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authorGravatar Nikias Bassen2009-02-20 11:24:52 +0100
committerGravatar Nikias Bassen2009-02-20 11:24:52 +0100
commit71d8775f865b431135cd3c178763d0a294b8ff9e (patch)
tree2d6ea791e24db2d206ad943dce42b3cec5557d43 /sock_stuff.c
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initial import
Diffstat (limited to 'sock_stuff.c')
-rw-r--r--sock_stuff.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/sock_stuff.c b/sock_stuff.c
new file mode 100644
index 0000000..1a23bc1
--- /dev/null
+++ b/sock_stuff.c
@@ -0,0 +1,277 @@
+#include <stdio.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include "sock_stuff.h"
+
+#define RECV_TIMEOUT 10000
+
+int create_unix_socket (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");
+ close(sock);
+ return -1;
+ }
+
+ if (listen(sock, 10) < 0) {
+ perror("listen");
+ close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+
+int connect_unix_socket(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) {
+ 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)) {
+ 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) {
+ 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) {
+ close(sfd);
+ fprintf(stderr, "%s: connect: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+
+ return sfd;
+}
+
+int create_socket(uint16_t port)
+{
+ int sfd = -1;
+ int yes = 1;
+ 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, &yes, sizeof(int)) == -1) {
+ perror("setsockopt()");
+ 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()");
+ close(sfd);
+ return -1;
+ }
+
+ if (listen(sfd, 1) == -1) {
+ perror("listen()");
+ close(sfd);
+ return -1;
+ }
+
+ return sfd;
+}
+
+int connect_socket(const char *addr, uint16_t port)
+{
+ int sfd = -1;
+ int yes = 1;
+ struct hostent *hp;
+ struct sockaddr_in saddr;
+
+ if (!addr) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if ((hp = gethostbyname(addr)) == NULL) {
+ fprintf(stderr, "%s: unknown host '%s'\n", __func__, addr);
+ return -1;
+ }
+
+ if (!hp->h_addr) {
+ 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, &yes, sizeof(int)) == -1) {
+ perror("setsockopt()");
+ 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");
+ close(sfd);
+ return -2;
+ }
+
+ return sfd;
+}
+
+int check_fd(int fd, fd_mode fdm, unsigned int timeout)
+{
+ fd_set fds;
+ int sret;
+ int eagain;
+ struct timeval to;
+
+ if (fd <= 0) {
+ fprintf(stderr, "ERROR: invalid fd in check_fd %d\n", fd);
+ return -1;
+ }
+
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+
+ to.tv_sec = (time_t)(timeout/1000);
+ to.tv_usec = (time_t)((timeout-(to.tv_sec*1000))*1000);
+
+ sret = -1;
+
+ do {
+ eagain = 0;
+ switch(fdm) {
+ case fdread:
+ sret = select(fd+1,&fds,NULL,NULL,&to);
+ break;
+ case fdwrite:
+ sret = select(fd+1,NULL,&fds,NULL,&to);
+ break;
+ case fdexcept:
+ sret = select(fd+1,NULL,NULL,&fds,&to);
+ break;
+ }
+
+ if (sret < 0) {
+ switch(errno) {
+ case EINTR:
+ // interrupt signal in select
+ fprintf(stderr, "%s: EINTR\n", __func__);
+ eagain = 1;
+ break;
+ case EAGAIN:
+ fprintf(stderr, "%s: EAGAIN\n", __func__);
+ break;
+ default:
+ fprintf(stderr, "%s: select failed: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+ }
+ } while (eagain);
+
+ return sret;
+}
+
+int recv_buf(int fd, void *data, size_t length)
+{
+ return recv_buf_timeout(fd, data, length, 0, RECV_TIMEOUT);
+}
+
+int peek_buf(int fd, void *data, size_t length)
+{
+ return recv_buf_timeout(fd, data, length, MSG_PEEK, RECV_TIMEOUT);
+}
+
+int recv_buf_timeout(int fd, void *data, size_t length, int flags, unsigned int timeout)
+{
+ int res;
+ int result;
+
+ // check if data is available
+ res = check_fd(fd, fdread, 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
+ fprintf(stderr, "%s: fd=%d\n", __func__, fd);
+ return -1;
+ }
+ return result;
+}
+
+int send_buf(int fd, void *data, size_t length)
+{
+ return send(fd, data, length, 0);
+}
+