LinuxQuestions.org - [SOLVED] freebsd: SIOCSIFADDR returns EINVAL

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- - freebsd: SIOCSIFADDR returns EINVAL (https://www.linuxquestions.org/questions/%2Absd-17/freebsd-siocsifaddr-returns-einval-4175666955/)

freebsd: SIOCSIFADDR returns EINVAL

I am trying to set the IP address of an interface. The interface is virtual (vtnet0) if that matters.

The SIOCGIFADDR ioctl works, but I can't get the set to work. Here is the code fragment:

Code:

static int set_ip(const char *ifname, const char *ip, unsigned mask, int down)

{

        int s = socket(AF_INET, SOCK_DGRAM, 0);

        if (s == -1) {

                perror("set_ip socket");

                return -1;

        }



        struct ifreq req;

        memset(&req, 0, sizeof(req));



        strlcpy(req.ifr_name, ifname, IF_NAMESIZE);



        struct sockaddr_in *in = (struct sockaddr_in *)&req.ifr_addr;

#ifndef __linux__

        in->sin_len = sizeof(struct sockaddr_in);

#endif

        in->sin_family = AF_INET;

        if (ip)

                in->sin_addr.s_addr = inet_addr(ip);



        errno = 0;

        if (ioctl(s, SIOCSIFADDR, &req)) {

                perror("SIOCSIFADDR");

                goto failed;

        }

Is this not the correct way to set the IP on FreeBSD?

Refer to ifconfig(8).

You need a ifconfig_<interface> stanza in rc.conf(8) to bring up the interface on boot.

Ok, I solved it. You can't use SIOCSIFADDR, or SIOCIFNETMASK, you must use SIOCAIFADDR (note the A) which takes an ifaliasreq struct. You still use SIOCSIFFLAGS though.