C/C++编程：acl网络编程封装

Myth丶恋晨 2022-11-16 04:53 135阅读 0赞

# gethostaddr #

封装.c

#include <stdlib.h>
    #include <stdio.h>
    #include <zconf.h>
    #include <netdb.h>
    #include <string.h>
    #include <zconf.h>
    #include <netdb.h>
    
    #define ERROR printf
    /**
     * 从字符串左边开始将包含给定分隔符在内的右边截断
     * @param string {char*} 源字符串
     * @param delimiter {int} 分隔符
     * @return {char*} 分隔符以右的字符串，当为NULL时表明未找到指定分隔符
     */
    char *acl_split_at(char *s, int delimiter){
        
        char   *cp;
    
        if ((cp = strchr(s, delimiter)) != 0){
        
            *cp++ = 0;
        }
    
        return cp;
    }
    /**
     * 从字符串右边开始将包含给定分隔符在内的右边截断
     * @param string {char*} 源字符串
     * @param delimiter {int} 分隔符
     * @return {char*} 分隔符以右的字符串，当为NULL时表明未找到指定分隔符
     */
    char *acl_split_at_right(char *s, int delimiter){
        
        char   *cp;
    
        if ((cp = strrchr(s, delimiter)) != 0)
            *cp++ = 0;
        return cp;
    }
    
    static int host_port(char *buf, char **host, char **port){
        
        char *cp = buf;
        cp = acl_split_at_right(buf, ':');
        *host =  buf ;
        *port = cp;
        return 0;
    }
    
    struct addrinfo *acl_host_addrinfo(const char *addr, int type)
    {
        
        int    err;
        struct addrinfo hints, *res0;
        char  *buf = strdup(addr);
        char *host = NULL, *port = NULL;
    
        if (host_port(buf, &host, &port) < 0) {
        
            free(buf);
            return NULL;
        }
    
        memset(&hints, 0, sizeof(hints));
        hints.ai_family   = PF_UNSPEC;  // (IPv4 and IPv6)
        hints.ai_socktype = type; // SOCK_STREAM
        hints.ai_flags    = AI_V4MAPPED | AI_ADDRCONFIG; // 只有当主机配置了IPv4地址才进行查询IPv4地址；只有当主机配置了IPv6地址才进行查询IPv6地址
        // 如果同时指定ai_family为AF_INT6时，如果没有可用的AAAA记录，就i返回A记录对应的IPv4映射的IPV6地址
        if ((err = getaddrinfo(host, port, &hints, &res0))) {
        
            ERROR("%s(%d): getaddrinfo error %s, host=%s, addr=%s",
                  __FILE__, __LINE__, gai_strerror(err), host, addr);
            free(buf);
            return NULL;
        }
    
        free(buf);
        return res0;
    }

引出.h

struct addrinfo *acl_host_addrinfo(const char *addr, int type)