    } else if(c == EOF) {
		goto fail;
	    } else {
		bufadd(val, c);
	    }
	}
    }
    return(0);
    
fail:
    buffree(name);
    buffree(val);
    return(-1);
}

struct hthead *parseresponse(FILE *in)
{
    struct hthead *req;
    int code;
    struct charbuf ver, msg;
    int c;
    
    req = NULL;
    bufinit(ver);
    bufinit(msg);
    code = 0;
    while(1) {
	c = getc(in);
	if(c == ' ') {
	    break;
	} else if((c == EOF) || (c < 32) || (c >= 128)) {
	    goto fail;
	} else {
	    bufadd(ver, c);
	    if(ver.d >= 128)
		goto fail;
	}
    }
    while(1) {
	c = getc(in);
	if(c == ' ') {
	    break;
	} else if((c == EOF) || (c < '0') || (c > '9')) {
	    goto fail;
	} else {
	    code = (code * 10) + (c - '0');
	    if(code >= 10000)
		goto fail;
	}
    }
    while(1) {
	c = getc(in);
	if(c == 10) {
	    break;
	} else if(c == 13) {
	} else if((c == EOF) || (c < 32)) {
	    goto fail;
	} else {
	    bufadd(msg, c);
	    if(msg.d >= 512)
		goto fail;
	}
    }
    bufadd(msg, 0);
    bufadd(ver, 0);
    req = mkresp(code, msg.b, ver.b);
    if(parseheaders(req, in))
	goto fail;
    goto out;
    
fail:
    if(req != NULL) {
	freehthead(req);
	req = NULL;
    }
out:
    buffree(msg);
    buffree(ver);
    return(req);
}

void replrest(struct hthead *head, char *rest)
{
    char *tmp;
    
    /* Do not free the current rest string yet, so that the new one
     * can be taken from a subpart of the old one. */
    tmp = head->rest;
    head->rest = sstrdup(rest);
    free(tmp);
}

void headpreheader(struct hthead *head, const char *name, const char *val)
{
    head->headers = srealloc(head->headers, sizeof(*head->headers) * (head->noheaders + 1));
    memmove(head->headers + 1, head->headers, sizeof(*head->headers) * head->noheaders);
    head->noheaders++;
    head->headers[0] = smalloc(sizeof(*head->headers[0]) * 2);
    head->headers[0][0] = sstrdup(name);
    head->headers[0][1] = sstrdup(val);
}

void headappheader(struct hthead *head, const char *name, const char *val)
{
    int i;

    i = head->noheaders++;
    head->headers = srealloc(head->headers, sizeof(*head->headers) * head->noheaders);
    head->headers[i] = smalloc(sizeof(*head->headers[i]) * 2);
    head->headers[i][0] = sstrdup(name);
    head->headers[i][1] = sstrdup(val);
}

void headrmheader(struct hthead *head, const char *name)
{
    int i;
    
    for(i = 0; i < head->noheaders; i++) {
	if(!strcasecmp(head->headers[i][0], name)) {
	    free(head->headers[i][0]);
	    free(head->headers[i][1]);
	    free(head->headers[i]);
	    memmove(head->headers + i, head->headers + i + 1, sizeof(head->headers) * (--head->noheaders - i));
	    return;
	}
    }
}

int writeresp(FILE *out, struct hthead *resp)
{
    int i;
    
    if(fprintf(out, "%s %i %s\r\n", resp->ver, resp->code, resp->msg) < 0)
	return(-1);
    for(i = 0; i < resp->noheaders; i++) {
	if(fprintf(out, "%s: %s\r\n", resp->headers[i][0], resp->headers[i][1]) < 0)
	    return(-1);
    }
    return(0);
}

int sendreq(int sock, struct hthead *req, int fd)
{
    int ret, i;
    struct charbuf buf;
    
