Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.bugs.dist > #1251732

Bug#1069897: Netcfg to get search domain

Cross-posted to 2 groups.

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

Right so I was wrong, netcfg reads the domain from here: /tmp/domain_name
which is filled by udhcpc default.script
The patch above won't work alone as we would need udhcpc to write the
search domain to a file and make a read function in netcfg to get the info
(or something along those lines)

Here is an updated version of the hack:
d-i preseed/early_command string \
        sed -i 's|printf "\$domain" > /tmp/domain_name|printf "$search" >
/tmp/domain_name|' /etc/udhcpc/default.script; \
        mv /sbin/udhcpc /sbin/udhcpc.real; \
        echo '#!/bin/sh' > /sbin/udhcpc; \
        echo 'exec /bin/busybox udhcpc -O search "$@"' >> /sbin/udhcpc; \
        chmod +x /sbin/udhcpc

On Thu, Jul 3, 2025 at 12:30 PM Frédéric Guyot <guyot.frederic26@gmail.com>
wrote:

> Here is an updated patch for this issue:
>
> --- dhcp.c
> +++ dhcp.c
> @@ -41,6 +41,7 @@
>                                                    "domain",
>                                                    "hostname",
>                                                    "dns",
> +                                                  "search",
>                                                    "ntpsrv", /* extra */
>                                                    NULL };
>
> @@ -510,7 +511,7 @@
>               * nameservers now so we can do rDNS lookups later to possibly
>               * find out the domain.
>               */
> -            netcfg_write_resolv(NULL, interface);
> +            netcfg_write_resolv(NULL, NULL, interface);
>              state = HOSTNAME;
>              break;
>
> @@ -613,7 +614,7 @@
>                  netcfg_write_common("", hostname, domain);
>                  netcfg_write_loopback();
>                  netcfg_write_interface(interface);
> -                netcfg_write_resolv(domain, interface);
> +                netcfg_write_resolv(domain, search, interface);
>  #if !defined(__FreeBSD_kernel__)
>                  kill_dhcp_client();
>  #endif
>
> --- static.c
> +++ static.c
> @@ -258,14 +258,16 @@
>      return 1;
>  }
>
> -int netcfg_write_resolv (const char *domain, const struct netcfg_interface *interface)
> +int netcfg_write_resolv (const char *domain , const char *search, const struct netcfg_interface *interface)
>  {
>      FILE* fp = NULL;
>
>      if ((fp = file_open(RESOLV_FILE, "w"))) {
>          unsigned int i = 0;
> +        if (search && !empty_str(search))
> +            fprintf(fp, "search %s\n", search);
>          if (domain && !empty_str(domain))
> -            fprintf(fp, "search %s\n", domain);
> +            fprintf(fp, "domain %s\n", domain);
>
>          for (i = 0; i < NETCFG_NAMESERVERS_MAX; i++)
>              if (!empty_str(interface->nameservers[i]))
>
> This should do the trick.
>
> If someone comes across this issue and this patch hasn't been merged we found an ugly workaround using a preseed file:
>
> d-i preseed/early_command string \
>         sed -i '/^case /i domain="$search"' /etc/udhcpc/default.script; \
>         mv /sbin/udhcpc /sbin/udhcpc.real; \
>         echo '#!/bin/sh' > /sbin/udhcpc; \
>         echo 'exec /bin/busybox udhcpc -O search "$@"' >> /sbin/udhcpc; \
>         chmod +x /sbin/udhcpc
>
> It will make a wrapper for udhcpc that will force netcfg to query search domains, patch the default.script callback script from udhcpc to make domain="$seach".
>
> regards
>
>
>

Back to linux.debian.bugs.dist | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Bug#1069897: Netcfg to get search domain Frédéric Guyot <guyot.frederic26@gmail.com> - 2025-07-03 12:40 +0200
  Bug#1069897: Netcfg to get search domain Frédéric Guyot <guyot.frederic26@gmail.com> - 2025-07-03 14:20 +0200

csiph-web