Троан Эрик В.
Шрифт:
43: flags |= NI_NUMERICSERV;
44: } else if (!strcmp (*ptr, "--namereqd")) {
45: flags |= NI_NAMEREQD;
46: } else if (!strcmp(*ptr, "--nofqdn")) {
47: flags |= NI_NOFQDN;
48: } else if (!strcmp (*ptr, "--udp")) {
49: flags |= NI_DGRAM;
50: } else if (!strcmp(*ptr, "--host")) {
51: ptr++;
52: if (!*ptr) usage;
53: hostAddress = *ptr;
54: } else if (!strcmp(*ptr, "--service")) {
55: ptr++;
56: if (!*ptr) usage;
57: serviceAddress = *ptr;
58: } else
59: usage;
60:
61: ptr++;
62: }
63:
64: /* необходимы адреса hostAddress, serviceAddress или оба */
65: if (!hostAddress && !serviceAddress)
66: usage;
67:
68: if (serviceAddress) {
69: char * end;
70:
71: portNum = htons(strtol(serviceAddress, &end, 0));
72: if (*end) {
73: fprintf(stderr, "сбой при преобразовании %s в число\n",
74: serviceAddress);
75: return 1;
76: }
77: }
78:
79: if (!hostAddress) {
80: addr4.sin_family = AF_INET;
81: addr4.sin_port = portNum;
82: } else if (!strchr(hostAddress, ':')) {
83: /* Если hostAddress содержит двоеточие, то предполагаем версию IPv6.
84: В противном случае это IPv4 */
85:
86: if (inet_pton(AF_INET, hostAddress,
87: &addr4.sin_addr) <= 0) {
88: fprintf(stderr, "ошибка преобразования IPv4-адреса %s\n",
89: hostAddress);
90: return 1;
91: }
92:
93: addr4.sin_family = AF_INET;
94: addr4.sin_port = portNum;
95: } else {
96:
97: memset(&addr6, 0, sizeof(addr6));
98:
99: if (inet_pton(AF_INET6, hostAddress,
100: &addr6.sin6_addr) <= 0) {
101: fprintf(stderr, "ошибка преобразования IPv6-адреса %s\n",
102: hostAddress);
103: return 1;
104: }
105:
106: addr6.sin6_family = AF_INET6;
107: addr6.sin6_port = portNum;
108: addr = (struct sockaddr *) &addr6;
109: addrLen = sizeof(addr6);
110: }
111:
112: if (!serviceAddress) {
113: rc = getnameinfo(addr, addrLen, hostName, sizeof(hostName),
114: NULL, 0, flags);
115: } else if (!hostAddress) {
116: rc = getnameinfo(addr, addrLen, NULL, 0,
117: serviceName, sizeof(serviceName), flags);
118: } else {
119: rc = getnameinfo(addr, addrLen, hostName, sizeof(hostName),
120: serviceName, sizeof(serviceName), flags);
121: }
122:
123: if (rc) {
124: fprintf(stderr, "сбой обратного поиска: %s\n",
125: gai_strerror(rc));
126: return 1;
127: }
128:
129: if (hostAddress)