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libhttp.c
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libhttp.c
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#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <event.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <strings.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <glib.h>
#include "libhttp.h"
//#define DEBUG
#ifdef DEBUG
#define Dprintf printf
#else
#define Dprintf( a... )
#endif
int http_get_cmd(char *cmd) {
if (strcasecmp("GET", cmd) == 0)
return HC_CMD_GET;
if (strcasecmp("POST", cmd) == 0)
return HC_CMD_POST;
if (strcasecmp("HEAD", cmd) == 0)
return HC_CMD_HEAD;
return HC_CMD_UNKNOWN;
}
/* Split line into string elements seperated by space or tab */
static int split_string_by_space(char *input, char **elem, int max) {
int no;
char *i=input;
for(no=0;no<max;) {
/* Skip space or tab */
while(*i == ' ' || *i == '\t' || *i == '\r' || *i == '\n')
*i++=0x0;
if(*i == 0x0)
break;
/* Store pointer */
elem[no++]=i;
/* Skip non space */
while(*i != ' ' && *i != '\t' && *i != 0x0)
i++;
/* End of String ? */
if(*i == 0x0)
break;
}
return no;
}
/*
* Parse a string like HTTP/1.0 or HTTP/1.1 and return
* the protocol and version
*
*
* HP_UNKNOWN - Unknown protocol
* HP_HTTP - Seems to be HTTP without/with broken/with unknown version
* HP_HTTP10 - HTTP/1.0
* HP_HTTP11 - HTTP/1.1
*
*/
static int http_parse_proto(char *pstr) {
char *pver, *dotptr, *endptr;
int major, minor;
/* Check if we are dealing with HTTP */
if (strncasecmp(pstr, "HTTP", 4) != 0)
return HP_UNKNOWN;
pver=strchr(pstr, '/');
if (!pver)
return HP_HTTP;
major=strtol(++pver, &dotptr, 10);
/* 1.0 or 1.1 */
if (*dotptr != '.')
return HP_HTTP;
minor=strtol(++dotptr, &endptr, 10);
/* String should end after [major].[minor] */
if (*endptr != 0x0)
return HP_HTTP;
Dprintf("%s: major %d minor %d\n", __FUNCTION__, major, minor);
if (major == 1 && minor == 0)
return HP_HTTP10;
if (major == 1 && minor == 1)
return HP_HTTP11;
return HP_HTTP;
}
/*
* Read the first line - PUT/GET/POST etc ...
*
* GET <url> HTTP/<version>
*
*/
static int http_parse_command_url(struct http_connection *hc, struct evbuffer *input) {
char *p=(char *) EVBUFFER_DATA(input);
char *elem[10];
int no;
no=split_string_by_space(p, elem, 10);
/* Need "CMD URL PROTO/VERSION" which makes it 3 parms */
if (no != 3)
return 0;
if ((hc->cmd=http_get_cmd(elem[0])) == HC_CMD_UNKNOWN)
return 0;
hc->url=strdup(elem[1]);
hc->proto=http_parse_proto(elem[2]);
if (hc->proto == HP_HTTP11)
hc->keepalive=1;
else
hc->keepalive=0;
return 1;
}
static int http_parse_attrib(struct http_connection *hc, struct evbuffer *input) {
char *p=(char *) EVBUFFER_DATA(input);
struct http_attrib *ha;
char *token, *value;
token=p;
while(*p != ':' && *p != ' ' && *p != 0x0)
p++;
/* Did we find the colon as delimiter ?
* If not something went really wrong - terminate the connection
*/
if (*p == ':')
*p++=0x0;
else
return 0;
while(*p == ' ' || *p == '\t')
p++;
value=p;
ha=malloc(sizeof(struct http_attrib));
ha->token=strdup(token);
ha->value=strdup(value);
hc->attrib=g_list_append(hc->attrib, ha);
Dprintf("%s: %s %s\n", __FUNCTION__, token, value);
return 1;
}
/*
* HTTP/1.1 404 Not Found
* Date: Wed, 17 May 2006 17:33:00 GMT
* Server: Apache/2.0.54 (Debian GNU/Linux)
* Content-Length: 310
* Connection: close
* Content-Type: text/html; charset=iso-8859-1
*
*/
static char *http_static_msg_404 =
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\"> \
<html><head> \
<title>404 Not Found</title> \
</head><body> \
<h1>404 Not Found</h1> \
</body> \
</html>";
int http_url_handler_404(struct http_connection *hc, int cbtype, void *arg) {
int err;
Dprintf("%s: cbtype %d\n", __FUNCTION__, cbtype);
/* Answer with 404 page on QUERY */
if (cbtype == HCB_QUERY) {
err=http_return_simple(hc,
"404 Not found",
"text/html",
http_static_msg_404,
strlen(http_static_msg_404));
return 1;
}
/*
* Drop connection if socket gets writeable again
* or we have an error
*/
http_request_end(hc);
return 1;
}
size_t http_get_queue(struct http_connection *hc) {
return EVBUFFER_LENGTH(hc->bev->output);
}
/*
* Function to return an http chunk with previous unknown size. HTTP/1.1 allows
* for chunked transfers which HTTP/1.0 doesnt know about. There is no legal way
* to do this so we hope our best.
