CODEWITHSUNDEEP
tcpnetwork-programmingip
Sandeep
Sandeep

Reputation: 13

unable to read tcp/ip headers

i am getting this error:‘struct iphdr’ has no member named ‘ip_ttl’ same for other members too but not for protocol feild what is the solution to it?and y does it happen? PS:I saw this on various forums but couldn't get why is it able to access ipHeader->protocol and not others

Upvotes: 1

Views: 237

Answers (1)

Jeff
Jeff

Reputation: 1867

Assuming you're using Linux, try taking a look at /usr/include/linux/ip.h. That header file defines the structure:

struct iphdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
    __u8    ihl:4,
        version:4;
#elif defined (__BIG_ENDIAN_BITFIELD)
    __u8    version:4,
        ihl:4;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
    __u8    tos;
    __be16  tot_len;
    __be16  id;
    __be16  frag_off;
    __u8    ttl;
    __u8    protocol;
    __sum16 check;
    __be32  saddr;
    __be32  daddr;
    /*The options start here. */
};

As you can see, the name of the field is ttl, not ip_ttl.

Upvotes: 1

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