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SSL for async I/O

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This commit is contained in:
Mark Nunberg 2017-11-27 15:49:28 -05:00
parent ba947bc93c
commit 08efa46599
5 changed files with 197 additions and 4 deletions
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6
Makefile
View File

@ -4,7 +4,8 @@
# This file is released under the BSD license, see the COPYING file
OBJ=net.o hiredis.o sds.o async.o read.o sslio.o
EXAMPLES=hiredis-example hiredis-example-libevent hiredis-example-libev hiredis-example-glib hiredis-example-ssl
EXAMPLES=hiredis-example hiredis-example-libevent hiredis-example-libev hiredis-example-glib \
hiredis-example-ssl hiredis-example-libevent-ssl
TESTS=hiredis-test
LIBNAME=libhiredis
PKGCONFNAME=hiredis.pc
@ -94,6 +95,9 @@ static: $(STLIBNAME)
hiredis-example-libevent: examples/example-libevent.c adapters/libevent.h $(STLIBNAME)
$(CC) -o examples/$@ $(REAL_CFLAGS) $(REAL_LDFLAGS) -I. $< -levent $(STLIBNAME)
hiredis-example-libevent-ssl: examples/example-libevent-ssl.c adapters/libevent.h $(STLIBNAME)
$(CC) -o examples/$@ $(REAL_CFLAGS) $(REAL_LDFLAGS) -I. $< -levent $(STLIBNAME)
hiredis-example-libev: examples/example-libev.c adapters/libev.h $(STLIBNAME)
$(CC) -o examples/$@ $(REAL_CFLAGS) $(REAL_LDFLAGS) -I. $< -lev $(STLIBNAME)

92
async.c
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@ -40,6 +40,7 @@
#include "net.h"
#include "dict.c"
#include "sds.h"
#include "sslio.h"
#define _EL_ADD_READ(ctx) do { \
if ((ctx)->ev.addRead) (ctx)->ev.addRead((ctx)->ev.data); \
@ -524,6 +525,87 @@ static int __redisAsyncHandleConnect(redisAsyncContext *ac) {
}
}
#ifndef HIREDIS_NOSSL
/**
* Handle SSL when socket becomes available for reading. This also handles
* read-while-write and write-while-read
*/
static void asyncSslRead(redisAsyncContext *ac) {
int rv;
redisSsl *ssl = ac->c.ssl;
redisContext *c = &ac->c;
ssl->wantRead = 0;
if (ssl->pendingWrite) {
int done;
/* This is probably just a write event */
ssl->pendingWrite = 0;
rv = redisBufferWrite(c, &done);
if (rv == REDIS_ERR) {
__redisAsyncDisconnect(ac);
return;
} else if (!done) {
_EL_ADD_WRITE(ac);
}
}
rv = redisBufferRead(c);
if (rv == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
_EL_ADD_READ(ac);
redisProcessCallbacks(ac);
}
}
/**
* Handle SSL when socket becomes available for writing
*/
static void asyncSslWrite(redisAsyncContext *ac) {
int rv, done = 0;
redisSsl *ssl = ac->c.ssl;
redisContext *c = &ac->c;
ssl->pendingWrite = 0;
rv = redisBufferWrite(c, &done);
if (rv == REDIS_ERR) {
__redisAsyncDisconnect(ac);
return;
}
if (!done) {
if (ssl->wantRead) {
/* Need to read-before-write */
ssl->pendingWrite = 1;
_EL_DEL_WRITE(ac);
} else {
/* No extra reads needed, just need to write more */
_EL_ADD_WRITE(ac);
}
} else {
/* Already done! */
_EL_DEL_WRITE(ac);
}
/* Always reschedule a read */
_EL_ADD_READ(ac);
}
#else
/* Just so we're able to compile */
static void asyncSslRead(redisAsyncContext *ac) {
abort();
(void)ac;
}
static void asyncSslWrite(redisAsyncContext *ac) {
abort();
(void)ac;
}
#endif
/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
@ -539,6 +621,11 @@ void redisAsyncHandleRead(redisAsyncContext *ac) {
return;
}
if (c->flags & REDIS_SSL) {
asyncSslRead(ac);
return;
}
if (redisBufferRead(c) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
@ -561,6 +648,11 @@ void redisAsyncHandleWrite(redisAsyncContext *ac) {
return;
}
if (c->flags & REDIS_SSL) {
asyncSslWrite(ac);
return;
}
if (redisBufferWrite(c,&done) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {

