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haproxy/contrib/mod_defender/spoa.c

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/*
* Mod Defender for HAProxy
*
* Copyright 2017 HAProxy Technologies, Dragan Dosen <ddosen@haproxy.com>
*
* Based on "A Random IP reputation service acting as a Stream Processing Offload Agent"
* Copyright 2016 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.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.
*
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <err.h>
#include <ctype.h>
#include <pthread.h>
#include <event2/util.h>
#include <event2/event.h>
#include <event2/event_struct.h>
#include <event2/thread.h>
#include <common/mini-clist.h>
#include <common/chunk.h>
#include <proto/spoe.h>
#include "spoa.h"
#include "defender.h"
#define DEFAULT_PORT 12345
#define CONNECTION_BACKLOG 10
#define NUM_WORKERS 10
#define MAX_FRAME_SIZE 16384
#define SPOP_VERSION "2.0"
#define SLEN(str) (sizeof(str)-1)
#define DEBUG(x...) \
do { \
if (debug) \
LOG(x); \
} while (0)
enum spoa_state {
SPOA_ST_CONNECTING = 0,
SPOA_ST_PROCESSING,
SPOA_ST_DISCONNECTING,
};
enum spoa_frame_type {
SPOA_FRM_T_UNKNOWN = 0,
SPOA_FRM_T_HAPROXY,
SPOA_FRM_T_AGENT,
};
struct spoe_engine {
char *id;
struct list processing_frames;
struct list outgoing_frames;
struct list clients;
struct list list;
};
struct spoe_frame {
enum spoa_frame_type type;
char *buf;
unsigned int offset;
unsigned int len;
unsigned int stream_id;
unsigned int frame_id;
unsigned int flags;
bool hcheck; /* true is the CONNECT frame is a healthcheck */
bool fragmented; /* true if the frame is fragmented */
int defender_status; /* mod_defender returned status */
struct event process_frame_event;
struct worker *worker;
struct spoe_engine *engine;
struct client *client;
struct list list;
char *frag_buf; /* used to accumulate payload of a fragmented frame */
unsigned int frag_len;
char data[0];
};
struct client {
int fd;
unsigned long id;
enum spoa_state state;
struct event read_frame_event;
struct event write_frame_event;
struct spoe_frame *incoming_frame;
struct spoe_frame *outgoing_frame;
struct list processing_frames;
struct list outgoing_frames;
unsigned int max_frame_size;
int status_code;
char *engine_id;
struct spoe_engine *engine;
bool pipelining;
bool async;
bool fragmentation;
struct worker *worker;
struct list by_worker;
struct list by_engine;
};
/* Globals */
static struct worker *workers = NULL;
struct worker null_worker = { .id = 0 };
static unsigned long clicount = 0;
static int server_port = DEFAULT_PORT;
static int num_workers = NUM_WORKERS;
static unsigned int max_frame_size = MAX_FRAME_SIZE;
struct timeval processing_delay = {0, 0};
static bool debug = false;
static bool pipelining = false;
static bool async = false;
static bool fragmentation = false;
static const char *spoe_frm_err_reasons[SPOE_FRM_ERRS] = {
[SPOE_FRM_ERR_NONE] = "normal",
[SPOE_FRM_ERR_IO] = "I/O error",
[SPOE_FRM_ERR_TOUT] = "a timeout occurred",
[SPOE_FRM_ERR_TOO_BIG] = "frame is too big",
[SPOE_FRM_ERR_INVALID] = "invalid frame received",
[SPOE_FRM_ERR_NO_VSN] = "version value not found",
[SPOE_FRM_ERR_NO_FRAME_SIZE] = "max-frame-size value not found",
[SPOE_FRM_ERR_NO_CAP] = "capabilities value not found",
[SPOE_FRM_ERR_BAD_VSN] = "unsupported version",
[SPOE_FRM_ERR_BAD_FRAME_SIZE] = "max-frame-size too big or too small",
[SPOE_FRM_ERR_FRAG_NOT_SUPPORTED] = "fragmentation not supported",
[SPOE_FRM_ERR_INTERLACED_FRAMES] = "invalid interlaced frames",
[SPOE_FRM_ERR_FRAMEID_NOTFOUND] = "frame-id not found",
[SPOE_FRM_ERR_RES] = "resource allocation error",
[SPOE_FRM_ERR_UNKNOWN] = "an unknown error occurred",
};
static void signal_cb(evutil_socket_t, short, void *);
static void accept_cb(evutil_socket_t, short, void *);
static void worker_monitor_cb(evutil_socket_t, short, void *);
static void process_frame_cb(evutil_socket_t, short, void *);
static void read_frame_cb(evutil_socket_t, short, void *);
static void write_frame_cb(evutil_socket_t, short, void *);
static void use_spoe_engine(struct client *);
static void unuse_spoe_engine(struct client *);
static void release_frame(struct spoe_frame *);
static void release_client(struct client *);
/* Check the protocol version. It returns -1 if an error occurred, the number of
* read bytes otherwise. */
static int
check_proto_version(struct spoe_frame *frame, char **buf, char *end)
{
char *str, *p = *buf;
uint64_t sz;
int ret;
/* Get the list of all supported versions by HAProxy */
if ((*p++ & SPOE_DATA_T_MASK) != SPOE_DATA_T_STR)
return -1;
ret = spoe_decode_buffer(&p, end, &str, &sz);
if (ret == -1 || !str)
return -1;
DEBUG(frame->worker, "<%lu> Supported versions : %.*s",
frame->client->id, (int)sz, str);
/* TODO: Find the right verion in supported ones */
ret = (p - *buf);
*buf = p;
return ret;
}
/* Check max frame size value. It returns -1 if an error occurred, the number of
* read bytes otherwise. */
static int
check_max_frame_size(struct spoe_frame *frame, char **buf, char *end)
{
char *p = *buf;
uint64_t sz;
int type, ret;
/* Get the max-frame-size value of HAProxy */
type = *p++;
if ((type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT32 &&
(type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT64 &&
(type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT32 &&
(type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT64)
return -1;
if (decode_varint(&p, end, &sz) == -1)
return -1;
