得到iphone的IP地址源码 .
屠瑞
定义了几个方法，获取iphone的IP地址。
IPAdress.h
01.#define MAXADDRS 32
02.extern char *if_names[MAXADDRS];
03.extern char *ip_names[MAXADDRS];
04.extern char *hw_addrs[MAXADDRS];
05.extern unsigned long ip_addrs[MAXADDRS];
06.// Function prototypes
07.void InitAddresses();
08.void FreeAddresses();
09.void GetIPAddresses();
10.void GetHWAddresses();
IPAddress.c
01.#include <stdio.h>
02.#include <stdlib.h>
03.#include <string.h>
04.#include <unistd.h>
05.#include <sys/ioctl.h>
06.#include <sys/types.h>
07.#include <sys/socket.h>
08.#include <netinet/in.h>
09.#include <netdb.h>
10.#include <arpa/inet.h>
11.#include <sys/sockio.h>
12.#include <net/if.h>
13.#include <errno.h>
14.#include <net/if_dl.h>
15.#include "GetAddresses.h"
16.#define min(a,b) ((a) < (b) ? (a) : (b))
17.#define max(a,b) ((a) > (b) ? (a) : (b))
18.#define BUFFERSIZE 4000
19.char *if_names[MAXADDRS];
20.char *ip_names[MAXADDRS];
21.char *hw_addrs[MAXADDRS];
22.unsigned long ip_addrs[MAXADDRS];
23.static int nextAddr = 0;
24.void InitAddresses()
25.{
26. int i;
27. for (i=0; i<MAXADDRS; ++i)
28. {
29. if_names[i] = ip_names[i] = hw_addrs[i] = NULL;
30. ip_addrs[i] = 0;
31. }
32.}
33.void FreeAddresses()
34.{
35. int i;
36. for (i=0; i<MAXADDRS; ++i)
37. {
38. if (if_names[i] != 0) free(if_names[i]);
39. if (ip_names[i] != 0) free(ip_names[i]);
40. if (hw_addrs[i] != 0) free(hw_addrs[i]);
41. ip_addrs[i] = 0;
42. }
43. InitAddresses();
44.}
45.void GetIPAddresses()
46.{
47. int i, len, flags;
48. char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
49. struct ifconf ifc;
50. struct ifreq *ifr, ifrcopy;
51. struct sockaddr_in *sin;
52. char temp[80];
53. int sockfd;
54. for (i=0; i<MAXADDRS; ++i)
55. {
56. if_names[i] = ip_names[i] = NULL;
57. ip_addrs[i] = 0;
58. }
59. sockfd = socket(AF_INET, SOCK_DGRAM, 0);
60. if (sockfd < 0)
61. {
62. perror("socket failed");
63. return;
64. }
65.
66. ifc.ifc_len = BUFFERSIZE;
67. ifc.ifc_buf = buffer;
68.
69. if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
70. {
71. perror("ioctl error");
72. return;
73. }
74.
75. lastname[0] = 0;
76.
77. for (ptr = buffer; ptr < buffer + ifc.ifc_len; )
78. {
79. ifr = (struct ifreq *)ptr;
80. len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
81. ptr += sizeof(ifr->ifr_name) + len; // for next one in buffer
82.
83. if (ifr->ifr_addr.sa_family != AF_INET)
84. {
85. continue; // ignore if not desired address family
86. }
87.
88. if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL)
89. {
90. *cptr = 0; // replace colon will null
91. }
92.
93. if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)
94. {
95. continue; /* already processed this interface */
96. }
97.
98. memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
99.
100. ifrcopy = *ifr;
101. ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
102. flags = ifrcopy.ifr_flags;
103. if ((flags & IFF_UP) == 0)
104. {
105. continue; // ignore if interface not up
106. }
107.
108. if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+1);
109. if (if_names[nextAddr] == NULL)
110. {
111. return;
112. }
113. strcpy(if_names[nextAddr], ifr->ifr_name);
114.
