aboutsummaryrefslogtreecommitdiff
path: root/openssl/demos/tunala/ip.c
diff options
context:
space:
mode:
Diffstat (limited to 'openssl/demos/tunala/ip.c')
-rw-r--r--openssl/demos/tunala/ip.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/openssl/demos/tunala/ip.c b/openssl/demos/tunala/ip.c
new file mode 100644
index 000000000..96ef4e653
--- /dev/null
+++ b/openssl/demos/tunala/ip.c
@@ -0,0 +1,146 @@
+#include "tunala.h"
+
+#ifndef NO_IP
+
+#define IP_LISTENER_BACKLOG 511 /* So if it gets masked by 256 or some other
+ such value it'll still be respectable */
+
+/* Any IP-related initialisations. For now, this means blocking SIGPIPE */
+int ip_initialise(void)
+{
+ struct sigaction sa;
+
+ sa.sa_handler = SIG_IGN;
+ sa.sa_flags = 0;
+ sigemptyset(&sa.sa_mask);
+ if(sigaction(SIGPIPE, &sa, NULL) != 0)
+ return 0;
+ return 1;
+}
+
+int ip_create_listener_split(const char *ip, unsigned short port)
+{
+ struct sockaddr_in in_addr;
+ int fd = -1;
+ int reuseVal = 1;
+
+ /* Create the socket */
+ if((fd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
+ goto err;
+ /* Set the SO_REUSEADDR flag - servers act weird without it */
+ if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)(&reuseVal),
+ sizeof(reuseVal)) != 0)
+ goto err;
+ /* Prepare the listen address stuff */
+ in_addr.sin_family = AF_INET;
+ memcpy(&in_addr.sin_addr.s_addr, ip, 4);
+ in_addr.sin_port = htons(port);
+ /* Bind to the required port/address/interface */
+ if(bind(fd, (struct sockaddr *)&in_addr, sizeof(struct sockaddr_in)) != 0)
+ goto err;
+ /* Start "listening" */
+ if(listen(fd, IP_LISTENER_BACKLOG) != 0)
+ goto err;
+ return fd;
+err:
+ if(fd != -1)
+ close(fd);
+ return -1;
+}
+
+int ip_create_connection_split(const char *ip, unsigned short port)
+{
+ struct sockaddr_in in_addr;
+ int flags, fd = -1;
+
+ /* Create the socket */
+ if((fd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
+ goto err;
+ /* Make it non-blocking */
+ if(((flags = fcntl(fd, F_GETFL, 0)) < 0) ||
+ (fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0))
+ goto err;
+ /* Prepare the connection address stuff */
+ in_addr.sin_family = AF_INET;
+ memcpy(&in_addr.sin_addr.s_addr, ip, 4);
+ in_addr.sin_port = htons(port);
+ /* Start a connect (non-blocking, in all likelihood) */
+ if((connect(fd, (struct sockaddr *)&in_addr,
+ sizeof(struct sockaddr_in)) != 0) &&
+ (errno != EINPROGRESS))
+ goto err;
+ return fd;
+err:
+ if(fd != -1)
+ close(fd);
+ return -1;
+}
+
+static char all_local_ip[] = {0x00,0x00,0x00,0x00};
+
+int ip_parse_address(const char *address, const char **parsed_ip,
+ unsigned short *parsed_port, int accept_all_ip)
+{
+ char buf[256];
+ struct hostent *lookup;
+ unsigned long port;
+ const char *ptr = strstr(address, ":");
+ const char *ip = all_local_ip;
+
+ if(!ptr) {
+ /* We assume we're listening on all local interfaces and have
+ * only specified a port. */
+ if(!accept_all_ip)
+ return 0;
+ ptr = address;
+ goto determine_port;
+ }
+ if((ptr - address) > 255)
+ return 0;
+ memset(buf, 0, 256);
+ memcpy(buf, address, ptr - address);
+ ptr++;
+ if((lookup = gethostbyname(buf)) == NULL) {
+ /* Spit a message to differentiate between lookup failures and
+ * bad strings. */
+ fprintf(stderr, "hostname lookup for '%s' failed\n", buf);
+ return 0;
+ }
+ ip = lookup->h_addr_list[0];
+determine_port:
+ if(strlen(ptr) < 1)
+ return 0;
+ if(!int_strtoul(ptr, &port) || (port > 65535))
+ return 0;
+ *parsed_ip = ip;
+ *parsed_port = (unsigned short)port;
+ return 1;
+}
+
+int ip_create_listener(const char *address)
+{
+ const char *ip;
+ unsigned short port;
+
+ if(!ip_parse_address(address, &ip, &port, 1))
+ return -1;
+ return ip_create_listener_split(ip, port);
+}
+
+int ip_create_connection(const char *address)
+{
+ const char *ip;
+ unsigned short port;
+
+ if(!ip_parse_address(address, &ip, &port, 0))
+ return -1;
+ return ip_create_connection_split(ip, port);
+}
+
+int ip_accept_connection(int listen_fd)
+{
+ return accept(listen_fd, NULL, NULL);
+}
+
+#endif /* !defined(NO_IP) */
+