/* Keep the lower value */
if (sz < frame->client->max_frame_size)
frame->client->max_frame_size = sz;
DEBUG(frame->worker, "<%lu> HAProxy maximum frame size : %u",
frame->client->id, (unsigned int)sz);
ret = (p - *buf);
*buf = p;
return ret;
}
/* Check healthcheck value. It returns -1 if an error occurred, the number of
* read bytes otherwise. */
static int
check_healthcheck(struct spoe_frame *frame, char **buf, char *end)
{
char *p = *buf;
int type, ret;
/* Get the "healthcheck" value */
type = *p++;
if ((type & SPOE_DATA_T_MASK) != SPOE_DATA_T_BOOL)
return -1;
frame->hcheck = ((type & SPOE_DATA_FL_TRUE) == SPOE_DATA_FL_TRUE);
DEBUG(frame->worker, "<%lu> HELLO healthcheck : %s",
frame->client->id, (frame->hcheck ? "true" : "false"));
ret = (p - *buf);
*buf = p;
return ret;
}
/* Check capabilities value. It returns -1 if an error occurred, the number of
* read bytes otherwise. */
static int
check_capabilities(struct spoe_frame *frame, char **buf, char *end)
{
struct client *client = frame->client;
char *str, *p = *buf;
uint64_t sz;
int ret;
if ((*p++ & SPOE_DATA_T_MASK) != SPOE_DATA_T_STR)
return -1;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
return -1;
if (str == NULL) /* this is not an error */
goto end;
DEBUG(frame->worker, "<%lu> HAProxy capabilities : %.*s",
client->id, (int)sz, str);
while (sz) {
char *delim;
/* Skip leading spaces */
for (; isspace(*str) && sz; sz--);
if (sz >= 10 && !strncmp(str, "pipelining", 10)) {
str += 10; sz -= 10;
if (!sz || isspace(*str) || *str == ',') {
DEBUG(frame->worker,
"<%lu> HAProxy supports frame pipelining",
client->id);
client->pipelining = true;
}
}
else if (sz >= 5 && !strncmp(str, "async", 5)) {
str += 5; sz -= 5;
if (!sz || isspace(*str) || *str == ',') {
DEBUG(frame->worker,
"<%lu> HAProxy supports asynchronous frame",
client->id);
client->async = true;
}
}
else if (sz >= 13 && !strncmp(str, "fragmentation", 13)) {
str += 13; sz -= 13;
if (!sz || isspace(*str) || *str == ',') {
DEBUG(frame->worker,
"<%lu> HAProxy supports fragmented frame",
client->id);
client->fragmentation = true;
}
}
if (!sz || (delim = memchr(str, ',', sz)) == NULL)
break;
delim++;
sz -= (delim - str);
str = delim;
}
end:
ret = (p - *buf);
*buf = p;
return ret;
}
/* Check engine-id value. It returns -1 if an error occurred, the number of
* read bytes otherwise. */
static int
check_engine_id(struct spoe_frame *frame, char **buf, char *end)
{
struct client *client = frame->client;
char *str, *p = *buf;
uint64_t sz;
int ret;
if ((*p++ & SPOE_DATA_T_MASK) != SPOE_DATA_T_STR)
return -1;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
return -1;
if (str == NULL) /* this is not an error */
goto end;
if (client->engine != NULL)
goto end;
DEBUG(frame->worker, "<%lu> HAProxy engine id : %.*s",
client->id, (int)sz, str);
client->engine_id = strndup(str, (int)sz);
end:
ret = (p - *buf);
*buf = p;
return ret;
}
static int
acc_payload(struct spoe_frame *frame)
{
struct client *client = frame->client;
char *buf;
size_t len = frame->len - frame->offset;
int ret = frame->offset;
/* No need to accumulation payload */
if (frame->fragmented == false)
return ret;
buf = realloc(frame->frag_buf, frame->frag_len + len);
if (buf == NULL) {
client->status_code = SPOE_FRM_ERR_RES;
return -1;
}
memcpy(buf + frame->frag_len, frame->buf + frame->offset, len);
frame->frag_buf = buf;
frame->frag_len += len;
if (!(frame->flags & SPOE_FRM_FL_FIN)) {
/* Wait for next parts */
frame->buf = (char *)(frame->data);
frame->offset = 0;
frame->len = 0;
frame->flags = 0;
return 1;
}
frame->buf = frame->frag_buf;
frame->len = frame->frag_len;
frame->offset = 0;
return ret;
}
/* Check disconnect status code. It returns -1 if an error occurred, the number
* of read bytes otherwise. */
static int
check_discon_status_code(struct spoe_frame *frame, char **buf, char *end)
{
char *p = *buf;
uint64_t sz;
int type, ret;
/* Get the "status-code" value */
type = *p++;
if ((type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT32 &&
(type & SPOE_DATA_T_MASK) != SPOE_DATA_T_INT64 &&
(type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT32 &&
(type & SPOE_DATA_T_MASK) != SPOE_DATA_T_UINT64)
return -1;
if (decode_varint(&p, end, &sz) == -1)
return -1;
frame->client->status_code = (unsigned int)sz;
DEBUG(frame->worker, "<%lu> Disconnect status code : %u",
frame->client->id, frame->client->status_code);
ret = (p - *buf);
*buf = p;
return ret;
}
/* Check the disconnect message. It returns -1 if an error occurred, the number
* of read bytes otherwise. */
static int
check_discon_message(struct spoe_frame *frame, char **buf, char *end)
{
char *str, *p = *buf;
uint64_t sz;
int ret;
/* Get the "message" value */
if ((*p++ & SPOE_DATA_T_MASK) != SPOE_DATA_T_STR)
return -1;
ret = spoe_decode_buffer(&p, end, &str, &sz);
if (ret == -1 || !str)
return -1;
DEBUG(frame->worker, "<%lu> Disconnect message : %.*s",
frame->client->id, (int)sz, str);
ret = (p - *buf);
*buf = p;
return ret;
}
/* Decode a HELLO frame received from HAProxy. It returns -1 if an error
* occurred, otherwise the number of read bytes. HELLO frame cannot be
* ignored and having another frame than a HELLO frame is an error. */
static int
handle_hahello(struct spoe_frame *frame)
{
struct client *client = frame->client;
char *p, *end;
p = frame->buf;
end = frame->buf + frame->len;
/* Check frame type: we really want a HELLO frame */
if (*p++ != SPOE_FRM_T_HAPROXY_HELLO)
goto error;