    bufinit(buf);
    bufcatstr2(buf, req->method);
    bufcatstr2(buf, req->url);
    bufcatstr2(buf, req->ver);
    bufcatstr2(buf, req->rest);
    for(i = 0; i < req->noheaders; i++) {
	bufcatstr2(buf, req->headers[i][0]);
	bufcatstr2(buf, req->headers[i][1]);
    }
    bufcatstr2(buf, "");
    ret = sendfd(sock, fd, buf.b, buf.d);
    buffree(buf);
    if(ret < 0)
	return(-1);
    else
	return(0);
}

int recvreq(int sock, struct hthead **reqp)
{
    int fd;
    struct charbuf buf;
    char *p;
    size_t l;
    char *name, *val;
    struct hthead *req;
    
    if((fd = recvfd(sock, &buf.b, &buf.d)) < 0) {
	return(-1);
    }
    fcntl(fd, F_SETFD, FD_CLOEXEC);
    buf.s = buf.d;
    p = buf.b;
    l = buf.d;
    
    *reqp = omalloc(req);
    if((req->method = sstrdup(decstr(&p, &l))) == NULL)
	goto fail;
    if((req->url = sstrdup(decstr(&p, &l))) == NULL)
	goto fail;
    if((req->ver = sstrdup(decstr(&p, &l))) == NULL)
	goto fail;
    if((req->rest = sstrdup(decstr(&p, &l))) == NULL)
	goto fail;
    
    while(1) {
	if(!*(name = decstr(&p, &l)))
	    break;
	val = decstr(&p, &l);
	headappheader(req, name, val);
    }
    
    buffree(buf);
    return(fd);
    
fail:
    close(fd);
    freehthead(req);
    errno = EPROTO;
    return(-1);
}

char *unquoteurl(char *in)
{
    struct charbuf buf;
    char *p;
    int c;
    
