IO.SOCK.REUSE : Use of SO

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CodeSonar^® 9.2p0

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CodeSecure Inc

IO.SOCK.REUSE : Use of SO_REUSEADDR

Summary

The code sets the SO_REUSEADDR socket option, which can lead to multiple binds to the same port and thence to stolen or spoofed services.

Properties

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

Example

#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;
}

Triggers

CodeSonar ships with library models that allow it to recognize 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.

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.