DEBUG(frame->worker, "<%lu> Decode HAProxy HELLO frame", client->id);
/* Retrieve flags */
memcpy((char *)&(frame->flags), p, 4);
frame->flags = ntohl(frame->flags);
p += 4;
/* Fragmentation is not supported for HELLO frame */
if (!(frame->flags & SPOE_FRM_FL_FIN)) {
client->status_code = SPOE_FRM_ERR_FRAG_NOT_SUPPORTED;
goto error;
}
/* stream-id and frame-id must be cleared */
if (*p != 0 || *(p+1) != 0) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
p += 2;
/* Loop on K/V items */
while (p < end) {
char *str;
uint64_t sz;
/* Decode the item name */
spoe_decode_buffer(&p, end, &str, &sz);
if (!str) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
/* Check "supported-versions" K/V item */
if (!memcmp(str, "supported-versions", sz)) {
if (check_proto_version(frame, &p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
/* Check "max-frame-size" K/V item */
else if (!memcmp(str, "max-frame-size", sz)) {
if (check_max_frame_size(frame, &p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
/* Check "healthcheck" K/V item */
else if (!memcmp(str, "healthcheck", sz)) {
if (check_healthcheck(frame, &p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
/* Check "capabilities" K/V item */
else if (!memcmp(str, "capabilities", sz)) {
if (check_capabilities(frame, &p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
/* Check "engine-id" K/V item */
else if (!memcmp(str, "engine-id", sz)) {
if (check_engine_id(frame, &p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
else {
DEBUG(frame->worker, "<%lu> Skip K/V item : key=%.*s",
client->id, (int)sz, str);
/* Silently ignore unknown item */
if (spoe_skip_data(&p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
}
if (async == false || client->engine_id == NULL)
client->async = false;
if (pipelining == false)
client->pipelining = false;
if (client->async == true)
use_spoe_engine(client);
return (p - frame->buf);
error:
return -1;
}
/* Decode a DISCONNECT frame received from HAProxy. It returns -1 if an error
* occurred, otherwise the number of read bytes. DISCONNECT frame cannot be
* ignored and having another frame than a DISCONNECT frame is an error.*/
static int
handle_hadiscon(struct spoe_frame *frame)
{
struct client *client = frame->client;
char *p, *end;
p = frame->buf;
end = frame->buf + frame->len;
/* Check frame type: we really want a DISCONNECT frame */
if (*p++ != SPOE_FRM_T_HAPROXY_DISCON)
goto error;
DEBUG(frame->worker, "<%lu> Decode HAProxy DISCONNECT frame", client->id);
/* Retrieve flags */
memcpy((char *)&(frame->flags), p, 4);
frame->flags = ntohl(frame->flags);
p += 4;
/* Fragmentation is not supported for DISCONNECT frame */
if (!(frame->flags & SPOE_FRM_FL_FIN)) {
client->status_code = SPOE_FRM_ERR_FRAG_NOT_SUPPORTED;
goto error;
}
/* stream-id and frame-id must be cleared */
if (*p != 0 || *(p+1) != 0) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
p += 2;
client->status_code = SPOE_FRM_ERR_NONE;
/* Loop on K/V items */
while (p < end) {
char *str;
uint64_t sz;
/* Decode item key */
spoe_decode_buffer(&p, end, &str, &sz);
if (!str) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
/* Check "status-code" K/V item */
if (!memcmp(str, "status-code", sz)) {
if (check_discon_status_code(frame, &p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
/* Check "message" K/V item */
else if (!memcmp(str, "message", sz)) {
if (check_discon_message(frame, &p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
else {
DEBUG(frame->worker, "<%lu> Skip K/V item : key=%.*s",
client->id, (int)sz, str);
/* Silently ignore unknown item */
if (spoe_skip_data(&p, end) == -1) {
client->status_code = SPOE_FRM_ERR_INVALID;
goto error;
}
}
}
return (p - frame->buf);
error:
return -1;
}
/* Decode a NOTIFY frame received from HAProxy. It returns -1 if an error
* occurred, 0 if it must be must be ignored, otherwise the number of read
* bytes. */
static int
handle_hanotify(struct spoe_frame *frame)
{
struct client *client = frame->client;
char *p, *end;
uint64_t stream_id, frame_id;
p = frame->buf;
end = frame->buf + frame->len;
/* Check frame type */
if (*p++ != SPOE_FRM_T_HAPROXY_NOTIFY)
goto ignore;
DEBUG(frame->worker, "<%lu> Decode HAProxy NOTIFY frame", client->id);
/* Retrieve flags */
memcpy((char *)&(frame->flags), p, 4);
frame->flags = ntohl(frame->flags);
p += 4;
/* Fragmentation is not supported */
if (!(frame->flags & SPOE_FRM_FL_FIN) && fragmentation == false) {
client->status_code = SPOE_FRM_ERR_FRAG_NOT_SUPPORTED;
goto error;
}
/* Read the stream-id and frame-id */
if (decode_varint(&p, end, &stream_id) == -1)
goto ignore;
if (decode_varint(&p, end, &frame_id) == -1)
goto ignore;
frame->stream_id = (unsigned int)stream_id;
frame->frame_id = (unsigned int)frame_id;
DEBUG(frame->worker, "<%lu> STREAM-ID=%u - FRAME-ID=%u"
" - %s frame received"
" - frag_len=%u - len=%u - offset=%ld",
client->id, frame->stream_id, frame->frame_id,
(frame->flags & SPOE_FRM_FL_FIN) ? "unfragmented" : "fragmented",
frame->frag_len, frame->len, p - frame->buf);
frame->fragmented = !(frame->flags & SPOE_FRM_FL_FIN);
frame->offset = (p - frame->buf);
return acc_payload(frame);
ignore:
return 0;
error:
return -1;
}
/* Decode next part of a fragmented frame received from HAProxy. It returns -1
* if an error occurred, 0 if it must be must be ignored, otherwise the number
* of read bytes. */
static int
handle_hafrag(struct spoe_frame *frame)
{
struct client *client = frame->client;
