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-rw-r--r--src/socket.c392
1 files changed, 392 insertions, 0 deletions
diff --git a/src/socket.c b/src/socket.c
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+++ b/src/socket.c
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+/*
+ * socket.c
+ *
+ * Copyright (c) 2012 Martin Szulecki All Rights Reserved.
+ * Copyright (c) 2012 Nikias Bassen All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#ifdef WIN32
+#include <winsock2.h>
+#include <windows.h>
+static int wsa_init = 0;
+#else
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#endif
+#include "socket.h"
+
+#define RECV_TIMEOUT 20000
+
+static int verbose = 0;
+
+void socket_set_verbose(int level)
+{
+ verbose = level;
+}
+
+#ifndef WIN32
+int socket_create_unix(const char *filename)
+{
+ struct sockaddr_un name;
+ int sock;
+ size_t size;
+
+ // remove if still present
+ unlink(filename);
+
+ /* Create the socket. */
+ sock = socket(PF_LOCAL, SOCK_STREAM, 0);
+ if (sock < 0) {
+ perror("socket");
+ return -1;
+ }
+
+ /* Bind a name to the socket. */
+ name.sun_family = AF_LOCAL;
+ strncpy(name.sun_path, filename, sizeof(name.sun_path));
+ name.sun_path[sizeof(name.sun_path) - 1] = '\0';
+
+ /* The size of the address is
+ the offset of the start of the filename,
+ plus its length,
+ plus one for the terminating null byte.
+ Alternatively you can just do:
+ size = SUN_LEN (&name);
+ */
+ size = (offsetof(struct sockaddr_un, sun_path)
+ + strlen(name.sun_path) + 1);
+
+ if (bind(sock, (struct sockaddr *) &name, size) < 0) {
+ perror("bind");
+ socket_close(sock);
+ return -1;
+ }
+
+ if (listen(sock, 10) < 0) {
+ perror("listen");
+ socket_close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+
+int socket_connect_unix(const char *filename)
+{
+ struct sockaddr_un name;
+ int sfd = -1;
+ size_t size;
+ struct stat fst;
+
+ // check if socket file exists...
+ if (stat(filename, &fst) != 0) {
+ if (verbose >= 2)
+ fprintf(stderr, "%s: stat '%s': %s\n", __func__, filename,
+ strerror(errno));
+ return -1;
+ }
+ // ... and if it is a unix domain socket
+ if (!S_ISSOCK(fst.st_mode)) {
+ if (verbose >= 2)
+ fprintf(stderr, "%s: File '%s' is not a socket!\n", __func__,
+ filename);
+ return -1;
+ }
+ // make a new socket
+ if ((sfd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
+ if (verbose >= 2)
+ fprintf(stderr, "%s: socket: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+ // and connect to 'filename'
+ name.sun_family = AF_LOCAL;
+ strncpy(name.sun_path, filename, sizeof(name.sun_path));
+ name.sun_path[sizeof(name.sun_path) - 1] = 0;
+
+ size = (offsetof(struct sockaddr_un, sun_path)
+ + strlen(name.sun_path) + 1);
+
+ if (connect(sfd, (struct sockaddr *) &name, size) < 0) {
+ socket_close(sfd);
+ if (verbose >= 2)
+ fprintf(stderr, "%s: connect: %s\n", __func__,
+ strerror(errno));
+ return -1;
+ }
+
+ return sfd;
+}
+#endif
+
+int socket_create(uint16_t port)
+{
+ int sfd = -1;
+ int yes = 1;
+#ifdef WIN32
+ WSADATA wsa_data;
+ if (!wsa_init) {
+ if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) {
+ fprintf(stderr, "WSAStartup failed!\n");
+ ExitProcess(-1);
+ }
+ wsa_init = 1;
+ }
+#endif
+ struct sockaddr_in saddr;
+
+ if (0 > (sfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))) {
+ perror("socket()");
+ return -1;
+ }
+
+ if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(int)) == -1) {
+ perror("setsockopt()");
+ socket_close(sfd);
+ return -1;
+ }
+
+ memset((void *) &saddr, 0, sizeof(saddr));
+ saddr.sin_family = AF_INET;
+ saddr.sin_addr.s_addr = htonl(INADDR_ANY);
+ saddr.sin_port = htons(port);
+
+ if (0 > bind(sfd, (struct sockaddr *) &saddr, sizeof(saddr))) {
+ perror("bind()");
+ socket_close(sfd);
+ return -1;
+ }
+
+ if (listen(sfd, 1) == -1) {
+ perror("listen()");
+ socket_close(sfd);
+ return -1;
+ }
+
+ return sfd;
+}
+
+int socket_connect(const char *addr, uint16_t port)