*
*/
int http_return_stream(struct http_connection *hc, void *data, size_t datalen) {
/* We are chunked and done sending - end session */
if (!data) {
/* Chunked transfer - send a 0 chunk */
if (hc->proto == HP_HTTP11) {
evbuffer_add_printf(hc->evb,"0\r\n\r\n");
bufferevent_write_buffer(hc->bev, hc->evb);
}
hc->status=HC_STATUS_END;
return 1;
}
/* In case of Transfer-Encoding: chunked send a chunk - otherwise just data */
if (hc->proto == HP_HTTP11) {
evbuffer_add_printf(hc->evb,"%zx\r\n", datalen);
evbuffer_add(hc->evb, data, datalen);
evbuffer_add_printf(hc->evb, "\r\n");
} else {
evbuffer_add(hc->evb, data, datalen);
}
bufferevent_write_buffer(hc->bev, hc->evb);
Dprintf("%s: output buffer len %d\n", __FUNCTION__,
EVBUFFER_LENGTH(hc->bev->output));
return 1;
}
int http_header_add(struct http_connection *hc, char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
hc->hsize+=vsprintf(&hc->hdr[hc->hsize], fmt, ap);
hc->hdr[hc->hsize++]=0x0d;
hc->hdr[hc->hsize++]=0x0a;
hc->hdr[hc->hsize]=0x00;
va_end(ap);
return 0;
}
int http_header_end(struct http_connection *hc) {
if (hc->keepalive)
http_header_add(hc, "Connection: keep-alive");
else
http_header_add(hc, "Connection: close");
hc->hsize+=sprintf(&hc->hdr[hc->hsize], "\r\n");
bufferevent_write(hc->bev, hc->hdr, hc->hsize);
hc->hsize=0;
return 0;
}
int http_header_clength(struct http_connection *hc, ssize_t length) {
if (length >= 0)
http_header_add(hc, "Content-Length: %d", length);
else {
if (hc->proto == HP_HTTP11)
http_header_add(hc, "Transfer-Encoding: chunked");
}
return 0;
}
int http_header_nocache(struct http_connection *hc) {
http_header_add(hc, "Pragma: no-cache");
http_header_add(hc, "Cache-Control: no-cache");
return 0;
}
int http_header_start(struct http_connection *hc, char *result, char *type) {
struct tm *tm;
time_t t;
/* Wed, 17 May 2006 17:33:00 GMT */
t=time(NULL);
tm=gmtime(&t);
hc->hsize=0;
hc->hsize+=sprintf(&hc->hdr[hc->hsize],
"HTTP/1.1 %s\r\n", result);
hc->hsize+=sprintf(&hc->hdr[hc->hsize],
"Date: ");
hc->hsize+=strftime(&hc->hdr[hc->hsize],
MAX_HEADER_SIZE-hc->hsize,
"%a, %d %b %Y %H:%M:%S %Z\r\n", tm);
http_header_add(hc, "Content-Type: %s", type);
return 0;
}
/*
* Send a simple request answer:
* Content-Length: is set - No chunked, partial transfer,
* After requests gets answered - connection will be closed
*
*/
int http_return_simple(struct http_connection *hc, char *result,
char *type, void *data, size_t datalen) {
http_header_start(hc, result, type);
http_header_clength(hc, datalen);
http_header_end(hc);
bufferevent_write(hc->bev, data, datalen);
hc->status=HC_STATUS_END;
return 1;
}
static int http_process_query(struct http_connection *hc) {
struct http_url *hu;
/*
* FIXME Need to parse url to parameters, unescaping
* characters etc ...
*
*/
hu=g_hash_table_lookup(hc->server->urls, hc->url);
Dprintf("%s: hu %p\n", __FUNCTION__, hu);
if (hu) {
hc->url_handler=hu->cb;
return hc->url_handler(hc, HCB_QUERY, hu->arg);
}
return hc->url_handler(hc, HCB_QUERY, NULL);
}
static int http_read_head(struct http_connection *hc, struct bufferevent *bev) {
struct evbuffer *input = EVBUFFER_INPUT(bev);
u_char *eol, *p;
int err, drainlen;
while((eol=evbuffer_find(input, (u_char *) "\n", 1)) != NULL) {
/* get begin of line */
p=EVBUFFER_DATA(input);
/* Line length */
drainlen=eol-p+1;
/*
* Remove \n and if exists the \r
* FIXME Is this robust enough ?