char *p, *end;
uint64_t stream_id, frame_id;
p = frame->buf;
end = frame->buf + frame->len;
/* Check frame type */
if (*p++ != SPOE_FRM_T_UNSET)
goto ignore;
DEBUG(frame->worker, "<%lu> Decode Next part of a fragmented frame", client->id);
/* Fragmentation is not supported */
if (fragmentation == false) {
client->status_code = SPOE_FRM_ERR_FRAG_NOT_SUPPORTED;
goto error;
}
/* Retrieve flags */
memcpy((char *)&(frame->flags), p, 4);
frame->flags = ntohl(frame->flags);
p+= 4;
/* Read the stream-id and frame-id */
if (decode_varint(&p, end, &stream_id) == -1)
goto ignore;
if (decode_varint(&p, end, &frame_id) == -1)
goto ignore;
if (frame->fragmented == false ||
frame->stream_id != (unsigned int)stream_id ||
frame->frame_id != (unsigned int)frame_id) {
client->status_code = SPOE_FRM_ERR_INTERLACED_FRAMES;
goto error;
}
if (frame->flags & SPOE_FRM_FL_ABRT) {
DEBUG(frame->worker, "<%lu> STREAM-ID=%u - FRAME-ID=%u"
" - Abort processing of a fragmented frame"
" - frag_len=%u - len=%u - offset=%ld",
client->id, frame->stream_id, frame->frame_id,
frame->frag_len, frame->len, p - frame->buf);
goto ignore;
}
DEBUG(frame->worker, "<%lu> STREAM-ID=%u - FRAME-ID=%u"
" - %s fragment of a fragmented frame received"
" - frag_len=%u - len=%u - offset=%ld",
client->id, frame->stream_id, frame->frame_id,
(frame->flags & SPOE_FRM_FL_FIN) ? "last" : "next",
frame->frag_len, frame->len, p - frame->buf);
frame->offset = (p - frame->buf);
return acc_payload(frame);
ignore:
return 0;
error:
return -1;
}
/* Encode a HELLO frame to send it to HAProxy. It returns the number of written
* bytes. */
static int
prepare_agenthello(struct spoe_frame *frame)
{
struct client *client = frame->client;
char *p, *end;
char capabilities[64];
int n;
unsigned int flags = SPOE_FRM_FL_FIN;
DEBUG(frame->worker, "<%lu> Encode Agent HELLO frame", client->id);
frame->type = SPOA_FRM_T_AGENT;
p = frame->buf;
end = frame->buf+max_frame_size;
/* Frame Type */
*p++ = SPOE_FRM_T_AGENT_HELLO;
/* Set flags */
flags = htonl(flags);
memcpy(p, (char *)&flags, 4);
p += 4;
/* No stream-id and frame-id for HELLO frames */
*p++ = 0;
*p++ = 0;
/* "version" K/V item */
spoe_encode_buffer("version", 7, &p, end);
*p++ = SPOE_DATA_T_STR;
spoe_encode_buffer(SPOP_VERSION, SLEN(SPOP_VERSION), &p, end);
DEBUG(frame->worker, "<%lu> Agent version : %s",
client->id, SPOP_VERSION);
/* "max-frame-size" K/V item */
spoe_encode_buffer("max-frame-size", 14, &p ,end);
*p++ = SPOE_DATA_T_UINT32;
encode_varint(client->max_frame_size, &p, end);
DEBUG(frame->worker, "<%lu> Agent maximum frame size : %u",
client->id, client->max_frame_size);
/* "capabilities" K/V item */
spoe_encode_buffer("capabilities", 12, &p, end);
*p++ = SPOE_DATA_T_STR;
memset(capabilities, 0, sizeof(capabilities));
n = 0;
/* 1. Fragmentation capability ? */
if (fragmentation == true) {
memcpy(capabilities, "fragmentation", 13);
n += 13;
}
/* 2. Pipelining capability ? */
if (client->pipelining == true) {
if (n) capabilities[n++] = ',';
memcpy(capabilities + n, "pipelining", 10);
n += 10;
}
/* 3. Async capability ? */
if (client->async == true) {
if (n) capabilities[n++] = ',';
memcpy(capabilities + n, "async", 5);
n += 5;
}
spoe_encode_buffer(capabilities, n, &p, end);
DEBUG(frame->worker, "<%lu> Agent capabilities : %.*s",
client->id, n, capabilities);
frame->len = (p - frame->buf);
return frame->len;
}
/* Encode a DISCONNECT frame to send it to HAProxy. It returns the number of
* written bytes. */
static int
prepare_agentdicon(struct spoe_frame *frame)
{
struct client *client = frame->client;
char *p, *end;
const char *reason;
int rlen;
unsigned int flags = SPOE_FRM_FL_FIN;
DEBUG(frame->worker, "<%lu> Encode Agent DISCONNECT frame", client->id);
frame->type = SPOA_FRM_T_AGENT;
p = frame->buf;
end = frame->buf+max_frame_size;
if (client->status_code >= SPOE_FRM_ERRS)
client->status_code = SPOE_FRM_ERR_UNKNOWN;
reason = spoe_frm_err_reasons[client->status_code];
rlen = strlen(reason);
/* Frame type */
*p++ = SPOE_FRM_T_AGENT_DISCON;
/* Set flags */
flags = htonl(flags);
memcpy(p, (char *)&flags, 4);
p += 4;
/* No stream-id and frame-id for DISCONNECT frames */
*p++ = 0;
*p++ = 0;
/* There are 2 mandatory items: "status-code" and "message" */
/* "status-code" K/V item */
spoe_encode_buffer("status-code", 11, &p, end);
*p++ = SPOE_DATA_T_UINT32;
encode_varint(client->status_code, &p, end);
DEBUG(frame->worker, "<%lu> Disconnect status code : %u",
client->id, client->status_code);
/* "message" K/V item */
spoe_encode_buffer("message", 7, &p, end);
*p++ = SPOE_DATA_T_STR;
spoe_encode_buffer(reason, rlen, &p, end);
DEBUG(frame->worker, "<%lu> Disconnect message : %s",
client->id, reason);
frame->len = (p - frame->buf);
return frame->len;
}
/* Encode a ACK frame to send it to HAProxy. It returns the number of written
* bytes. */
static int
prepare_agentack(struct spoe_frame *frame)
{
char *p, *end;
unsigned int flags = SPOE_FRM_FL_FIN;
/* Be careful here, in async mode, frame->client can be NULL */
DEBUG(frame->worker, "Encode Agent ACK frame");
frame->type = SPOA_FRM_T_AGENT;
p = frame->buf;
end = frame->buf+max_frame_size;
/* Frame type */
*p++ = SPOE_FRM_T_AGENT_ACK;
/* Set flags */
flags = htonl(flags);
memcpy(p, (char *)&flags, 4);
p += 4;
/* Set stream-id and frame-id for ACK frames */
encode_varint(frame->stream_id, &p, end);
encode_varint(frame->frame_id, &p, end);
DEBUG(frame->worker, "STREAM-ID=%u - FRAME-ID=%u",
frame->stream_id, frame->frame_id);