+{
+ int sfd = -1;
+ int yes = 1;
+ struct hostent *hp;
+ struct sockaddr_in saddr;
+#ifdef WIN32
+ WSADATA wsa_data;
+ if (!wsa_init) {
+ if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) {
+ fprintf(stderr, "WSAStartup failed!\n");
+ ExitProcess(-1);
+ }
+ wsa_init = 1;
+ }
+#endif
+
+ if (!addr) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if ((hp = gethostbyname(addr)) == NULL) {
+ if (verbose >= 2)
+ fprintf(stderr, "%s: unknown host '%s'\n", __func__, addr);
+ return -1;
+ }
+
+ if (!hp->h_addr) {
+ if (verbose >= 2)
+ fprintf(stderr, "%s: gethostbyname returned NULL address!\n",
+ __func__);
+ return -1;
+ }
+
+ if (0 > (sfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))) {
+ perror("socket()");
+ return -1;
+ }
+
+ if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(int)) == -1) {
+ perror("setsockopt()");
+ socket_close(sfd);
+ return -1;
+ }
+
+ memset((void *) &saddr, 0, sizeof(saddr));
+ saddr.sin_family = AF_INET;
+ saddr.sin_addr.s_addr = *(uint32_t *) hp->h_addr;
+ saddr.sin_port = htons(port);
+
+ if (connect(sfd, (struct sockaddr *) &saddr, sizeof(saddr)) < 0) {
+ perror("connect");
+ socket_close(sfd);
+ return -2;
+ }
+
+ return sfd;
+}
+
+int socket_check_fd(int fd, fd_mode fdm, unsigned int timeout)
+{
+ fd_set fds;
+ int sret;
+ int eagain;
+ struct timeval to;
+ struct timeval *pto;
+
+ if (fd <= 0) {
+ if (verbose >= 2)
+ fprintf(stderr, "ERROR: invalid fd in check_fd %d\n", fd);
+ return -1;
+ }
+
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+
+ if (timeout > 0) {
+ to.tv_sec = (time_t) (timeout / 1000);
+ to.tv_usec = (time_t) ((timeout - (to.tv_sec * 1000)) * 1000);
+ pto = &to;
+ } else {
+ pto = NULL;
+ }
+
+ sret = -1;
+
+ do {
+ eagain = 0;
+ switch (fdm) {
+ case FDM_READ:
+ sret = select(fd + 1, &fds, NULL, NULL, pto);
+ break;
+ case FDM_WRITE:
+ sret = select(fd + 1, NULL, &fds, NULL, pto);
+ break;
+ case FDM_EXCEPT:
+ sret = select(fd + 1, NULL, NULL, &fds, pto);
+ break;
+ default:
+ return -1;
+ }
+
+ if (sret < 0) {
+ switch (errno) {
+ case EINTR:
+ // interrupt signal in select
+ if (verbose >= 2)
+ fprintf(stderr, "%s: EINTR\n", __func__);
+ eagain = 1;
+ break;
+ case EAGAIN:
+ if (verbose >= 2)
+ fprintf(stderr, "%s: EAGAIN\n", __func__);
+ break;
+ default:
+ if (verbose >= 2)
+ fprintf(stderr, "%s: select failed: %s\n", __func__,
+ strerror(errno));
+ return -1;
+ }
+ }
+ } while (eagain);
+
+ return sret;
+}
+
+int socket_accept(int fd, uint16_t port)
+{
+#ifdef WIN32
+ int addr_len;
+#else
+ socklen_t addr_len;
+#endif
+ int result;
+ struct sockaddr_in addr;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ addr.sin_port = htons(port);
+
+ addr_len = sizeof(addr);
+ result = accept(fd, (struct sockaddr*)&addr, &addr_len);
+
+ return result;
+}
+
+int socket_shutdown(int fd, int how)
+{
+ return shutdown(fd, how);
+}
+
+int socket_close(int fd) {
+#ifdef WIN32
+ return closesocket(fd);
+#else
+ return close(fd);
+#endif
+}
+
+int socket_receive(int fd, void *data, size_t length)
+{
+ return socket_receive_timeout(fd, data, length, 0, RECV_TIMEOUT);
+}
+
+int socket_peek(int fd, void *data, size_t length)
+{
+ return socket_receive_timeout(fd, data, length, MSG_PEEK, RECV_TIMEOUT);
+}
+
+int socket_receive_timeout(int fd, void *data, size_t length, int flags,
+ unsigned int timeout)
+{
+ int res;
+ int result;
+
+ // check if data is available
+ res = socket_check_fd(fd, FDM_READ, timeout);
+ if (res <= 0) {
+ return res;
+ }
+ // if we get here, there _is_ data available
+ result = recv(fd, data, length, flags);
+ if (res > 0 && result == 0) {
+ // but this is an error condition
+ if (verbose >= 3)
+ fprintf(stderr, "%s: fd=%d recv returned 0\n", __func__, fd);
+ return -EAGAIN;
+ }
+ if (result < 0) {
+ return -errno;
+ }
+ return result;
+}
+
+int socket_send(int fd, void *data, size_t length)
+{
+ return send(fd, data, length, 0);
+}