79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int _valid_ipv4_port(const char *str, int port)
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{
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int ret;
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int fd;
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int i;
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volatile int local_errno;
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struct sockaddr_in addr;
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fd = socket(AF_INET,SOCK_STREAM,0); //初始化socket
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if(fd ==-1) //检查是否正常初始化socket
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{
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return -1;
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}
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errno = 0;
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local_errno = errno;
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ret = inet_pton(AF_INET, str ,&addr.sin_addr);
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printf("the value of ret is:%d\n",ret);
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if(ret > 0)
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{
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fprintf(stderr, "\"%s\" is a vaild IPv4 address\n", str);
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addr.sin_family = AF_INET; //地址结构的协议簇
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addr.sin_port=htons(port); //地址结构的端口地址，网络字节序
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printf("the value of str:%s\n", str);
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i = (bind(fd, (struct sockaddr*)&addr, sizeof(struct sockaddr)));
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printf("the value of i:%d\n", i);
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if( i < 0)
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{
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printf("port %d has been used. \n", port);
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close(fd);
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return -1;
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}
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printf("port %d is ok. \n", port);
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close(fd);
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return 0;
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}
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else if (ret < 0)
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{
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fprintf(stderr, "EAFNOSUPPORT: %s\n", strerror(local_errno));
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return -1;
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}
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else
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{
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fprintf(stderr, "\"%s\" is not a vaild IPv4 address\n", str);
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return -1;
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}
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}
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int main()
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{
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char a[] ="192.168.209.193";
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char *pIP = a;
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char *pNotIP = "192.168.0.256";
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int port = 56298;
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int port1 = 3369;
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_valid_ipv4_port(pIP, port);
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_valid_ipv4_port(pIP, port1);
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_valid_ipv4_port(pNotIP, port1);
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return 0;
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}
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