frame->len = (p - frame->buf);
return frame->len;
}
static int
create_server_socket(void)
{
struct sockaddr_in listen_addr;
int fd, yes = 1;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
LOG(&null_worker, "Failed to create service socket : %m");
return -1;
}
memset(&listen_addr, 0, sizeof(listen_addr));
listen_addr.sin_family = AF_INET;
listen_addr.sin_addr.s_addr = INADDR_ANY;
listen_addr.sin_port = htons(server_port);
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0 ||
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes)) < 0) {
LOG(&null_worker, "Failed to set option on server socket : %m");
return -1;
}
if (bind(fd, (struct sockaddr *) &listen_addr, sizeof(listen_addr)) < 0) {
LOG(&null_worker, "Failed to bind server socket : %m");
return -1;
}
if (listen(fd, CONNECTION_BACKLOG) < 0) {
LOG(&null_worker, "Failed to listen on server socket : %m");
return -1;
}
return fd;
}
static void
release_frame(struct spoe_frame *frame)
{
struct worker *worker;
if (frame == NULL)
return;
if (event_pending(&frame->process_frame_event, EV_TIMEOUT, NULL))
event_del(&frame->process_frame_event);
worker = frame->worker;
LIST_DEL(&frame->list);
if (frame->frag_buf)
free(frame->frag_buf);
memset(frame, 0, sizeof(*frame)+max_frame_size+4);
LIST_ADDQ(&worker->frames, &frame->list);
}
static void
release_client(struct client *c)
{
struct spoe_frame *frame, *back;
if (c == NULL)
return;
DEBUG(c->worker, "<%lu> Release client", c->id);
LIST_DEL(&c->by_worker);
c->worker->nbclients--;
unuse_spoe_engine(c);
free(c->engine_id);
if (event_pending(&c->read_frame_event, EV_READ, NULL))
event_del(&c->read_frame_event);
if (event_pending(&c->write_frame_event, EV_WRITE, NULL))
event_del(&c->write_frame_event);
release_frame(c->incoming_frame);
release_frame(c->outgoing_frame);
list_for_each_entry_safe(frame, back, &c->processing_frames, list) {
release_frame(frame);
}
list_for_each_entry_safe(frame, back, &c->outgoing_frames, list) {
release_frame(frame);
}
if (c->fd >= 0)
close(c->fd);
free(c);
}
static void
reset_frame(struct spoe_frame *frame)
{
if (frame == NULL)
return;
if (frame->frag_buf)
free(frame->frag_buf);
frame->type = SPOA_FRM_T_UNKNOWN;
frame->buf = (char *)(frame->data);
frame->offset = 0;
frame->len = 0;
frame->stream_id = 0;
frame->frame_id = 0;
frame->flags = 0;
frame->hcheck = false;
frame->fragmented = false;
frame->defender_status = -1;
frame->frag_buf = NULL;
frame->frag_len = 0;
LIST_INIT(&frame->list);
}
static void
use_spoe_engine(struct client *client)
{
struct spoe_engine *eng;
if (client->engine_id == NULL)
return;
list_for_each_entry(eng, &client->worker->engines, list) {
if (!strcmp(eng->id, client->engine_id))
goto end;
}
if ((eng = malloc(sizeof(*eng))) == NULL) {
client->async = false;
return;
}
eng->id = strdup(client->engine_id);
LIST_INIT(&eng->clients);
LIST_INIT(&eng->processing_frames);
LIST_INIT(&eng->outgoing_frames);
LIST_ADDQ(&client->worker->engines, &eng->list);
LOG(client->worker, "Add new SPOE engine '%s'", eng->id);
end:
client->engine = eng;
LIST_ADDQ(&eng->clients, &client->by_engine);
}
static void
unuse_spoe_engine(struct client *client)
{
struct spoe_engine *eng;
struct spoe_frame *frame, *back;
if (client == NULL || client->engine == NULL)
return;
eng = client->engine;
client->engine = NULL;
LIST_DEL(&client->by_engine);
if (!LIST_ISEMPTY(&eng->clients))
return;
LOG(client->worker, "Remove SPOE engine '%s'", eng->id);
LIST_DEL(&eng->list);
list_for_each_entry_safe(frame, back, &eng->processing_frames, list) {
release_frame(frame);
}
list_for_each_entry_safe(frame, back, &eng->outgoing_frames, list) {
release_frame(frame);
}
free(eng->id);
free(eng);
}
static struct spoe_frame *
acquire_incoming_frame(struct client *client)
{
struct spoe_frame *frame;
frame = client->incoming_frame;
if (frame != NULL)
return frame;
if (LIST_ISEMPTY(&client->worker->frames)) {
if ((frame = calloc(1, sizeof(*frame)+max_frame_size+4)) == NULL) {
LOG(client->worker, "Failed to allocate new frame : %m");
return NULL;
}
}
else {
frame = LIST_NEXT(&client->worker->frames, typeof(frame), list);
LIST_DEL(&frame->list);
}
reset_frame(frame);
frame->worker = client->worker;
frame->engine = client->engine;
frame->client = client;
if (event_assign(&frame->process_frame_event, client->worker->base, -1,
EV_TIMEOUT|EV_PERSIST, process_frame_cb, frame) < 0) {
LOG(client->worker, "Failed to create frame event");
return NULL;
}
client->incoming_frame = frame;
return frame;
}
static struct spoe_frame *
acquire_outgoing_frame(struct client *client)
{
struct spoe_engine *engine = client->engine;
struct spoe_frame *frame = NULL;
if (client->outgoing_frame != NULL)
frame = client->outgoing_frame;
else if (!LIST_ISEMPTY(&client->outgoing_frames)) {
frame = LIST_NEXT(&client->outgoing_frames, typeof(frame), list);
LIST_DEL(&frame->list);
client->outgoing_frame = frame;
}
else if (engine!= NULL && !LIST_ISEMPTY(&engine->outgoing_frames)) {
frame = LIST_NEXT(&engine->outgoing_frames, typeof(frame), list);
LIST_DEL(&frame->list);
client->outgoing_frame = frame;
}
return frame;
}
static void
write_frame(struct client *client, struct spoe_frame *frame)
{
uint32_t netint;
LIST_DEL(&frame->list);
frame->buf = (char *)(frame->data);
frame->offset = 0;
netint = htonl(frame->len);
memcpy(frame->buf, &netint, 4);
if (client != NULL) { /* HELLO or DISCONNECT frames */
event_add(&client->write_frame_event, NULL);