    bufinit(buf);
    p = in;
    while(*p) {
	if(*p == '%') {
	    if(!p[1] || !p[2])
		goto fail;
	    c = 0;
	    if((p[1] >= '0') && (p[1] <= '9'))          c |= (p[1] - '0') << 4;
	    else if((p[1] >= 'a') && (p[1] <= 'f'))     c |= (p[1] - 'a' + 10) << 4;
	    else if((p[1] >= 'A') && (p[1] <= 'F'))     c |= (p[1] - 'A' + 10) << 4;
	    else                                        goto fail;
	    if((p[2] >= '0') && (p[2] <= '9'))          c |= (p[2] - '0');
	    else if((p[2] >= 'a') && (p[2] <= 'f'))     c |= (p[2] - 'a' + 10);
	    else if((p[2] >= 'A') && (p[2] <= 'F'))     c |= (p[2] - 'A' + 10);
	    else                                        goto fail;
	    bufadd(buf, c);
	    p += 3;
	} else {
	    bufadd(buf, *(p++));
	}
    }
    bufadd(buf, 0);
    return(buf.b);
fail:
    buffree(buf);
    return(NULL);
}
Commit	Line	Data
33733396 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 <string.h>
41213112 FT	21	#include <unistd.h>
	22	#include <sys/socket.h>
	23	#include <errno.h>
5fc1bf9f FT	24	#include <ctype.h>
5fc1bf9f FT	25	#include <stdio.h>
470938bd	26	#include <fcntl.h>
33733396 FT	27
	28	#ifdef HAVE_CONFIG_H
	29	#include <config.h>
	30	#endif
	31	#include <utils.h>
41213112	32	#include <log.h>
33733396	33	#include <req.h>
41213112	34	#include <proc.h>
33733396	35
41213112	36	struct hthead mkreq(char method, char url, char ver)
33733396	37	{
41213112	38	struct hthead *req;
33733396 FT	39
	40	omalloc(req);
	41	req->method = sstrdup(method);
	42	req->url = sstrdup(url);
	43	req->ver = sstrdup(ver);
41213112	44	req->rest = sstrdup(url);
33733396 FT	45	return(req);
	46	}
	47
41213112 FT	48	struct hthead mkresp(int code, char msg, char *ver)
	49	{
	50	struct hthead *resp;
	51
	52	omalloc(resp);
	53	resp->code = code;
	54	resp->msg = sstrdup(msg);
	55	resp->ver = sstrdup(ver);
	56	return(resp);
	57	}
	58
	59	void freehthead(struct hthead *head)
33733396 FT	60	{
	61	int i;
	62
41213112 FT	63	if(head->method != NULL)
	64	free(head->method);
	65	if(head->url != NULL)
	66	free(head->url);
	67	if(head->msg != NULL)
	68	free(head->msg);
	69	if(head->ver != NULL)
	70	free(head->ver);
	71	if(head->rest != NULL)
	72	free(head->rest);
	73	if(head->headers) {
	74	for(i = 0; i < head->noheaders; i++) {
	75	free(head->headers[i][0]);
	76	free(head->headers[i][1]);
	77	free(head->headers[i]);
33733396	78	}
41213112	79	free(head->headers);
33733396	80	}
41213112	81	free(head);
33733396 FT	82	}
33733396 FT	83
41213112	84	char getheader(struct hthead head, char *name)
66987955 FT	85	{
	86	int i;
	87
41213112 FT	88	for(i = 0; i < head->noheaders; i++) {
	89	if(!strcasecmp(head->headers[i][0], name))
	90	return(head->headers[i][1]);
66987955 FT	91	}
	92	return(NULL);
	93	}
	94
5fc1bf9f FT	95	static void trim(struct charbuf *buf)
	96	{
	97	char *p;
	98
a39d9e16 FT	99	for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++);
	100	memmove(buf->b, p, buf->d -= (p - buf->b));
	101	if(buf->d > 0)
c7b1ef35	102	for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--);
5fc1bf9f FT	103	}
	104
	105	int parseheaders(struct hthead head, FILE in)
	106	{
	107	int c, state;
	108	struct charbuf name, val;
90b0ba0f	109	size_t tsz;
5fc1bf9f FT	110
	111	bufinit(name);
	112	bufinit(val);
	113	state = 0;
90b0ba0f	114	tsz = 0;
5fc1bf9f FT	115	while(1) {
5fc1bf9f FT	116	c = fgetc(in);