72
examples/example-libevent-ssl.c Normal file
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@ -0,0 +1,72 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <hiredis.h>
#include <async.h>
#include <adapters/libevent.h>
void getCallback(redisAsyncContext *c, void *r, void *privdata) {
redisReply *reply = r;
if (reply == NULL) return;
printf("argv[%s]: %s\n", (char*)privdata, reply->str);
/* Disconnect after receiving the reply to GET */
redisAsyncDisconnect(c);
}
void connectCallback(const redisAsyncContext *c, int status) {
if (status != REDIS_OK) {
printf("Error: %s\n", c->errstr);
return;
}
printf("Connected...\n");
}
void disconnectCallback(const redisAsyncContext *c, int status) {
if (status != REDIS_OK) {
printf("Error: %s\n", c->errstr);
return;
}
printf("Disconnected...\n");
}
int main (int argc, char **argv) {
signal(SIGPIPE, SIG_IGN);
struct event_base *base = event_base_new();
if (argc < 5) {
fprintf(stderr,
"Usage: %s <key> <host> <port> <cert> <certKey> [ca]\n", argv[0]);
exit(1);
}
const char *value = argv[1];
size_t nvalue = strlen(value);
const char *hostname = argv[2];
int port = atoi(argv[3]);
const char *cert = argv[4];
const char *certKey = argv[5];
const char *caCert = argc > 5 ? argv[6] : NULL;
redisAsyncContext *c = redisAsyncConnect(hostname, port);
if (c->err) {
/* Let *c leak for now... */
printf("Error: %s\n", c->errstr);
return 1;
}
if (redisSecureConnection(&c->c, caCert, cert, certKey) != REDIS_OK) {
printf("SSL Error!\n");
exit(1);
}
redisLibeventAttach(c,base);
redisAsyncSetConnectCallback(c,connectCallback);
redisAsyncSetDisconnectCallback(c,disconnectCallback);
redisAsyncCommand(c, NULL, NULL, "SET key %b", value, nvalue);
redisAsyncCommand(c, getCallback, (char*)"end-1", "GET key");
event_base_dispatch(base);
return 0;
}

22
sslio.c
View File

@ -99,7 +99,7 @@ int redisSslCreate(redisContext *c, const char *capath, const char *certpath,
redisSsl *s = c->ssl;
s->ctx = SSL_CTX_new(SSLv23_client_method());
/* SSL_CTX_set_info_callback(s->ctx, sslLogCallback); */
SSL_CTX_set_info_callback(s->ctx, sslLogCallback);
SSL_CTX_set_mode(s->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
SSL_CTX_set_options(s->ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
SSL_CTX_set_verify(s->ctx, SSL_VERIFY_PEER, NULL);
@ -153,6 +153,22 @@ int redisSslCreate(redisContext *c, const char *capath, const char *certpath,
return REDIS_ERR;
}
static int maybeCheckWant(redisSsl *rssl, int rv) {
/**
* If the error is WANT_READ or WANT_WRITE, the appropriate flags are set
* and true is returned. False is returned otherwise
*/
if (rv == SSL_ERROR_WANT_READ) {
rssl->wantRead = 1;
return 1;
} else if (rv == SSL_ERROR_WANT_WRITE) {
rssl->pendingWrite = 1;
return 1;
} else {
return 0;
}
}
int redisSslRead(redisContext *c, char *buf, size_t bufcap) {
int nread = SSL_read(c->ssl->ssl, buf, bufcap);
if (nread > 0) {
@ -162,7 +178,7 @@ int redisSslRead(redisContext *c, char *buf, size_t bufcap) {
return -1;
} else {
int err = SSL_get_error(c->ssl->ssl, nread);
if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
if (maybeCheckWant(c->ssl, err)) {
return 0;
} else {
__redisSetError(c, REDIS_ERR_IO, NULL);
@ -181,7 +197,7 @@ int redisSslWrite(redisContext *c) {
c->ssl->lastLen = len;
int err = SSL_get_error(c->ssl->ssl, rv);
if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
if (maybeCheckWant(c->ssl, err)) {
return 0;
} else {
__redisSetError(c, REDIS_ERR_IO, NULL);

9
sslio.h
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@ -33,6 +33,15 @@ typedef struct redisSsl {
* previously called with in the event of an SSL_read/SSL_write situation
*/
size_t lastLen;
/** Whether the SSL layer requires read (possibly before a write) */
int wantRead;
/**
* Whether a write was requested prior to a read. If set, the write()
* should resume whenever a read takes place, if possible
*/
int pendingWrite;
} redisSsl;
struct redisContext;