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  • Xcode 获取本地IP

     1 //
     2 //  GetIPAddress.h 4 //
     5 //
     6 
     7 
     8 #define MAXADDRS    32  
     9 
    10 extern char *ip_names[MAXADDRS];  
    11 
    12 void InitAddresses();  
    13 void GetIPAddresses();  
    14 void GetHWAddresses();  
    //
    //  GetIPAddress.m//
    
    #include "GetIPAddress.h"
    #include <stdio.h>
    #include <stdlib.h> 
    #include <string.h> 
    #include <unistd.h> 
    #include <sys/ioctl.h> 
    #include <sys/types.h> 
    #include <sys/socket.h> 
    #include <netinet/in.h> 
    #include <netdb.h> 
    #include <arpa/inet.h> 
    #include <sys/sockio.h> 
    #include <net/ethernet.h>
    #include <net/if.h> 
    #include <errno.h> 
    #include <net/if_dl.h> 
    
    #define    min(a,b)    ((a) < (b) ? (a) : (b))  
    #define    max(a,b)    ((a) > (b) ? (a) : (b))  
    
    #define BUFFERSIZE    4000  
    
    char *if_names[MAXADDRS];  
    char *ip_names[MAXADDRS];  
    char *hw_addrs[MAXADDRS];  
    unsigned long ip_addrs[MAXADDRS];  
    
    static int   nextAddr = 0;  
    
    void InitAddresses();  
    void FreeAddresses();  
    void GetIPAddresses();  
    void GetHWAddresses();
    
    void InitAddresses()  {  
        int i;  
        for (i=0; i<MAXADDRS; ++i)  {  
            if_names[i] = ip_names[i] = hw_addrs[i] = NULL;  
            ip_addrs[i] = 0;  
        }  
    }  
    
    void FreeAddresses()  {  
        int i;  
        for (i=0; i<MAXADDRS; ++i)  {  
            if (if_names[i] != 0) free(if_names[i]);  
            if (ip_names[i] != 0) free(ip_names[i]);  
            if (hw_addrs[i] != 0) free(hw_addrs[i]);  
            ip_addrs[i] = 0;  
        }  
        InitAddresses();  
    }  
    
    void GetIPAddresses()  {  
        int                 i, len, flags;  
        char                buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;  
        struct ifconf       ifc;  
        struct ifreq        *ifr, ifrcopy;  
        struct sockaddr_in  *sin;  
        
        char temp[80];  
        
        int sockfd;  
        
        for (i=0; i<MAXADDRS; ++i)  {  
            if_names[i] = ip_names[i] = NULL;  
            ip_addrs[i] = 0;  
        }  
        
        sockfd = socket(AF_INET, SOCK_DGRAM, 0);  
        if (sockfd < 0)  {  
            perror("socket failed");  
            return;  
        }  
        
        ifc.ifc_len = BUFFERSIZE;  
        ifc.ifc_buf = buffer;  
        
        if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)  {  
            perror("ioctl error");  
            return;  
        }  
        
        lastname[0] = 0;  
        nextAddr = 0;
        for (ptr = buffer; ptr < buffer + ifc.ifc_len; )  {  
            ifr = (struct ifreq *)ptr;  
            len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);  
            ptr += sizeof(ifr->ifr_name) + len;    // for next one in buffer  
            
            if (ifr->ifr_addr.sa_family != AF_INET)  {  
                continue;    // ignore if not desired address family  
            }  
            
            if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL)  {  
                *cptr = 0;        // replace colon will null  
            }  
            
            if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)  {  
                continue;    /* already processed this interface */  
            }  
            
            memcpy(lastname, ifr->ifr_name, IFNAMSIZ);  
            
            ifrcopy = *ifr;  
            ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);  
            flags = ifrcopy.ifr_flags;  
            if ((flags & IFF_UP) == 0)  {  
                continue;    // ignore if interface not up  
            }  
            
            if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+1);  
            if (if_names[nextAddr] == NULL)  {  
                return;  
            }  
            strcpy(if_names[nextAddr], ifr->ifr_name);  
            
            sin = (struct sockaddr_in *)&ifr->ifr_addr;  
            strcpy(temp, inet_ntoa(sin->sin_addr));  
            
            ip_names[nextAddr] = (char *)malloc(strlen(temp)+1);  
            if (ip_names[nextAddr] == NULL)  {  
                return;  
            }  
            strcpy(ip_names[nextAddr], temp);  
            
            ip_addrs[nextAddr] = sin->sin_addr.s_addr;  
            
            ++nextAddr;  
        }  
        
        close(sockfd);  
    }  
    
    void GetHWAddresses()  {  
        struct ifconf ifc;  
        struct ifreq *ifr;  
        int i, sockfd;  
        char buffer[BUFFERSIZE], *cp, *cplim;  
        char temp[80];  
        
        for (i=0; i<MAXADDRS; ++i)  {  
            hw_addrs[i] = NULL;  
        }  
        
        sockfd = socket(AF_INET, SOCK_DGRAM, 0);  
        if (sockfd < 0)  {  
            perror("socket failed");  
            return;  
        }  
        
        ifc.ifc_len = BUFFERSIZE;  
        ifc.ifc_buf = buffer;  
        
        if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)  {  
            perror("ioctl error");  
            close(sockfd);  
            return;  
        }  
        
        ifr = ifc.ifc_req;  
        
        cplim = buffer + ifc.ifc_len;  
        
        for (cp=buffer; cp < cplim; )  {  
            ifr = (struct ifreq *)cp;  
            if (ifr->ifr_addr.sa_family == AF_LINK)  {  
                struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;  
                int a,b,c,d,e,f;  
                int i;  
                
                strcpy(temp, (char *)ether_ntoa((const struct ether_addr *)LLADDR(sdl)));  
                sscanf(temp, "%x:%x:%x:%x:%x:%x", &a, &b, &c, &d, &e, &f);  
                sprintf(temp, "%02X:%02X:%02X:%02X:%02X:%02X",a,b,c,d,e,f);  
                
                for (i=0; i<MAXADDRS; ++i)  {  
                    if ((if_names[i] != NULL) && (strcmp(ifr->ifr_name,if_names[i]) == 0))  {  
                        if (hw_addrs[i] == NULL)  {  
                            hw_addrs[i] = (char *)malloc(strlen(temp)+1);  
                            strcpy(hw_addrs[i], temp);  
                            break;  
                        }  
                    }  
                }  
            }  
            cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);  
        }  
        
        close(sockfd);  
    }  
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  • 原文地址:https://www.cnblogs.com/GameDeveloper/p/3449725.html
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