Merge branch 'master' of ssh://gapil.gnulinux.it/srv/git/gapil

[gapil.git] / sources / SockUtil.c

diff --git a/sources/SockUtil.c b/sources/SockUtil.c
index 0bbaa79605fec851784e93ca729ccf1825f746e9..af3a3f7c59990b0ff43853efd16ece5dc3549ac0 100644 (file)
--- a/sources/SockUtil.c
+++ b/sources/SockUtil.c
@@ -1,4 +1,4 @@
-/* Sockutils.c
+/* SockUtil.c
  * 
  * Copyright (C) 2004 Simone Piccardi
  * 
@@ -18,26 +18,22 @@
  */
 /***************************************************************
  *
- * File SockUtils.c 
+ * File SockUtil.c 
  * Routines for socket operations. 
  *
  * Define routines for socket handling 
  *
  * Author: S. Piccardi
  *
- * $Id$
- *
  ***************************************************************/
-#include <sys/types.h>
-#include <stdio.h>                                 /* standard I/O functions */
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <arpa/inet.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <netdb.h>
+#include <sys/types.h>   /* primitive system data types */
+#include <stdio.h>      /* standard I/O library */
+#include <unistd.h>      /* unix standard library */
+#include <string.h>      /* C strings library */
+#include <errno.h>       /* error definitions and routines */
+#include <sys/socket.h>  /* socket constants, types and functions */
+#include <arpa/inet.h>   /* IP addresses conversion utilities */
+#include <netdb.h>       /* C resolver library */
 
 #include "macros.h"
 /**************************************************************************
@@ -50,8 +46,6 @@
  * Author: Simone Piccardi
  * Dec. 2004
  *
- * $Id$ 
- *
  **************************************************************************/
 char *ip_ntop(struct addrinfo *addr, char *dst, socklen_t cnt)
 {
@@ -82,8 +76,6 @@ char *ip_ntop(struct addrinfo *addr, char *dst, socklen_t cnt)
  * Author: Simone Piccardi
  * Dec. 2004
  *
- * $Id$ 
- *
  ****************************************************************/
 int sockconn(char *host, char *serv, int prot, int type) 
 {
@@ -140,8 +132,6 @@ int sockconn(char *host, char *serv, int prot, int type)
  * Author: Simone Piccardi
  * Dec. 2004
  *
- * $Id$ 
- *
  ****************************************************************/
 int sockbind(char *host, char *serv, int prot, int type) 
 {
@@ -193,3 +183,68 @@ int sockbind(char *host, char *serv, int prot, int type)
     freeaddrinfo(save);                    /* done, release memory */
     return sock;
 }
+/****************************************************************
+ *
+ * Routine sockbindopt
+ * Return a binded socket given hostname, service, and socket type
+ * Issue a SO_REUSEADDR on the socket before binding on reuse value.
+ *
+ * Author: Simone Piccardi
+ * Mar. 2005
+ *
+ ****************************************************************/
+int sockbindopt(char *host, char *serv, int prot, int type, int reuse) 
+{
+    struct addrinfo hint, *addr, *save;
+    int res;
+    int sock;
+    char buf[INET6_ADDRSTRLEN];
+    /* initialize hint structure */
+    memset(&hint, 0, sizeof(struct addrinfo)); 
+    hint.ai_flags = AI_PASSIVE;            /* address for binding */
+    hint.ai_family = PF_UNSPEC;            /* generic address (IPv4 or IPv6) */
+    hint.ai_protocol = prot;               /* protocol */
+    hint.ai_socktype = type;               /* socket type */
+    res = getaddrinfo(host, serv, &hint, &addr);   /* calling getaddrinfo */
+    if (res != 0) {                                /* on error exit */
+       fprintf(stderr, "sockbind: resolution failed:");
+//     fprintf(stderr, "host %s, service %s, protocol %d", host, serv, prot);
+       fprintf(stderr, " %s\n", gai_strerror(res));
+       errno = 0;                         /* clear errno */
+       return -1;
+    }
+    save = addr;                           /* saving for freeaddrinfo */
+    while (addr != NULL) {                 /* loop on possible addresses */
+       /* get a socket */
+       sock = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
+       if (sock < 0) {                    /* on error */
+           if (addr->ai_next != NULL) {   /* if other addresses */
+               addr=addr->ai_next;        /* take next */
+               continue;                  /* restart cycle */
+           } else {                       /* else stop */
+               perror("sockbind: cannot create socket");
+               return sock;
+           }
+       }
+       /* connect the socket */
+       if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, 
+                      &reuse, sizeof(reuse))) {
+           printf("error on socket options\n");
+           return -1;
+       }
+       printf("Indirizzo %s\n", ip_ntop(addr, buf, sizeof(buf)));
+       if ( (res = bind(sock, addr->ai_addr, addr->ai_addrlen)) < 0) {
+           if (addr->ai_next != NULL) {   /* if other addresses */
+               addr=addr->ai_next;        /* take next */
+               close(sock);               /* close socket */
+               continue;                  /* restart cycle */
+           } else {                       /* else stop */
+               perror("sockbind: cannot connect");
+               close(sock);
+               return res;
+           }
+       } else break;                      /* ok, we are binded! */
+    }
+    freeaddrinfo(save);                    /* done, release memory */
+    return sock;
+}