嗨,我创建了一个函数,该函数接受一个可接受的sockFD作为输入,并将表示形式的ip地址输出到字符串。在我开始使用inet_ntop的调用包装字符串时,该函数似乎工作正常,该调用返回一个空指针,因此给了我错误。错误显示为设备上没有剩余空间,这是我不了解的,因为我有很多ram和rom。无论如何,以下是我正在使用的功能。
void getTheirIp(int s, char *ipstr){ // int s is the incoming socketFD, ipstr points the the calling
// functions pointer.
socklen_t len;
struct sockaddr_storage addr;
len = sizeof(addr); //I want to store my address in addr which is sockaddr_storage type
int stat;
stat = getpeername(s, (struct sockaddr*)&addr, &len); // This stores addrinfo in addr
printf("getTheirIP:the value of getpeername %d\n",stat);
// deal with both IPv4 and IPv6:
if ((stat=addr.ss_family) == AF_INET) { // I get the size of the sock first
printf("getTheirIP:the value of addr.ss_family is %d\n",stat);
ipstr = malloc(INET_ADDRSTRLEN); // I allocate memory to store the string
struct sockaddr_in *s = (struct sockaddr_in *)&addr; // I then create the struct sockaddr_in which
// is large enough to hold my address
if(NULL == inet_ntop(AF_INET, &s->sin_addr, ipstr, sizeof(ipstr))){ // I then use inet_ntop to
printf("getTheirIP:the value of inet_ntop is null\n");// retrieve the ip address and store
perror("The problem was"); // at location ipstr
}
} else { // AF_INET6 this is the same as the above except it deals with IPv6 length
ipstr = malloc(INET6_ADDRSTRLEN);
struct sockaddr_in6 *s = (struct sockaddr_in6 *)&addr;
inet_ntop(AF_INET6, &s->sin6_addr, ipstr, sizeof(ipstr));
}
printf("%s",ipstr);
}
我遗漏了该程序的其余部分,因为它太大而无法容纳,我只想专注于修复此部分。但是下面我将向您展示调用此函数的main()的一部分。
newSock = accept(listenSock,(struct sockaddr *)&their_addr,&addr_size);
char *someString;
getTheirIp(newSock,someString);
任何帮助将是巨大的。谢谢!
最佳答案
inet_ntop(AF_INET, &s->sin_addr, ipstr, sizeof(ipstr))
该
sizeof
是错误的,因为ipstr
是一个指针(它将产生该指针的大小,类似于4
或8
)。您需要传递ipstr
缓冲区的可用长度。