90b0ba0f FT	117	if(++tsz >= 65536)
90b0ba0f FT	118	goto fail;
5fc1bf9f FT	119	again:
	120	if(state == 0) {
	121	if(c == '\r') {
	122	} else if(c == '\n') {
	123	break;
	124	} else if(c == EOF) {
	125	goto fail;
	126	} else {
	127	state = 1;
	128	goto again;
	129	}
	130	} else if(state == 1) {
	131	if(c == ':') {
	132	trim(&name);
	133	bufadd(name, 0);
	134	state = 2;
	135	} else if(c == '\r') {
	136	} else if(c == '\n') {
	137	goto fail;
	138	} else if(c == EOF) {
	139	goto fail;
	140	} else {
	141	bufadd(name, c);
	142	}
	143	} else if(state == 2) {
	144	if(c == '\r') {
	145	} else if(c == '\n') {
	146	trim(&val);
	147	bufadd(val, 0);
	148	headappheader(head, name.b, val.b);
	149	buffree(name);
	150	buffree(val);
	151	state = 0;
	152	} else if(c == EOF) {
	153	goto fail;
	154	} else {
	155	bufadd(val, c);
	156	}
	157	}
	158	}
	159	return(0);
	160
	161	fail:
	162	buffree(name);
	163	buffree(val);
	164	return(-1);
	165	}
	166
3ef78895 FT	167	struct hthead parseresponse(FILE in)
	168	{
	169	struct hthead *req;
	170	int code;
	171	struct charbuf ver, msg;
	172	int c;
	173
	174	req = NULL;
	175	bufinit(ver);
	176	bufinit(msg);
	177	code = 0;
	178	while(1) {
	179	c = getc(in);
	180	if(c == ' ') {
	181	break;
	182	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
	183	goto fail;
	184	} else {
	185	bufadd(ver, c);
	186	if(ver.d >= 128)
	187	goto fail;
	188	}
	189	}
	190	while(1) {
	191	c = getc(in);
	192	if(c == ' ') {
	193	break;
	194	} else if((c == EOF) \|\| (c < '0') \|\| (c > '9')) {
	195	goto fail;
	196	} else {
	197	code = (code * 10) + (c - '0');
	198	if(code >= 10000)
	199	goto fail;
	200	}
	201	}
	202	while(1) {
	203	c = getc(in);
	204	if(c == 10) {
	205	break;
	206	} else if(c == 13) {
	207	} else if((c == EOF) \|\| (c < 32)) {
	208	goto fail;
	209	} else {
	210	bufadd(msg, c);
	211	if(msg.d >= 512)
	212	goto fail;
	213	}
	214	}
	215	bufadd(msg, 0);
	216	bufadd(ver, 0);
	217	req = mkresp(code, msg.b, ver.b);
	218	if(parseheaders(req, in))
	219	goto fail;
	220	goto out;
	221
	222	fail:
	223	if(req != NULL) {
	224	freehthead(req);
	225	req = NULL;
	226	}
	227	out:
	228	buffree(msg);
	229	buffree(ver);
	230	return(req);
231	}
232
9e9eca79 FT	233	void replrest(struct hthead head, char rest)
	234	{
	235	char *tmp;
	236
	237	/* Do not free the current rest string yet, so that the new one
5fc1bf9f	238	* can be taken from a subpart of the old one. */
9e9eca79 FT	239	tmp = head->rest;
	240	head->rest = sstrdup(rest);
	241	free(tmp);
	242	}
	243
41213112	244	void headpreheader(struct hthead head, const char name, const char *val)
33733396	245	{
41213112 FT	246	head->headers = srealloc(head->headers, sizeof(head->headers) (head->noheaders + 1));
	247	memmove(head->headers + 1, head->headers, sizeof(head->headers) head->noheaders);
	248	head->noheaders++;
	249	head->headers[0] = smalloc(sizeof(head->headers[0]) 2);
	250	head->headers[0][0] = sstrdup(name);
	251	head->headers[0][1] = sstrdup(val);
33733396 FT	252	}
33733396 FT	253
41213112	254	void headappheader(struct hthead head, const char name, const char *val)
33733396 FT	255	{
	256	int i;
	257
41213112 FT	258	i = head->noheaders++;
	259	head->headers = srealloc(head->headers, sizeof(head->headers) head->noheaders);
	260	head->headers[i] = smalloc(sizeof(head->headers[i]) 2);
	261	head->headers[i][0] = sstrdup(name);
	262	head->headers[i][1] = sstrdup(val);