115. sin = (struct sockaddr_in *)&ifr->ifr_addr;
116. strcpy(temp, inet_ntoa(sin->sin_addr));
117.
118. ip_names[nextAddr] = (char *)malloc(strlen(temp)+1);
119. if (ip_names[nextAddr] == NULL)
120. {
121. return;
122. }
123. strcpy(ip_names[nextAddr], temp);
124. ip_addrs[nextAddr] = sin->sin_addr.s_addr;
125. ++nextAddr;
126. }
127.
128. close(sockfd);
129.}
130.void GetHWAddresses()
131.{
132. struct ifconf ifc;
133. struct ifreq *ifr;
134. int i, sockfd;
135. char buffer[BUFFERSIZE], *cp, *cplim;
136. char temp[80];
137. for (i=0; i<MAXADDRS; ++i)
138. {
139. hw_addrs[i] = NULL;
140. }
141. sockfd = socket(AF_INET, SOCK_DGRAM, 0);
142. if (sockfd < 0)
143. {
144. perror("socket failed");
145. return;
146. }
147. ifc.ifc_len = BUFFERSIZE;
148. ifc.ifc_buf = buffer;
149. if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)
150. {
151. perror("ioctl error");
152. close(sockfd);
153. return;
154. }
155. ifr = ifc.ifc_req;
156. cplim = buffer + ifc.ifc_len;
157. for (cp=buffer; cp < cplim; )
158. {
159. ifr = (struct ifreq *)cp;
160. if (ifr->ifr_addr.sa_family == AF_LINK)
161. {
162. struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
163. int a,b,c,d,e,f;
164. int i;
165. strcpy(temp, (char *)ether_ntoa(LLADDR(sdl)));
166. sscanf(temp, "%x:%x:%x:%x:%x:%x", &a, &b, &c, &d, &e, &f);
167. sprintf(temp, "%02X:%02X:%02X:%02X:%02X:%02X",a,b,c,d,e,f);
168. for (i=0; i<MAXADDRS; ++i)
169. {
170. if ((if_names[i] != NULL) && (strcmp(ifr->ifr_name, if_names[i]) == 0))
171. {
172. if (hw_addrs[i] == NULL)
173. {
174. hw_addrs[i] = (char *)malloc(strlen(temp)+1);
175. strcpy(hw_addrs[i], temp);
176. break;
177. }
178. }
179. }
180. }
181. cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);
182. }
183. close(sockfd);
184.} 如何用呢， 我们在MyAppAppDelegate.h中如下
01.#import <UIKit/UIKit.h>
02.@interface MyAppAppDelegate : NSObject <UIApplicationDelegate> {
03. NSString *localIP;
04.}
05.@property (nonatomic, retain) NSString *localIP;
06.- (NSString *)deviceIPAdress;
07.@end
MyAppDelegate.m
01.- (void)applicationDidFinishLaunching:(UIApplication *)application {
02. self.localIP = [self deviceIPAdress];
03. ...
04.}
05.- (NSString *)deviceIPAdress {
06. InitAddresses();
07. GetIPAddresses();
08. GetHWAddresses();
09.
10. /*
11. int i;
12. NSString *deviceIP;
13. for (i=0; i<MAXADDRS; ++i)
14. {
15. static unsigned long localHost = 0x7F000001; // 127.0.0.1
16. unsigned long theAddr;
17.
18. theAddr = ip_addrs[i];
19.
20. if (theAddr == 0) break;
21. if (theAddr == localHost) continue;
22.
23. NSLog(@"%s %s %s/n", if_names[i], hw_addrs[i], ip_names[i]);
24. }
25. deviceIP = [NSString stringWithFormat:@"%s", ip_names[i]];
26. */
27.
28. //this will get you the right IP from your device in format like 198.111.222.444. If you use the for loop above you will se that ip_names array will also contain localhost IP 127.0.0.1 that's why I don't use it. Eventualy this was code from mac that's why it uses arrays for ip_names as macs can have multiple IPs
29. return [NSString stringWithFormat:@"%s", ip_names[1]];
30.}
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