On Fri, 18 Oct 2019 07:24:12 -0700 Cy Schubert <cy.schub...@cschubert.com> wrote:
> In message <20191018160935.7dda6...@hermann.fritz.box>, "Hartmann, > O." writes: > > --Sig_/QDD9BZgeMM6.TJkOIciNb32 > > Content-Type: text/plain; charset=US-ASCII > > Content-Transfer-Encoding: quoted-printable > > > > On Fri, 18 Oct 2019 14:00:45 +0200 > > Gary Jennejohn <gljennj...@gmail.com> wrote: > > > > > On Fri, 18 Oct 2019 12:21:04 +0200 > > > "Hartmann, O." <ohartm...@walstatt.org> wrote: > > >=20 > > > > On Thu, 17 Oct 2019 21:33:01 +0000 (UTC) > > > > Conrad Meyer <c...@freebsd.org> wrote: > > > > =20 > > > > > Author: cem > > > > > Date: Thu Oct 17 21:33:01 2019 > > > > > New Revision: 353700 > > > > > URL: https://svnweb.freebsd.org/changeset/base/353700 > > > > >=20 > > > > > Log: > > > > > Implement NetGDB(4) > > > > > =20 > > > > > NetGDB(4) is a component of a system using a panic-time > > > > > network stack to remotely debug crashed FreeBSD kernels over > > > > > the network, instead of traditional serial interfaces. > > > > > =20 > > > > > There are three pieces in the complete NetGDB system. > > > > > =20 > > > > > First, a dedicated proxy server must be running to accept > > > > > connections from both NetGDB and gdb(1), and pass > > > > > bidirectional traffic between the two protocols. > > > > > =20 > > > > > Second, the NetGDB client is activated much like ordinary > > > > > 'gdb' and similarly to 'netdump' in ddb(4) after a panic. > > > > > Like other debugnet(4) clients (netdump(4)), the network > > > > > interface on the route to the proxy server must be online and > > > > > support debugnet(4). =20 > > > > > Finally, the remote (k)gdb(1) uses 'target remote > > > > > <proxy>:<port>' (like any other TCP remote) to connect to the > > > > > proxy server.=20 > > > > > The NetGDB v1 protocol speaks the literal GDB remote serial > > > > > protocol, and uses a 1:1 relationship between GDB packets and > > > > > sequences of debugnet packets (fragmented by MTU). There is > > > > > no encryption utilized to keep debugging sessions private, so > > > > > this is only appropriate for local segments or trusted > > > > > networks. =20 > > > > > Submitted by: John Reimer <john.reimer AT emc.com> > > > > > (earlier version) Discussed some with: emaste, markj > > > > > Relnotes: sure > > > > > Differential Revision: > > > > > https://reviews.freebsd.org/D21568 > > > > >=20 > > > > > Added: > > > > > head/share/man/man4/netgdb.4 (contents, props changed) > > > > > head/sys/gdb/netgdb.c (contents, props changed) > > > > > head/sys/gdb/netgdb.h (contents, props changed) > > > > > Modified: > > > > > head/share/man/man4/Makefile > > > > > head/share/man/man4/ddb.4 > > > > > head/sys/amd64/conf/GENERIC > > > > > head/sys/conf/NOTES > > > > > head/sys/conf/files > > > > > head/sys/conf/options > > > > > head/sys/gdb/gdb.h > > > > > head/sys/gdb/gdb_int.h > > > > > head/sys/gdb/gdb_main.c > > > > > head/sys/gdb/gdb_packet.c > > > > > head/sys/i386/conf/GENERIC > > > > > head/sys/kern/subr_kdb.c > > > > > head/sys/net/debugnet.c > > > > > head/sys/net/debugnet.h > > > > > head/sys/net/debugnet_inet.c > > > > > head/sys/net/debugnet_int.h > > > > > head/sys/sys/kdb.h > > > > > head/sys/sys/param.h > > > > >=20 > > > > > Modified: head/share/man/man4/Makefile > > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > > > > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > > =3D=3D=3D=3D=3D > > > > > --- head/share/man/man4/Makefile Thu Oct 17 21:25:50 > > > > > 2019 (r353699) +++ head/share/man/man4/Makefile > > > > > Thu Oct 17 21:33:01 2019 (r353700) @@ -307,6 +307,7 @@ > > > > > MAN=3D aac.4 \ net80211.4 \ > > > > > netdump.4 \ > > > > > netfpga10g_nf10bmac.4 \ > > > > > + netgdb.4 \ > > > > > netgraph.4 \ > > > > > netintro.4 \ > > > > > netmap.4 \ > > > > > =20 > > > > [...] > > > >=20 > > > >=20 > > > > Having "nooptions NETGDB # netgdb(4) client > > > > support" defined in my kernel config file, buildkernel fails > > > > with the error shown below. > > > >=20 > > > > [...] > > > > --- debugnet.o --- > > > > /usr/src/sys/net/debugnet.c:662:4: error: implicit declaration > > > > of function 'db_printf' is invalid in C99 > > > > [-Werror,-Wimplicit-function-declaration] db_printf("%s: Could > > > > not get route for that server.\n", ^ > > > > /usr/src/sys/net/debugnet.c:662:4: note: did you mean > > > > 'if_printf'? /usr/src/sys/net/if_var.h:679:5: note: 'if_printf' > > > > declared here int if_printf(struct ifnet *, const char *, > > > > ...) __printflike(2, 3); ^ 1 error generated. =20 > > >=20 > > > And I also had to add "nooptions NETDUMP" to get the kernel to > > > compile and link. > > >=20 > > > > I already had "nooptions NETDUMP" defined. > > > This will fix it. > > Index: sys/net/debugnet.c > =================================================================== > --- sys/net/debugnet.c (revision 353717) > +++ sys/net/debugnet.c (working copy) > @@ -659,8 +659,10 @@ > CURVNET_RESTORE(); > > if (dest_rt == NULL) { > +#ifdef DDB > db_printf("%s: Could not get route for that > server.\n", __func__); > +#endif > error = ENOENT; > goto cleanup; > } > > > Doesn't work, either. The kernel config in question doesn't have any debugging features enabled, so nooptions DDB is alos part of the configuration. buildkernel still fails.
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