在 Ubuntu 上使用 TCP_REPAIR 套接字选项编译代码 [关闭]

Question

按照这篇文章，我正在尝试编译一个使用 TPC_REPAIR 的 C 程序。

http://oroboro.com/dealing-with-network-port-abuse-in-sockets-in-c/

TCP_REPAIR 定义在

/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h

包含此标头与其他套接字 API 所需的标头冲突。

这是我的代码

#include <stdio.h>
#include <unistd.h>
#include <linux/socket.h>
#include <uapi/linux/in.h>
#include <netinet/tcp.h>
#include "/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h"
int main(int argc, char* argv[])
{
    int cfd;
    struct sockaddr_in addr;
    char ch='r';
    cfd=socket(AF_INET, SOCK_STREAM, 0);
    addr.sin_family=AF_INET;
    addr.sin_addr.s_addr=inet_addr("10.160.102.40");
    addr.sin_port=htons(9988);
    if(connect(cfd, (struct sockaddr *)&addr,
    sizeof(addr))<0) {
        perror("connect error");
        return -1;
    }
    if(write(cfd, &ch, 1)<0) perror("write");
    if(read(cfd, &ch, 1)<0) perror("read");
    printf("\nReply from Server: %c\n",ch);
    //close(cfd);

    int aux = 1;
    if(setsockopt(cfd, SOL_TCP, TCP_REPAIR, &aux, sizeof( aux )) < 0 )
    {
        perror( "could not turn on repair mode" );
    }
   return 0;
}