/* Try to process the frame as soon as possible, and always
* attach it to the client */
if (client->async || client->pipelining) {
if (client->outgoing_frame == NULL)
client->outgoing_frame = frame;
else
LIST_ADD(&client->outgoing_frames, &frame->list);
}
else {
client->outgoing_frame = frame;
event_del(&client->read_frame_event);
}
}
else { /* for all other frames */
if (frame->client == NULL) { /* async mode ! */
LIST_ADDQ(&frame->engine->outgoing_frames, &frame->list);
list_for_each_entry(client, &frame->engine->clients, by_engine)
event_add(&client->write_frame_event, NULL);
}
else if (frame->client->pipelining) {
LIST_ADDQ(&frame->client->outgoing_frames, &frame->list);
event_add(&frame->client->write_frame_event, NULL);
}
else {
frame->client->outgoing_frame = frame;
event_add(&frame->client->write_frame_event, NULL);
event_del(&frame->client->read_frame_event);
}
}
}
static void
process_incoming_frame(struct spoe_frame *frame)
{
struct client *client = frame->client;
if (event_add(&frame->process_frame_event, &processing_delay) < 0) {
LOG(client->worker, "Failed to process incoming frame");
release_frame(frame);
return;
}
if (client->async) {
frame->client = NULL;
LIST_ADDQ(&frame->engine->processing_frames, &frame->list);
}
else if (client->pipelining)
LIST_ADDQ(&client->processing_frames, &frame->list);
else
event_del(&client->read_frame_event);
}
static void
signal_cb(evutil_socket_t sig, short events, void *user_data)
{
struct event_base *base = user_data;
int i;
DEBUG(&null_worker, "Stopping the server");
event_base_loopbreak(base);
DEBUG(&null_worker, "Main event loop stopped");
for (i = 0; i < num_workers; i++) {
event_base_loopbreak(workers[i].base);
DEBUG(&null_worker, "Event loop stopped for worker %02d",
workers[i].id);
}
}
static void
worker_monitor_cb(evutil_socket_t fd, short events, void *arg)
{
struct worker *worker = arg;
LOG(worker, "%u clients connected", worker->nbclients);
}
static void
process_frame_cb(evutil_socket_t fd, short events, void *arg)
{
struct spoe_frame *frame = arg;
char *p, *end;
int ret;
DEBUG(frame->worker,
"Process frame messages : STREAM-ID=%u - FRAME-ID=%u - length=%u bytes",
frame->stream_id, frame->frame_id, frame->len - frame->offset);
p = frame->buf + frame->offset;
end = frame->buf + frame->len;
/* Loop on messages */
while (p < end) {
char *str;
uint64_t sz;
int nbargs;
/* Decode the message name */
spoe_decode_buffer(&p, end, &str, &sz);
if (!str)
goto stop_processing;
DEBUG(frame->worker, "Process SPOE Message '%.*s'", (int)sz, str);
nbargs = *p++; /* Get the number of arguments */
frame->offset = (p - frame->buf); /* Save index to handle errors and skip args */
if (!memcmp(str, "check-request", sz)) {
struct defender_request request;
memset(&request, 0, sizeof(request));
if (nbargs != 8)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.clientip) == -1)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.id) == -1)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.method) == -1)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.path) == -1)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.query) == -1)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.version) == -1)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.headers) == -1)
goto skip_message;
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_decode_data(&p, end, &request.body) == -1)
goto skip_message;
frame->defender_status = defender_process_request(frame->worker, &request);
}
else {
skip_message:
p = frame->buf + frame->offset; /* Restore index */
while (nbargs-- > 0) {
/* Silently ignore argument: its name and its value */
if (spoe_decode_buffer(&p, end, &str, &sz) == -1)
goto stop_processing;
if (spoe_skip_data(&p, end) == -1)
goto stop_processing;
}
}
}
stop_processing:
/* Prepare agent ACK frame */
frame->buf = (char *)(frame->data) + 4;
frame->offset = 0;
frame->len = 0;
frame->flags = 0;
ret = prepare_agentack(frame);
p = frame->buf + ret;
end = frame->buf+max_frame_size;
if (frame->defender_status != -1) {
DEBUG(frame->worker, "Add action : set variable status=%u",
frame->defender_status);
*p++ = SPOE_ACT_T_SET_VAR; /* Action type */
*p++ = 3; /* Number of args */
*p++ = SPOE_SCOPE_SESS; /* Arg 1: the scope */
spoe_encode_buffer("status", 6, &p, end); /* Arg 2: variable name */
*p++ = SPOE_DATA_T_UINT32;
encode_varint(frame->defender_status, &p, end); /* Arg 3: variable value */
frame->len = (p - frame->buf);
}
write_frame(NULL, frame);
}
static void
read_frame_cb(evutil_socket_t fd, short events, void *arg)
{
struct client *client = arg;
struct spoe_frame *frame;
uint32_t netint;
int n;
DEBUG(client->worker, "<%lu> %s", client->id, __FUNCTION__);
if ((frame = acquire_incoming_frame(client)) == NULL)
goto close;
frame->type = SPOA_FRM_T_HAPROXY;
if (frame->buf == (char *)(frame->data)) {
/* Read the frame length: frame->buf points on length part (frame->data) */
n = read(client->fd, frame->buf+frame->offset, 4-frame->offset);
if (n <= 0) {
if (n < 0)
LOG(client->worker, "Failed to read frame length : %m");
goto close;
}
frame->offset += n;
if (frame->offset != 4)
return;
memcpy(&netint, frame->buf, 4);
frame->buf += 4;
frame->offset = 0;
frame->len = ntohl(netint);
}
/* Read the frame: frame->buf points on frame part (frame->data+4)*/
n = read(client->fd, frame->buf + frame->offset,
frame->len - frame->offset);
if (n <= 0) {
if (n < 0) {
LOG(client->worker, "Frame to read frame : %m");
goto close;
