IO.SOCK.REUSE : SO_REUSEADDR の使用

JavaScript is not currently enabled, but is required for full CodeSonar manual search and browse functionality.

If you are viewing this file in your hub's Web GUI, enable JavaScript in your browser: you will also need it for GUI functionality.

If you opened this file directly from disk, your browser may be directly suppressing JavaScript functionality: certain browsers perform this suppression on local files (but not files delivered by web servers) for security reasons.

If you access the manual through the hub's Web GUI, the functionality will not be suppressed because the hub is a web server.
Alternatively, your browser may allow you to explicitly disable the security setting that suppresses functionality. See the CodeSonar FAQ for more information.

CodeSonar^® 9.2p0

CONFIDENTIAL

CodeSecure Inc

IO.SOCK.REUSE : SO_REUSEADDR の使用

要旨

SO_REUSEADDR ソケットオプションを使用した場合、同じポートで複数のバインドが起こり、結果としてサービスの盗難もしくは偽装が発生する可能性があります。

プロパティ

MisraC++2023

MisraC++2023:0.3.2

A function call shall not violate the function's preconditions

CWE

CWE:605

Multiple Binds to the Same Port

例

#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>

int reuseaddr_socket(char *hostname){
    int status;
    struct addrinfo *res;
    int socketfd;
    int optval=1;

    status = getaddrinfo(hostname,"80", NULL, &res);
    if (status)  return status ;

    socketfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
    freeaddrinfo(res);
    if (socketfd == -1)  return -1 ;

    status = setsockopt(socketfd,     /* 'Use of SO_REUSEADDR' warning issued here */
                        SOL_SOCKET,
                        SO_REUSEADDR,
                        &optval,
                        sizeof optval);
    if (status == -1) { close(socketfd); return -1; }

    /* ... remainder of function */
    close(socketfd);
    return 1;
}

ワーニングを引き起こす関数

CodeSonar ships with library models that allow it to functions such as libc setsockopt() that can enable SO_REUSEADDR. If one of these functions is called with arguments that enable SO_REUSEADDR, a warning will be issued.

If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Use of SO_REUSEADDR warnings.

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。