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/* $OpenBSD: check_http.c,v 1.3 2006/12/25 18:12:14 reyk Exp $ */
/*
* Copyright (c) 2006 Pierre-Yves Ritschard <pyr@spootnik.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <net/if.h>
#include <sha1.h>
#include <limits.h>
#include <event.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "hostated.h"
void check_http_code(struct ctl_tcp_event *);
void check_http_digest(struct ctl_tcp_event *);
void http_read(int, short, void *);
void
check_http_code(struct ctl_tcp_event *cte)
{
char *head;
char scode[4];
const char *estr;
int code;
head = cte->buf->buf;
if (strncmp(head, "HTTP/1.1 ", strlen("HTTP/1.1 ")) &&
strncmp(head, "HTTP/1.0 ", strlen("HTTP/1.0 "))) {
log_debug("check_http_code: cannot parse HTTP version");
cte->host->up = HOST_DOWN;
return;
}
head += strlen("HTTP/1.1 ");
if (strlen(head) < 5) /* code + \r\n */ {
cte->host->up = HOST_DOWN;
return;
}
strlcpy(scode, head, sizeof(scode));
code = strtonum(scode, 100, 999, &estr);
if (estr != NULL) {
log_debug("check_http_code: cannot parse HTTP code");
cte->host->up = HOST_DOWN;
return;
}
if (code != cte->table->retcode) {
log_debug("check_http_code: invalid HTTP code returned");
cte->host->up = HOST_DOWN;
} else
cte->host->up = HOST_UP;
}
void
check_http_digest(struct ctl_tcp_event *cte)
{
char *head;
char digest[(SHA1_DIGEST_LENGTH*2)+1];
head = cte->buf->buf;
if ((head = strstr(head, "\r\n\r\n")) == NULL) {
log_debug("check_http_digest: host %u no end of headers",
cte->host->id);
cte->host->up = HOST_DOWN;
return;
}
head += strlen("\r\n\r\n");
SHA1Data(head, strlen(head), digest);
if (strcmp(cte->table->digest, digest)) {
log_warnx("check_http_digest: wrong digest for host %u",
cte->host->id);
cte->host->up = HOST_DOWN;
} else
cte->host->up = HOST_UP;
}
void
http_read(int s, short event, void *arg)
{
ssize_t br;
char rbuf[SMALL_READ_BUF_SIZE];
struct timeval tv;
struct timeval tv_now;
struct ctl_tcp_event *cte = arg;
if (event == EV_TIMEOUT) {
cte->host->up = HOST_DOWN;
buf_free(cte->buf);
hce_notify_done(cte->host, "http_read: timeout");
return;
}
br = read(s, rbuf, sizeof(rbuf));
if (br == 0) {
cte->host->up = HOST_DOWN;
switch (cte->table->check) {
case CHECK_HTTP_CODE:
check_http_code(cte);
break;
case CHECK_HTTP_DIGEST:
check_http_digest(cte);
break;
default:
fatalx("http_read: unhandled check type");
}
buf_free(cte->buf);
hce_notify_done(cte->host, "http_read: connection closed");
} else if (br == -1) {
cte->host->up = HOST_DOWN;
buf_free(cte->buf);
hce_notify_done(cte->host, "http_read: read failed");
} else {
buf_add(cte->buf, rbuf, br);
tv.tv_sec = cte->table->timeout / 1000;
tv.tv_usec = cte->table->timeout % 1000;
if (gettimeofday(&tv_now, NULL))
fatal("send_http_request: gettimeofday");
timersub(&tv_now, &cte->tv_start, &tv_now);
timersub(&tv, &tv_now, &tv);
event_once(s, EV_READ|EV_TIMEOUT, http_read, cte, &tv);
}
}
void
send_http_request(struct ctl_tcp_event *cte)
{
int bs;
int pos;
int len;
char *req;
struct timeval tv;
struct timeval tv_now;
switch (cte->table->check) {
case CHECK_HTTP_CODE:
asprintf(&req, "HEAD %s HTTP/1.0\r\n\r\n",
cte->table->path);
break;
case CHECK_HTTP_DIGEST:
asprintf(&req, "GET %s HTTP/1.0\r\n\r\n",
cte->table->path);
break;
default:
fatalx("send_http_request: unhandled check type");
}
if (req == NULL)
fatal("out of memory");
pos = 0;
len = strlen(req);
/*
* write all at once for now.
*/
do {
bs = write(cte->s, req + pos, len);
if (bs <= 0) {
log_warnx("send_http_request: cannot send request");
cte->host->up = HOST_DOWN;
hce_notify_done(cte->host, "send_http_request: write");
free(req);
return;
}
pos += bs;
len -= bs;
} while (len > 0);
free(req);
if ((cte->buf = buf_dynamic(SMALL_READ_BUF_SIZE, UINT_MAX)) == NULL)
fatalx("send_http_request: cannot create dynamic buffer");
tv.tv_sec = cte->table->timeout / 1000;
tv.tv_usec = cte->table->timeout % 1000;
if (gettimeofday(&tv_now, NULL))
fatal("send_http_request: gettimeofday");
timersub(&tv_now, &cte->tv_start, &tv_now);
timersub(&tv, &tv_now, &tv);
event_once(cte->s, EV_READ|EV_TIMEOUT, http_read, cte, &tv);
}
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