好的Linux TCP/IP监控工具不需要根访问?

我想调试我正在增强的程序的TCP/IP交互。我没有根访问权限(因此没有tcpdump等),但应用程序是以我自己的ID运行的。我可以使用strace来拦截系统调用,但是是否有值得推荐的替代方法?如果是,为什么-他们提供什么?命令行首选(目前我的电脑上没有安装X服务器:-(),但对GUI也很好奇。

理想情况下,它会说:

    app listening on port <portA>
    app listening on port <portB>
    client connection #1 accepted on listening port <portA> to local port <portC>
        from remote <hostX:portXA>
    app sent #1 <number> bytes "<data dump...>"
    app received from client #1 <number> bytes "<data dump...>"
    client #1 closed connection

我自己也会刮伤一个轮子,但太多的轮子无法重新改造……

事先谢谢。

更新:保卢贝尔和伊诺斯都提出了非常有益的建议…(希望我能接受这两个答案,因为它们都是明确的,而且同样好)。实现Paul建议的ld_预载拦截的代码如下:

// TCP comms trace library
//   as per http://www.jayconrod.com/cgi/view_post.py?23

#define _GNU_SOURCE

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <dlfcn.h>


typedef ssize_t (*Recv)(int s, void* buf, size_t len, int flags);

ssize_t recv(int s, void* buf, size_t len, int flags)
{
    static Recv real = NULL;

    if (!real)
        real = (Recv)dlsym(RTLD_NEXT, "recv");

    fprintf(stderr, "> recv(s '%d', buf %p, len %lld, flags %d)...\n",
            s, buf, len, flags);
    ssize_t result = real(s, buf, len, flags);
    fprintf(stderr, "< recv(s '%d', buf %p, len %lld, flags %d) return %lld\n",
            s, buf, len, flags, result);

    return result;
}

typedef ssize_t (*Send)(int s, const void* buf, size_t len, int flags);

ssize_t send(int s, const void* buf, size_t len, int flags)
{
    static Send real = NULL;

    if (!real)
        real = (Send)dlsym(RTLD_NEXT, "send");

    fprintf(stderr, "> send(s '%d', buf %p, len %lld, flags %d)...\n",
            s, buf, len, flags);
    ssize_t result = real(s, buf, len, flags);
    fprintf(stderr, "< recv(s '%d', buf %p, len %lld, flags %d) return %lld\n",
            s, buf, len, flags, result);

    return result;
}

typedef int (*Connect)(int s, const struct sockaddr* serv_addr, socklen_t addrlen);

int connect(int s, const struct sockaddr* serv_addr, socklen_t addrlen)
{
    static Connect real = NULL;

    if (!real)
        real = (Connect)dlsym(RTLD_NEXT, "connect");

    fprintf(stderr, "> connect(s %d, sockaddr %p, addrlen %d)\n",
            s, (void*)serv_addr, addrlen);
    int result = real(s, serv_addr, addrlen);
    fprintf(stderr, "< connect(s %d, sockaddr %p, addrlen %d) return %d\n",
            s, (void*)serv_addr, addrlen, result);

    return result;
}

typedef int (*Accept)(int s, const struct sockaddr* serv_addr, socklen_t* addrlen);

int accept(int s, struct sockaddr* serv_addr, socklen_t* addrlen)
{
    static Accept real = NULL;

    if (!real)
        real = (Accept)dlsym(RTLD_NEXT, "accept");

    fprintf(stderr, "> accept(s %d, sockaddr %p, addrlen %p)\n",
            s, (void*)serv_addr, addrlen);
    int result = real(s, serv_addr, addrlen);
    fprintf(stderr, "< accept(s %d, sockaddr %p, addrlen %p -> %d) return %d\n",
            s, (void*)serv_addr, addrlen, *addrlen, result);

    return result;
}