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