}
return;
}
frame->offset += n;
if (frame->offset != frame->len)
return;
frame->offset = 0;
DEBUG(client->worker, "<%lu> New Frame of %u bytes received",
client->id, frame->len);
switch (client->state) {
case SPOA_ST_CONNECTING:
if (handle_hahello(frame) < 0) {
LOG(client->worker, "Failed to decode HELLO frame");
goto disconnect;
}
prepare_agenthello(frame);
goto write_frame;
case SPOA_ST_PROCESSING:
if (frame->buf[0] == SPOE_FRM_T_HAPROXY_DISCON) {
client->state = SPOA_ST_DISCONNECTING;
goto disconnecting;
}
if (frame->buf[0] == SPOE_FRM_T_UNSET)
n = handle_hafrag(frame);
else
n = handle_hanotify(frame);
if (n < 0) {
LOG(client->worker, "Failed to decode frame: %s",
spoe_frm_err_reasons[client->status_code]);
goto disconnect;
}
else if (n == 0) {
LOG(client->worker, "Ignore invalid/unknown/aborted frame");
goto ignore_frame;
}
else if (n == 1)
goto noop;
else
goto process_frame;
case SPOA_ST_DISCONNECTING:
disconnecting:
if (handle_hadiscon(frame) < 0) {
LOG(client->worker, "Failed to decode DISCONNECT frame");
goto disconnect;
}
if (client->status_code != SPOE_FRM_ERR_NONE)
LOG(client->worker, "<%lu> Peer closed connection: %s",
client->id, spoe_frm_err_reasons[client->status_code]);
goto disconnect;
}
noop:
return;
ignore_frame:
reset_frame(frame);
return;
process_frame:
process_incoming_frame(frame);
client->incoming_frame = NULL;
return;
write_frame:
write_frame(client, frame);
client->incoming_frame = NULL;
return;
disconnect:
client->state = SPOA_ST_DISCONNECTING;
if (prepare_agentdicon(frame) < 0) {
LOG(client->worker, "Failed to encode DISCONNECT frame");
goto close;
}
goto write_frame;
close:
release_client(client);
}
static void
write_frame_cb(evutil_socket_t fd, short events, void *arg)
{
struct client *client = arg;
struct spoe_frame *frame;
int n;
DEBUG(client->worker, "<%lu> %s", client->id, __FUNCTION__);
if ((frame = acquire_outgoing_frame(client)) == NULL) {
event_del(&client->write_frame_event);
return;
}
if (frame->buf == (char *)(frame->data)) {
/* Write the frame length: frame->buf points on length part (frame->data) */
n = write(client->fd, frame->buf+frame->offset, 4-frame->offset);
if (n <= 0) {
if (n < 0)
LOG(client->worker, "Failed to write frame length : %m");
goto close;
}
frame->offset += n;
if (frame->offset != 4)
return;
frame->buf += 4;
frame->offset = 0;
}
/* Write the frame: frame->buf points on frame part (frame->data+4)*/
n = write(client->fd, frame->buf + frame->offset,
frame->len - frame->offset);
if (n <= 0) {
if (n < 0) {
LOG(client->worker, "Failed to write frame : %m");
goto close;
}
return;
}
frame->offset += n;
if (frame->offset != frame->len)
return;
DEBUG(client->worker, "<%lu> Frame of %u bytes send",
client->id, frame->len);
switch (client->state) {
case SPOA_ST_CONNECTING:
if (frame->hcheck == true) {
DEBUG(client->worker,
"<%lu> Close client after healthcheck",
client->id);
goto close;
}
client->state = SPOA_ST_PROCESSING;
break;
case SPOA_ST_PROCESSING:
break;
case SPOA_ST_DISCONNECTING:
goto close;
}
release_frame(frame);
client->outgoing_frame = NULL;
if (!client->async && !client->pipelining) {
event_del(&client->write_frame_event);
event_add(&client->read_frame_event, NULL);
}
return;
close:
release_client(client);
}
static void
accept_cb(int listener, short event, void *arg)
{
struct worker *worker;
struct client *client;
int fd;
worker = &workers[clicount++ % num_workers];
if ((fd = accept(listener, NULL, NULL)) < 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK)
LOG(worker, "Failed to accept client connection : %m");
return;
}
DEBUG(&null_worker,
"<%lu> New Client connection accepted and assigned to worker %02d",
clicount, worker->id);
if (evutil_make_socket_nonblocking(fd) < 0) {
LOG(&null_worker, "Failed to set client socket to non-blocking : %m");
close(fd);
return;
}
if ((client = calloc(1, sizeof(*client))) == NULL) {
LOG(&null_worker, "Failed to allocate memory for client state : %m");
close(fd);
return;
}
client->id = clicount;
client->fd = fd;
client->worker = worker;
client->state = SPOA_ST_CONNECTING;
client->status_code = SPOE_FRM_ERR_NONE;
client->max_frame_size = max_frame_size;
client->engine = NULL;
client->pipelining = false;
client->async = false;
client->incoming_frame = NULL;
client->outgoing_frame = NULL;
LIST_INIT(&client->processing_frames);
LIST_INIT(&client->outgoing_frames);
LIST_ADDQ(&worker->clients, &client->by_worker);
worker->nbclients++;
if (event_assign(&client->read_frame_event, worker->base, fd,
EV_READ|EV_PERSIST, read_frame_cb, client) < 0 ||
event_assign(&client->write_frame_event, worker->base, fd,
EV_WRITE|EV_PERSIST, write_frame_cb, client) < 0) {
LOG(&null_worker, "Failed to create client events");
release_client(client);
return;
}
event_add(&client->read_frame_event, NULL);
}
static void *
worker_function(void *data)
{
struct client *client, *cback;
struct spoe_frame *frame, *fback;
struct worker *worker = data;
DEBUG(worker, "Worker ready to process client messages");
event_base_dispatch(worker->base);
list_for_each_entry_safe(client, cback, &worker->clients, by_worker) {
release_client(client);
}
list_for_each_entry_safe(frame, fback, &worker->frames, list) {
LIST_DEL(&frame->list);
free(frame);
}
event_free(worker->monitor_event);
event_base_free(worker->base);
DEBUG(worker, "Worker is stopped");
pthread_exit(&null_worker);
}
static int
parse_processing_delay(const char *str)
{
unsigned long value;
value = 0;
while (1) {
