[英]dereferencing pointer to incomplete type with struct ip and also with struct iphdr
hello i'm trying to parse some packets, and when using struct ip i get the: "dereferencing pointer to incomplete type" error message. 你好,我正在尝试解析一些数据包,并且当使用struct ip时,我得到了:“将指针指向不完整类型”错误消息。 So i tryed then with struct iphdr but still have the same problem Here is the function i'm using for parsing the packet:
因此,我尝试使用struct iphdr进行操作,但仍然遇到相同的问题,这是我用来解析数据包的函数:
PrintPacketInHex(char *mesg, unsigned char *p, int len){
printf(mesg);
while(len--){
printf("%.2X ",*p);
p++;
}
}
/*parse the sniffed packets*/
ParseEthernetHeader(unsigned char *packet, int len){
struct ethhdr *ethernet_header;
struct ip *ip_header;
//+sizeof(struct iphdr)
if(len> sizeof(struct ethhdr)){
ethernet_header = (struct ethhdr*) packet;
packet = packet +16;
ip_header = (struct ip*) packet;
/* first set of 6 bytes are destination MAC*/
PrintPacketInHex("destination MAC : ", ethernet_header->h_dest,6);
printf("\n");
/*scond set of 6 bytes are source MAC */
PrintPacketInHex("source MAC : ", ethernet_header->h_source,6);
printf("\n");
/*last 2 bytes in ethernet header are the protocol in carries */
PrintPacketInHex("protocol: ", (void*)ðernet_header->h_proto,2);
printf("\n");
/*the next 4 bytes are ip version bytes */
PrintPacketInHex("ip version: ", ip_header->ip_v,4);
printf("\n");
/*the next 4 bytes are internet header length */
PrintPacketInHex("internet header length: ", ip_header->ip_ihl,4);
printf("\n");
/*the next 8 bytes are type of srvice bytes */
PrintPacketInHex("type of service: ", ip_header->ip_tos,8);
printf("\n");
/*the next 8 bytes are total length bytes */
PrintPacketInHex("total length: ", ip_header->ip_len,16);
printf("\n");
/*the next 8 bytes are identification bytes */
PrintPacketInHex("identification: ", ip_header->ip_id,16);
printf("\n");
/*the next 8 bytes are flags bytes
PrintPacketInHex("Flags: ", "flags",3);
printf("\n");*/
/*the next 13 bytes flags and offset bytes */
PrintPacketInHex("offset: ", ip_header->ip_off,16);
printf("\n");
/*the next 8 bytes time to live bytes */
PrintPacketInHex("time to live: ", ip_header->ip_ttl,8);
printf("\n");
/*the next 8 bytes protocol bytes */
PrintPacketInHex("protocol: ", ip_header->ip_p,8);
printf("\n");
/*the next 16 bytes are checksum bytes */
PrintPacketInHex("checksum: ", ip_header->ip_sum,16);
printf("\n");
/*the next 32 bytes source ip adress bytes */
PrintPacketInHex("source ip: ", ip_header->ip_src,32);
printf("\n");
/*the next 32 bytes destination ip adress bytes */
PrintPacketInHex("destination ip: ", ip_header->dip_dst,32);
printf("\n");
}
else printf("packet size too small ! \n");
}
i know that there are other errors in the program but want to solve this problem before looking for other problems. 我知道程序中还有其他错误,但想在寻找其他问题之前先解决此问题。 thank you
谢谢
您的编译单元必须包括struct ethhdr
和struct ip
的定义,以便您能够访问它们的成员。
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