[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;
    
    bufinit(name);
    bufinit(val);
    state = 0;
    while(1) {
	c = fgetc(in);
    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);
}

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;
	109
	110	bufinit(name);
	111	bufinit(val);
	112	state = 0;
	113	while(1) {
	114	c = fgetc(in);
	115	again:
	116	if(state == 0) {
	117	if(c == '\r') {
	118	} else if(c == '\n') {
	119	break;
	120	} else if(c == EOF) {
	121	goto fail;
	122	} else {
	123	state = 1;
	124	goto again;
	125	}
	126	} else if(state == 1) {
	127	if(c == ':') {
	128	trim(&name);
	129	bufadd(name, 0);
	130	state = 2;
	131	} else if(c == '\r') {
	132	} else if(c == '\n') {
	133	goto fail;
	134	} else if(c == EOF) {
	135	goto fail;
	136	} else {
	137	bufadd(name, c);
	138	}
	139	} else if(state == 2) {
	140	if(c == '\r') {
	141	} else if(c == '\n') {
	142	trim(&val);
	143	bufadd(val, 0);
	144	headappheader(head, name.b, val.b);
	145	buffree(name);
	146	buffree(val);
	147	state = 0;
	148	} else if(c == EOF) {
	149	goto fail;
	150	} else {
	151	bufadd(val, c);
	152	}
	153	}
	154	}
	155	return(0);
	156
	157	fail:
	158	buffree(name);
	159	buffree(val);
	160	return(-1);
	161	}
	162
9e9eca79 FT	163	void replrest(struct hthead head, char rest)
	164	{
	165	char *tmp;
	166
	167	/* Do not free the current rest string yet, so that the new one
5fc1bf9f	168	* can be taken from a subpart of the old one. */
9e9eca79 FT	169	tmp = head->rest;
	170	head->rest = sstrdup(rest);
	171	free(tmp);
	172	}
	173
41213112	174	void headpreheader(struct hthead head, const char name, const char *val)
33733396	175	{
41213112 FT	176	head->headers = srealloc(head->headers, sizeof(head->headers) (head->noheaders + 1));
	177	memmove(head->headers + 1, head->headers, sizeof(head->headers) head->noheaders);
	178	head->noheaders++;
	179	head->headers[0] = smalloc(sizeof(head->headers[0]) 2);
	180	head->headers[0][0] = sstrdup(name);
	181	head->headers[0][1] = sstrdup(val);
33733396 FT	182	}
33733396 FT	183
41213112	184	void headappheader(struct hthead head, const char name, const char *val)
33733396 FT	185	{
	186	int i;
	187
41213112 FT	188	i = head->noheaders++;
	189	head->headers = srealloc(head->headers, sizeof(head->headers) head->noheaders);
	190	head->headers[i] = smalloc(sizeof(head->headers[i]) 2);
	191	head->headers[i][0] = sstrdup(name);
	192	head->headers[i][1] = sstrdup(val);
	193	}
	194
f89ce57a FT	195	void headrmheader(struct hthead head, const char name)
	196	{
	197	int i;
	198
	199	for(i = 0; i < head->noheaders; i++) {
	200	if(!strcasecmp(head->headers[i][0], name)) {
	201	free(head->headers[i][0]);
	202	free(head->headers[i][1]);
	203	free(head->headers[i]);
608f4ac7	204	memmove(head->headers + i, head->headers + i + 1, sizeof(head->headers) * (--head->noheaders - i));
f89ce57a FT	205	return;
	206	}
	207	}
	208	}