这里是 gcc 输出

In file included from /usr/include/netinet/tcp.h:56:0,
                 from new_client.c:5:
/usr/include/x86_64-linux-gnu/sys/types.h:45:18: error: conflicting types for ‘loff_t’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:45:26: note: previous declaration of ‘loff_t’ was here
/usr/include/x86_64-linux-gnu/sys/types.h:61:17: error: conflicting types for ‘dev_t’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:15:25: note: previous declaration of ‘dev_t’ was here
/usr/include/x86_64-linux-gnu/sys/types.h:76:19: error: conflicting types for ‘nlink_t’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:19:17: note: previous declaration of ‘nlink_t’ was here
In file included from /usr/include/x86_64-linux-gnu/sys/types.h:133:0,
                 from /usr/include/netinet/tcp.h:56,
                 from new_client.c:5:
/usr/include/time.h:104:19: error: conflicting types for ‘timer_t’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:25:26: note: previous declaration of ‘timer_t’ was here
In file included from /usr/include/netinet/tcp.h:56:0,
                 from new_client.c:5:
/usr/include/x86_64-linux-gnu/sys/types.h:198:1: error: conflicting types for ‘int64_t’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:113:17: note: previous declaration of ‘int64_t’ was here
/usr/include/x86_64-linux-gnu/sys/types.h:204:1: error: conflicting types for ‘u_int64_t’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:112:17: note: previous declaration of ‘u_int64_t’ was here
In file included from /usr/include/x86_64-linux-gnu/sys/types.h:220:0,
                 from /usr/include/netinet/tcp.h:56,
                 from new_client.c:5:
/usr/include/x86_64-linux-gnu/sys/select.h:76:5: error: conflicting types for ‘fd_set’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:14:26: note: previous declaration of ‘fd_set’ was here
In file included from /usr/include/netinet/tcp.h:56:0,
                 from new_client.c:5:
/usr/include/x86_64-linux-gnu/sys/types.h:236:20: error: conflicting types for ‘blkcnt_t’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/types.h:134:23: note: previous declaration of ‘blkcnt_t’ was here
In file included from /usr/include/x86_64-linux-gnu/sys/uio.h:29:0,
                 from /usr/include/x86_64-linux-gnu/sys/socket.h:28,
                 from /usr/include/netinet/tcp.h:57,
                 from new_client.c:5:
/usr/include/x86_64-linux-gnu/bits/uio.h:44:8: error: redefinition of ‘struct iovec’
/usr/src/linux-headers-3.8.0-29-generic/include/uapi/linux/uio.h:16:8: note: originally defined here
In file included from /usr/include/x86_64-linux-gnu/sys/socket.h:40:0,
                 from /usr/include/netinet/tcp.h:57,
                 from new_client.c:5:
/usr/include/x86_64-linux-gnu/bits/socket.h:180:8: error: redefinition of ‘struct sockaddr’
/usr/src/linux-headers-3.8.0-29-generic/include/uapi/linux/socket.h:19:27: note: originally defined here
/usr/include/x86_64-linux-gnu/bits/socket.h:193:8: error: redefinition of ‘struct __kernel_sockaddr_storage’
/usr/src/linux-headers-3.8.0-29-generic/include/uapi/linux/socket.h:13:8: note: originally defined here
/usr/include/x86_64-linux-gnu/bits/socket.h:204:5: error: expected identifier before numeric constant
/usr/include/x86_64-linux-gnu/bits/socket.h:253:8: error: redefinition of ‘struct msghdr’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/socket.h:47:8: note: originally defined here
/usr/include/x86_64-linux-gnu/bits/socket.h:280:8: error: redefinition of ‘struct cmsghdr’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/socket.h:69:8: note: originally defined here
/usr/include/x86_64-linux-gnu/bits/socket.h:310:24: error: conflicting types for ‘__cmsg_nxthdr’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/socket.h:111:32: note: previous definition of ‘__cmsg_nxthdr’ was here
/usr/include/x86_64-linux-gnu/bits/socket.h:339:5: error: expected identifier before numeric constant
In file included from /usr/include/x86_64-linux-gnu/sys/socket.h:40:0,
                 from /usr/include/netinet/tcp.h:57,
                 from new_client.c:5:
/usr/include/x86_64-linux-gnu/bits/socket.h:417:8: error: redefinition of ‘struct linger’
/usr/src/linux-headers-3.8.0-29-generic/include/linux/socket.h:34:8: note: originally defined here
In file included from new_client.c:6:0:
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:24:8: error: redefinition of ‘struct tcphdr’
/usr/include/netinet/tcp.h:92:8: note: originally defined here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:135:6: error: nested redefinition of ‘enum tcp_ca_state’
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:135:6: error: redeclaration of ‘enum tcp_ca_state’
/usr/include/netinet/tcp.h:179:6: note: originally defined here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:136:2: error: redeclaration of enumerator ‘TCP_CA_Open’
/usr/include/netinet/tcp.h:181:3: note: previous definition of ‘TCP_CA_Open’ was here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:138:2: error: redeclaration of enumerator ‘TCP_CA_Disorder’
/usr/include/netinet/tcp.h:182:3: note: previous definition of ‘TCP_CA_Disorder’ was here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:140:2: error: redeclaration of enumerator ‘TCP_CA_CWR’
/usr/include/netinet/tcp.h:183:3: note: previous definition of ‘TCP_CA_CWR’ was here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:142:2: error: redeclaration of enumerator ‘TCP_CA_Recovery’
/usr/include/netinet/tcp.h:184:3: note: previous definition of ‘TCP_CA_Recovery’ was here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:144:2: error: redeclaration of enumerator ‘TCP_CA_Loss’
/usr/include/netinet/tcp.h:185:3: note: previous definition of ‘TCP_CA_Loss’ was here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:148:8: error: redefinition of ‘struct tcp_info’
/usr/include/netinet/tcp.h:188:8: note: originally defined here
/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h:193:8: error: redefinition of ‘struct tcp_md5sig’
/usr/include/netinet/tcp.h:235:8: note: originally defined here

Answer 1

这个真的没用

#include "/usr/src/linux-headers-3.8.0-29/include/uapi/linux/tcp.h"

因为内核要么支持，要么不支持。你可以这样检查：

find /usr/include -type f -exec grep TCP_REPAIR {} /dev/null \;
/usr/include/linux/tcp.h:#define TCP_REPAIR     19  /* TCP sock is under repair right now */
/usr/include/linux/tcp.h:#define TCP_REPAIR_QUEUE   20
/usr/include/linux/tcp.h:#define TCP_REPAIR_OPTIONS 22

如果它在那里，那就太好了，否则你将不得不使用解决方法。

这是一个拥有它的 Ubuntu

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.10
Release:        12.10
Codename:       quantal

SOL_TCP 好像只定义在 /usr/include/netinet/tcp.h 中

find /usr/include -type f -exec grep SOL_TCP {} /dev/null \;
/usr/include/netinet/tcp.h:# define SOL_TCP     6   /* TCP level */

为了克服 /usr/include/linux/tcp.h 中 SOL_TCP 的不幸缺失。你可以尝试简单地从netinet/tcp.h复制它，毕竟它只是一个数字。

#ifndef SOL_TCP
#define SOL_TCP 6
#endif

但是，setsockopt 的手册页提供了一种更好的方法：

要在任何其他级别操作选项，提供控制选项的适当协议的协议号。例如，表示一个选项由 TCP 协议解释，level 应该设置为 TCP 的协议号；参见 getprotoent(3)。