crypto/external/bsd/openssl/dist/demos/tunala/ip.c

   1 #include "tunala.h"
   2
   3 #ifndef NO_IP
   4
   5 # define IP_LISTENER_BACKLOG 511/* So if it gets masked by 256 or some other
   6                                  * such value it'll still be respectable */
   7
   8 /* Any IP-related initialisations. For now, this means blocking SIGPIPE */
   9 int ip_initialise(void)
  10 {
  11     struct sigaction sa;
  12
  13     sa.sa_handler = SIG_IGN;
  14     sa.sa_flags = 0;
  15     sigemptyset(&sa.sa_mask);
  16     if (sigaction(SIGPIPE, &sa, NULL) != 0)
  17         return 0;
  18     return 1;
  19 }
  20
  21 int ip_create_listener_split(const char *ip, unsigned short port)
  22 {
  23     struct sockaddr_in in_addr;
  24     int fd = -1;
  25     int reuseVal = 1;
  26
  27     /* Create the socket */
  28     if ((fd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
  29         goto err;
  30     /* Set the SO_REUSEADDR flag - servers act weird without it */
  31     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)(&reuseVal),
  32                    sizeof(reuseVal)) != 0)
  33         goto err;
  34     /* Prepare the listen address stuff */
  35     in_addr.sin_family = AF_INET;
  36     memcpy(&in_addr.sin_addr.s_addr, ip, 4);
  37     in_addr.sin_port = htons(port);
  38     /* Bind to the required port/address/interface */
  39     if (bind(fd, (struct sockaddr *)&in_addr, sizeof(struct sockaddr_in)) !=
  40         0)
  41         goto err;
  42     /* Start "listening" */
  43     if (listen(fd, IP_LISTENER_BACKLOG) != 0)
  44         goto err;
  45     return fd;
  46  err:
  47     if (fd != -1)
  48         close(fd);
  49     return -1;
  50 }
  51
  52 int ip_create_connection_split(const char *ip, unsigned short port)
  53 {
  54     struct sockaddr_in in_addr;
  55     int flags, fd = -1;
  56
  57     /* Create the socket */
  58     if ((fd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
  59         goto err;
  60     /* Make it non-blocking */
  61     if (((flags = fcntl(fd, F_GETFL, 0)) < 0) ||
  62         (fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0))
  63         goto err;
  64     /* Prepare the connection address stuff */
  65     in_addr.sin_family = AF_INET;
  66     memcpy(&in_addr.sin_addr.s_addr, ip, 4);
  67     in_addr.sin_port = htons(port);
  68     /* Start a connect (non-blocking, in all likelihood) */
  69     if ((connect(fd, (struct sockaddr *)&in_addr,
  70                  sizeof(struct sockaddr_in)) != 0) && (errno != EINPROGRESS))
  71         goto err;
  72     return fd;
  73  err:
  74     if (fd != -1)
  75         close(fd);
  76     return -1;
  77 }
  78
  79 static char all_local_ip[] = { 0x00, 0x00, 0x00, 0x00 };
  80
  81 int ip_parse_address(const char *address, const char **parsed_ip,
  82                      unsigned short *parsed_port, int accept_all_ip)
  83 {
  84     char buf[256];
  85     struct hostent *lookup;
  86     unsigned long port;
  87     const char *ptr = strstr(address, ":");
  88     const char *ip = all_local_ip;
  89
  90     if (!ptr) {
  91         /*
  92          * We assume we're listening on all local interfaces and have only
  93          * specified a port.
  94          */
  95         if (!accept_all_ip)
  96             return 0;
  97         ptr = address;
  98         goto determine_port;
  99     }
 100     if ((ptr - address) > 255)
 101         return 0;
 102     memset(buf, 0, 256);
 103     memcpy(buf, address, ptr - address);
 104     ptr++;
 105     if ((lookup = gethostbyname(buf)) == NULL) {
 106         /*
 107          * Spit a message to differentiate between lookup failures and bad
 108          * strings.
 109          */
 110         fprintf(stderr, "hostname lookup for '%s' failed\n", buf);
 111         return 0;
 112     }
 113     ip = lookup->h_addr_list[0];
 114  determine_port:
 115     if (strlen(ptr) < 1)
 116         return 0;
 117     if (!int_strtoul(ptr, &port) || (port > 65535))
 118         return 0;
 119     *parsed_ip = ip;
 120     *parsed_port = (unsigned short)port;
 121     return 1;
 122 }
 123
 124 int ip_create_listener(const char *address)
 125 {
 126     const char *ip;
 127     unsigned short port;
 128
 129     if (!ip_parse_address(address, &ip, &port, 1))
 130         return -1;
 131     return ip_create_listener_split(ip, port);
 132 }
 133
 134 int ip_create_connection(const char *address)
 135 {
 136     const char *ip;
 137     unsigned short port;
 138
 139     if (!ip_parse_address(address, &ip, &port, 0))
 140         return -1;
 141     return ip_create_connection_split(ip, port);
 142 }
 143
 144 int ip_accept_connection(int listen_fd)
 145 {
 146     return accept(listen_fd, NULL, NULL);
 147 }
 148
 149 #endif                          /* !defined(NO_IP) */