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// (C) 2013, 2016 Cybozu.
#include "yrmcds.h"
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
// workaround for a known-bug in NetBSD, from https://lists.gnu.org/archive/html/bug-gnulib/2010-02/msg00071.html
#ifndef AI_V4MAPPED
#define AI_V4MAPPED 0
#endif
static yrmcds_error connect_to_server(const char* node, uint16_t port, int* server_fd) {
if( node == NULL )
return YRMCDS_BAD_ARGUMENT;
long fl;
char sport[8];
snprintf(sport, sizeof(sport), "%u", (unsigned int)port);
struct addrinfo hint, *res;
memset(&hint, 0, sizeof(hint));
hint.ai_family = AF_INET; // prefer IPv4
hint.ai_socktype = SOCK_STREAM;
hint.ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG;
int e = getaddrinfo(node, sport, &hint, &res);
if( e == EAI_FAMILY || e == EAI_NONAME
#ifdef EAI_ADDRFAMILY
|| e == EAI_ADDRFAMILY
#endif
#ifdef EAI_NODATA
|| e == EAI_NODATA
#endif
) {
hint.ai_family = AF_INET6;
// intentionally drop AI_ADDRCONFIG to support IPv6 link-local address.
// see https://github.com/cybozu/yrmcds/issues/40
hint.ai_flags = AI_NUMERICSERV|AI_V4MAPPED;
e = getaddrinfo(node, sport, &hint, &res);
}
if( e == EAI_SYSTEM ) {
return YRMCDS_SYSTEM_ERROR;
} else if( e != 0 ) {
return YRMCDS_NOT_RESOLVED;
}
int s = socket(res->ai_family,
res->ai_socktype
#ifdef __linux__
| SOCK_NONBLOCK | SOCK_CLOEXEC
#endif
, res->ai_protocol);
if( s == -1 ) {
e = errno;
freeaddrinfo(res);
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
#ifndef __linux__
fl = fcntl(s, F_GETFD, 0);
fcntl(s, F_SETFD, fl | FD_CLOEXEC);
fl = fcntl(s, F_GETFL, 0);
fcntl(s, F_SETFL, fl | O_NONBLOCK);
#endif
e = connect(s, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
if( e == -1 && errno != EINPROGRESS ) {
e = errno;
close(s);
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
if( e != 0 ) {
struct pollfd fds;
fds.fd = s;
fds.events = POLLOUT;
int n = poll(&fds, 1, 5000);
if( n == 0 ) { // timeout
close(s);
return YRMCDS_TIMEOUT;
}
if( n == -1 ) {
e = errno;
close(s);
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
if( fds.revents & (POLLERR|POLLHUP|POLLNVAL) ) {
close(s);
return YRMCDS_DISCONNECTED;
}
socklen_t l = sizeof(e);
if( getsockopt(s, SOL_SOCKET, SO_ERROR, &e, &l) == -1 ) {
close(s);
return YRMCDS_SYSTEM_ERROR;
}
if( e != 0 ) {
close(s);
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
}
fl = fcntl(s, F_GETFL, 0);
if( fcntl(s, F_SETFL, fl & ~O_NONBLOCK) == -1 ) {
e = errno;
close(s);
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
int ok = 1;
if( setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &ok, sizeof(ok)) == -1 ) {
e = errno;
close(s);
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
*server_fd = s;
return YRMCDS_OK;
}
yrmcds_error yrmcds_connect(yrmcds* c, const char* node, uint16_t port) {
if( c == NULL )
return YRMCDS_BAD_ARGUMENT;
#ifndef LIBYRMCDS_NO_INTERNAL_LOCK
int e = pthread_mutex_init(&(c->lock), NULL);
if( e != 0 ) {
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
#endif // ! LIBYRMCDS_NO_INTERNAL_LOCK
int server_fd;
yrmcds_error err = connect_to_server(node, port, &server_fd);
if( err != YRMCDS_OK )
return err;
c->sock = server_fd;
c->serial = 0;
c->compress_size = 0;
c->recvbuf = (char*)malloc(1 << 20);
if( c->recvbuf == NULL ) {
close(server_fd);
#ifndef LIBYRMCDS_NO_INTERNAL_LOCK
pthread_mutex_destroy(&(c->lock));
#endif
return YRMCDS_OUT_OF_MEMORY;
}
c->capacity = 1 << 20;
c->used = 0;
c->last_size = 0;
c->decompressed = NULL;
c->invalid = 0;
c->text_mode = 0;
c->rserial = 0;
return YRMCDS_OK;
}
yrmcds_error yrmcds_cnt_connect(yrmcds_cnt* c, const char* node, uint16_t port) {
if( c == NULL )
return YRMCDS_BAD_ARGUMENT;
#ifndef LIBYRMCDS_NO_INTERNAL_LOCK
int e = pthread_mutex_init(&(c->lock), NULL);
if( e != 0 ) {
errno = e;
return YRMCDS_SYSTEM_ERROR;
}
#endif // ! LIBYRMCDS_NO_INTERNAL_LOCK
int server_fd;
yrmcds_error err = connect_to_server(node, port, &server_fd);
if( err != YRMCDS_OK )
return err;
c->sock = server_fd;
c->serial = 0;
c->recvbuf = (char*)malloc(4096);
if( c->recvbuf == NULL ) {
close(server_fd);
#ifndef LIBYRMCDS_NO_INTERNAL_LOCK
pthread_mutex_destroy(&(c->lock));
#endif
return YRMCDS_OUT_OF_MEMORY;
}
c->capacity = 4096;
c->used = 0;
c->last_size = 0;
c->invalid = 0;
c->stats.count = c->stats.capacity = 0;
c->stats.records = NULL;
return YRMCDS_OK;
}
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