	209
5fc1bf9f FT	210	int writeresp(FILE out, struct hthead resp)
	211	{
	212	int i;
	213
	214	if(fprintf(out, "%s %i %s\r\n", resp->ver, resp->code, resp->msg) < 0)
	215	return(-1);
	216	for(i = 0; i < resp->noheaders; i++) {
	217	if(fprintf(out, "%s: %s\r\n", resp->headers[i][0], resp->headers[i][1]) < 0)
	218	return(-1);
	219	}
	220	return(0);
	221	}
	222
af34331c	223	int sendreq(int sock, struct hthead *req, int fd)
41213112 FT	224	{
41213112 FT	225	int ret, i;
41213112 FT	226	struct charbuf buf;
41213112 FT	227
41213112 FT	228	bufinit(buf);
	229	bufcatstr2(buf, req->method);
	230	bufcatstr2(buf, req->url);
	231	bufcatstr2(buf, req->ver);
	232	bufcatstr2(buf, req->rest);
	233	for(i = 0; i < req->noheaders; i++) {
	234	bufcatstr2(buf, req->headers[i][0]);
	235	bufcatstr2(buf, req->headers[i][1]);
	236	}
	237	bufcatstr2(buf, "");
af34331c	238	ret = sendfd(sock, fd, buf.b, buf.d);
41213112	239	buffree(buf);
af34331c	240	if(ret < 0)
41213112	241	return(-1);
af34331c FT	242	else
af34331c FT	243	return(0);
41213112 FT	244	}
	245
	246	int recvreq(int sock, struct hthead **reqp)
	247	{
	248	int fd;
	249	struct charbuf buf;
	250	char *p;
	251	size_t l;
	252	char name, val;
	253	struct hthead *req;
	254
	255	if((fd = recvfd(sock, &buf.b, &buf.d)) < 0) {
	256	return(-1);
	257	}
470938bd	258	fcntl(fd, F_SETFD, FD_CLOEXEC);
41213112 FT	259	buf.s = buf.d;
	260	p = buf.b;
	261	l = buf.d;
	262
	263	*reqp = omalloc(req);
	264	if((req->method = sstrdup(decstr(&p, &l))) == NULL)
	265	goto fail;
	266	if((req->url = sstrdup(decstr(&p, &l))) == NULL)
	267	goto fail;
	268	if((req->ver = sstrdup(decstr(&p, &l))) == NULL)
	269	goto fail;
	270	if((req->rest = sstrdup(decstr(&p, &l))) == NULL)
	271	goto fail;
	272
	273	while(1) {
	274	if(!*(name = decstr(&p, &l)))
	275	break;
	276	val = decstr(&p, &l);
	277	headappheader(req, name, val);
	278	}
	279
	280	buffree(buf);
	281	return(fd);
	282
	283	fail:
	284	close(fd);
	285	freehthead(req);
	286	errno = EPROTO;
	287	return(-1);
33733396	288	}
1604c096 FT	289
	290	char unquoteurl(char in)
	291	{
	292	struct charbuf buf;
	293	char *p;
	294	int c;
	295
	296	bufinit(buf);
	297	p = in;
	298	while(*p) {
	299	if(*p == '%') {
	300	if(!p[1] \|\| !p[2])
	301	goto fail;
	302	c = 0;
	303	if((p[1] >= '0') && (p[1] <= '9')) c \|= (p[1] - '0') << 4;
	304	else if((p[1] >= 'a') && (p[1] <= 'f')) c \|= (p[1] - 'a' + 10) << 4;
	305	else if((p[1] >= 'A') && (p[1] <= 'F')) c \|= (p[1] - 'A' + 10) << 4;
	306	else goto fail;
	307	if((p[2] >= '0') && (p[2] <= '9')) c \|= (p[2] - '0');
	308	else if((p[2] >= 'a') && (p[2] <= 'f')) c \|= (p[2] - 'a' + 10);
	309	else if((p[2] >= 'A') && (p[2] <= 'F')) c \|= (p[2] - 'A' + 10);
	310	else goto fail;
	311	bufadd(buf, c);
	312	p += 3;
	313	} else {
	314	bufadd(buf, *(p++));
	315	}
	316	}
	317	bufadd(buf, 0);
	318	return(buf.b);
	319	fail:
	320	buffree(buf);
	321	return(NULL);
	322	}