	263	}
	264
f89ce57a FT	265	void headrmheader(struct hthead head, const char name)
	266	{
	267	int i;
	268
	269	for(i = 0; i < head->noheaders; i++) {
	270	if(!strcasecmp(head->headers[i][0], name)) {
	271	free(head->headers[i][0]);
	272	free(head->headers[i][1]);
	273	free(head->headers[i]);
608f4ac7	274	memmove(head->headers + i, head->headers + i + 1, sizeof(head->headers) * (--head->noheaders - i));
f89ce57a FT	275	return;
	276	}
	277	}
	278	}
	279
5fc1bf9f FT	280	int writeresp(FILE out, struct hthead resp)
	281	{
	282	int i;
	283
	284	if(fprintf(out, "%s %i %s\r\n", resp->ver, resp->code, resp->msg) < 0)
	285	return(-1);
	286	for(i = 0; i < resp->noheaders; i++) {
	287	if(fprintf(out, "%s: %s\r\n", resp->headers[i][0], resp->headers[i][1]) < 0)
	288	return(-1);
	289	}
	290	return(0);
	291	}
	292
af34331c	293	int sendreq(int sock, struct hthead *req, int fd)
41213112 FT	294	{
41213112 FT	295	int ret, i;
41213112 FT	296	struct charbuf buf;
41213112 FT	297
41213112 FT	298	bufinit(buf);
	299	bufcatstr2(buf, req->method);
	300	bufcatstr2(buf, req->url);
	301	bufcatstr2(buf, req->ver);
	302	bufcatstr2(buf, req->rest);
	303	for(i = 0; i < req->noheaders; i++) {
	304	bufcatstr2(buf, req->headers[i][0]);
	305	bufcatstr2(buf, req->headers[i][1]);
	306	}
	307	bufcatstr2(buf, "");
af34331c	308	ret = sendfd(sock, fd, buf.b, buf.d);
41213112	309	buffree(buf);
af34331c	310	if(ret < 0)
41213112	311	return(-1);
af34331c FT	312	else
af34331c FT	313	return(0);
41213112 FT	314	}
	315
	316	int recvreq(int sock, struct hthead **reqp)
	317	{
	318	int fd;
	319	struct charbuf buf;
	320	char *p;
	321	size_t l;
	322	char name, val;
	323	struct hthead *req;
	324
	325	if((fd = recvfd(sock, &buf.b, &buf.d)) < 0) {
	326	return(-1);
	327	}
470938bd	328	fcntl(fd, F_SETFD, FD_CLOEXEC);
41213112 FT	329	buf.s = buf.d;
	330	p = buf.b;
	331	l = buf.d;
	332
	333	*reqp = omalloc(req);
	334	if((req->method = sstrdup(decstr(&p, &l))) == NULL)
	335	goto fail;
	336	if((req->url = sstrdup(decstr(&p, &l))) == NULL)
	337	goto fail;
	338	if((req->ver = sstrdup(decstr(&p, &l))) == NULL)
	339	goto fail;
	340	if((req->rest = sstrdup(decstr(&p, &l))) == NULL)
	341	goto fail;
	342
	343	while(1) {
	344	if(!*(name = decstr(&p, &l)))
	345	break;
	346	val = decstr(&p, &l);
	347	headappheader(req, name, val);
	348	}
	349
	350	buffree(buf);
	351	return(fd);
	352
	353	fail:
	354	close(fd);
	355	freehthead(req);
	356	errno = EPROTO;
	357	return(-1);
33733396	358	}
1604c096 FT	359
	360	char unquoteurl(char in)
	361	{
	362	struct charbuf buf;
	363	char *p;
	364	int c;
	365
	366	bufinit(buf);
	367	p = in;
	368	while(*p) {
	369	if(*p == '%') {
	370	if(!p[1] \|\| !p[2])
	371	goto fail;
	372	c = 0;
	373	if((p[1] >= '0') && (p[1] <= '9')) c \|= (p[1] - '0') << 4;
	374	else if((p[1] >= 'a') && (p[1] <= 'f')) c \|= (p[1] - 'a' + 10) << 4;
	375	else if((p[1] >= 'A') && (p[1] <= 'F')) c \|= (p[1] - 'A' + 10) << 4;
	376	else goto fail;
	377	if((p[2] >= '0') && (p[2] <= '9')) c \|= (p[2] - '0');
	378	else if((p[2] >= 'a') && (p[2] <= 'f')) c \|= (p[2] - 'a' + 10);
	379	else if((p[2] >= 'A') && (p[2] <= 'F')) c \|= (p[2] - 'A' + 10);
	380	else goto fail;
	381	bufadd(buf, c);
	382	p += 3;
	383	} else {
	384	bufadd(buf, *(p++));
	385	}
	386	}
	387	bufadd(buf, 0);
	388	return(buf.b);
	389	fail:
	390	buffree(buf);
	391	return(NULL);
	392	}