unsigned int j;
j = *str - '0';
if (j > 9)
break;
str++;
value *= 10;
value += j;
}
switch (*str) {
case '\0': /* no unit = millisecond */
value *= 1000;
break;
case 's': /* second */
value *= 1000000;
str++;
break;
case 'm': /* millisecond : "ms" */
if (str[1] != 's')
return -1;
value *= 1000;
str += 2;
break;
case 'u': /* microsecond : "us" */
if (str[1] != 's')
return -1;
str += 2;
break;
default:
return -1;
}
if (*str)
return -1;
processing_delay.tv_sec = (time_t)(value / 1000000);
processing_delay.tv_usec = (suseconds_t)(value % 1000000);
return 0;
}
static void
usage(char *prog)
{
fprintf(stderr,
"Usage : %s [OPTION]...\n"
" -h Print this message\n"
" -f <config-file> Mod Defender configuration file\n"
" -l <log-file> Mod Defender log file\n"
" -d Enable the debug mode\n"
" -m <max-frame-size> Specify the maximum frame size (default : %u)\n"
" -p <port> Specify the port to listen on (default : %d)\n"
" -n <num-workers> Specify the number of workers (default : %d)\n"
" -c <capability> Enable the support of the specified capability\n"
" -t <time> Set a delay to process a message (default: 0)\n"
" The value is specified in milliseconds by default,\n"
" but can be in any other unit if the number is suffixed\n"
" by a unit (us, ms, s)\n"
"\n"
" Supported capabilities: fragmentation, pipelining, async\n",
prog, MAX_FRAME_SIZE, DEFAULT_PORT, NUM_WORKERS);
}
int
main(int argc, char **argv)
{
struct event_base *base = NULL;
struct event *signal_event = NULL, *accept_event = NULL;
int opt, i, fd = -1;
const char *config_file = NULL;
const char *log_file = NULL;
// TODO: add '-t <processing-time>' option
while ((opt = getopt(argc, argv, "hf:l:dm:n:p:c:t:")) != -1) {
switch (opt) {
case 'h':
usage(argv[0]);
return EXIT_SUCCESS;
case 'f':
config_file = optarg;
break;
case 'l':
log_file = optarg;
break;
case 'd':
debug = true;
break;
case 'm':
max_frame_size = atoi(optarg);
break;
case 'n':
num_workers = atoi(optarg);
break;
case 'p':
server_port = atoi(optarg);
break;
case 'c':
if (!strcmp(optarg, "pipelining"))
pipelining = true;
else if (!strcmp(optarg, "async"))
async = true;
else if (!strcmp(optarg, "fragmentation"))
fragmentation = true;
else
fprintf(stderr, "WARNING: unsupported capability '%s'\n", optarg);
break;
case 't':
if (!parse_processing_delay(optarg))
break;
fprintf(stderr, "%s: failed to parse time '%s'.\n", argv[0], optarg);
fprintf(stderr, "Try '%s -h' for more information.\n", argv[0]);
return EXIT_FAILURE;
default:
usage(argv[0]);
return EXIT_FAILURE;
}
}
if (!defender_init(config_file, log_file))
goto error;
if (num_workers <= 0) {
LOG(&null_worker, "%s : Invalid number of workers '%d'\n",
argv[0], num_workers);
goto error;
}
if (server_port <= 0) {
LOG(&null_worker, "%s : Invalid port '%d'\n",
argv[0], server_port);
goto error;
}
if (evthread_use_pthreads() < 0) {
LOG(&null_worker, "No pthreads support for libevent");
goto error;
}
if ((base = event_base_new()) == NULL) {
LOG(&null_worker, "Failed to initialize libevent : %m");
goto error;
}
signal(SIGPIPE, SIG_IGN);
if ((fd = create_server_socket()) < 0) {
LOG(&null_worker, "Failed to create server socket");
goto error;
}
if (evutil_make_socket_nonblocking(fd) < 0) {
LOG(&null_worker, "Failed to set server socket to non-blocking");
goto error;
}
if ((workers = calloc(num_workers, sizeof(*workers))) == NULL) {
LOG(&null_worker, "Failed to set allocate memory for workers");
goto error;
}
for (i = 0; i < num_workers; ++i) {
struct worker *w = &workers[i];
w->id = i+1;
w->nbclients = 0;
LIST_INIT(&w->engines);
LIST_INIT(&w->clients);
LIST_INIT(&w->frames);
if ((w->base = event_base_new()) == NULL) {
LOG(&null_worker,
"Failed to initialize libevent for worker %02d : %m",
w->id);
goto error;
}
w->monitor_event = event_new(w->base, fd, EV_PERSIST,
worker_monitor_cb, (void *)w);
if (w->monitor_event == NULL ||
event_add(w->monitor_event, (struct timeval[]){{5,0}}) < 0) {
LOG(&null_worker,
"Failed to create monitor event for worker %02d",
w->id);
goto error;
}
if (pthread_create(&w->thread, NULL, worker_function, (void *)w)) {
LOG(&null_worker,
"Failed to start thread for worker %02d : %m",
w->id);
}
DEBUG(&null_worker, "Worker %02d initialized", w->id);
}
accept_event = event_new(base, fd, EV_READ|EV_PERSIST, accept_cb,
(void *)base);
if (accept_event == NULL || event_add(accept_event, NULL) < 0) {
LOG(&null_worker, "Failed to create accept event : %m");
}
signal_event = evsignal_new(base, SIGINT, signal_cb, (void *)base);
if (signal_event == NULL || event_add(signal_event, NULL) < 0) {
LOG(&null_worker, "Failed to create signal event : %m");
}
DEBUG(&null_worker,
"Server is ready"
" [fragmentation=%s - pipelining=%s - async=%s - debug=%s - max-frame-size=%u]",
(fragmentation?"true":"false"), (pipelining?"true":"false"), (async?"true":"false"),
(debug?"true":"false"), max_frame_size);
event_base_dispatch(base);
for (i = 0; i < num_workers; i++) {
struct worker *w = &workers[i];
pthread_join(w->thread, NULL);
DEBUG(&null_worker, "Worker %02d terminated", w->id);
}
free(workers);
event_free(signal_event);
event_free(accept_event);
event_base_free(base);
close(fd);
return EXIT_SUCCESS;
error:
if (workers != NULL)
free(workers);
if (signal_event != NULL)
event_free(signal_event);
if (accept_event != NULL)
event_free(accept_event);
if (base != NULL)
event_base_free(base);
if (fd != -1)
close(fd);
return EXIT_FAILURE;
}
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