*/
*eol=0x0;
if (eol > p && *(eol-1) == '\r')
*(--eol) = 0x0;
if (!hc->url) {
/* Did we have the first line with command and url ? */
err=http_parse_command_url(hc, input);
} else if (eol == p) {
err=http_process_query(hc);
} else {
err=http_parse_attrib(hc, input);
}
/* tell buffer to remove leading bytes */
evbuffer_drain(input, drainlen);
if (!err)
return 0;
}
return 1;
}
/*
* Free Request based resources from the http_connection
*
*/
static void http_request_free(struct http_connection *hc) {
GList *item;
struct http_attrib *ha;
if (hc->url)
free(hc->url);
hc->url=NULL;
/* Free http attributes */
while((item=g_list_first(hc->attrib))) {
hc->attrib=g_list_remove_link(hc->attrib, item);
ha=item->data;
free(ha->token);
free(ha->value);
free(ha);
g_list_free(item);
}
}
/*
* Drop the connection in case of error of non keepalive
*/
void http_drop_connection(struct http_connection *hc) {
struct http_server *hs=hc->server;
Dprintf("%s:%d\n", __FUNCTION__, __LINE__);
hs->conn=g_list_remove(hs->conn, hc);
bufferevent_disable(hc->bev, EV_READ|EV_WRITE);
bufferevent_free(hc->bev);
http_request_free(hc);
close(hc->fd);
evbuffer_free(hc->evb);
free(hc);
}
/*
* Application signals http request end - either
* drop the connection or simply free the request
* resources.
*
*/
void http_request_end(struct http_connection *hc) {
if (!hc->keepalive) {
http_drop_connection(hc);
} else {
http_request_free(hc);
hc->status=HC_STATUS_HEAD;
hc->url_handler=&http_url_handler_404;
hc->hsize=0;
}
}
/*
* Callback handler for EV_READ of the client connection. If data
* arrives for our handler
*/
static void http_cb_read(struct bufferevent *bev, void *arg) {
struct http_connection *hc=arg;
Dprintf("%s:%d\n", __FUNCTION__, __LINE__);
switch(hc->status) {
case(HC_STATUS_END):
hc->url_handler(hc, HCB_END, hc->arg);
break;
case(HC_STATUS_HEAD):
if (!http_read_head(hc, bev))
hc->url_handler(hc, HCB_ERROR, hc->arg);
break;
case(HC_STATUS_BODY):
hc->url_handler(hc, HCB_READ, hc->arg);
break;
}
}
static void http_cb_write(struct bufferevent *bev, void *arg) {
struct http_connection *hc=arg;
Dprintf("%s:%d\n", __FUNCTION__, __LINE__);
if (hc->status != HC_STATUS_END)
hc->url_handler(hc, HCB_WRITE, hc->arg);
if (hc->status == HC_STATUS_END)
hc->url_handler(hc, HCB_END, hc->arg);
}
static void http_cb_error(struct bufferevent *bev, short what, void *arg) {
struct http_connection *hc=arg;
Dprintf("%s:%d\n", __FUNCTION__, __LINE__);
hc->url_handler(hc, HCB_ERROR, hc->arg);
}
static void http_connect(int fd, short ev, void *arg) {
struct http_server *hs=arg;
struct http_connection *hc;
struct sockaddr_in sin;
socklen_t slen=sizeof(struct sockaddr_in);
int nfd;
unsigned long flags;
nfd=accept(fd, (struct sockaddr *) &sin, &slen);
if (nfd < 0)
return;
Dprintf("%s:%d New connection\n", __FUNCTION__, __LINE__);
/* Set new socket O_NONBLOCK */
flags=fcntl(nfd, F_GETFL);
fcntl(nfd, F_SETFL, flags | O_NONBLOCK);
hc=calloc(1, sizeof(struct http_connection));
hc->fd=nfd;
hc->server=hs;
hc->status=HC_STATUS_HEAD;
hc->cid=hs->cid++;
hc->evb=evbuffer_new();
/* Copy remote endpoint sockaddr to http_connection structure */
memcpy(&hc->sin, &sin, sizeof(struct sockaddr_in));
hc->bev=bufferevent_new(hc->fd, http_cb_read, http_cb_write, http_cb_error, hc);
bufferevent_enable(hc->bev, EV_READ);
hc->url_handler=&http_url_handler_404;
hs->conn=g_list_append(hs->conn, hc);
}
int http_register_url(struct http_server *hs, struct http_url *hu) {
while(hu->url) {
g_hash_table_insert(hs->urls, hu->url, hu);
hu++;
}
return 1;
}
struct http_server *http_init(int port) {
struct http_server *hs;
unsigned long flags;
int one=1;
hs=calloc(1, sizeof(struct http_server));
hs->port=port;
hs->urls=g_hash_table_new(g_str_hash, g_str_equal);
hs->fd=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
setsockopt(hs->fd, SOL_SOCKET, SO_REUSEADDR,
(void *) &one, sizeof(int));
hs->sin.sin_family=AF_INET;
hs->sin.sin_port=htons(port);
hs->sin.sin_addr.s_addr=INADDR_ANY;
if (bind(hs->fd, (struct sockaddr *) &hs->sin,
sizeof(struct sockaddr_in)))
return NULL;
if (listen(hs->fd, 3))
return NULL;
flags=fcntl(hs->fd, F_GETFL);
fcntl(hs->fd, F_GETFL, flags | O_NONBLOCK);
event_set(&hs->ev, hs->fd, EV_READ|EV_PERSIST, http_connect, (void *) hs);
event_add(&hs->ev, NULL);
return hs;
}