网络编程 UDP 改变网关和网卡名字
在程序里动态改变网关和网卡名字
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1,改变网卡名字
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#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <netinet/in.h> #include <net/if.h> int main(){ int fd; ifreq ifr; fd = socket(AF_INET, SOCK_DGRAM, 0); strncpy(ifr.ifr_name, "lo", IFNAMSIZ - 1); strncpy(ifr.ifr_newname, "newloname", IFNAMSIZ - 1); if(ioctl(fd, SIOCSIFNAME, &ifr) != 0){ perror("ioctl"); return 1; } close(fd); return 0; }
github源代码c++
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2,改变网关
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#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <netinet/in.h> #include <net/if.h> #include <arpa/inet.h> int main(){ int fd; ifreq ifr; sockaddr_in *s_in; fd = socket(AF_INET, SOCK_DGRAM, 0); s_in = (sockaddr_in*)&ifr.ifr_addr; s_in->sin_family = AF_INET; inet_pton(AF_INET, "255.0.0.0", &s_in->sin_addr); strncpy(ifr.ifr_name, "enp0s3", IFNAMSIZ - 1); if(ioctl(fd, SIOCSIFNETMASK, &ifr) != 0){ perror("ioctl"); return 1; } close(fd); return 0; }
github源代码git
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