On Thu, 17 Oct 2019 21:33:01 +0000 (UTC) Conrad Meyer <c...@freebsd.org> wrote:
> Author: cem > Date: Thu Oct 17 21:33:01 2019 > New Revision: 353700 > URL: https://svnweb.freebsd.org/changeset/base/353700 > > Log: > Implement NetGDB(4) > > 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. > > There are three pieces in the complete NetGDB system. > > 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. > > 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). > > Finally, the remote (k)gdb(1) uses 'target remote <proxy>:<port>' > (like any other TCP remote) to connect to the proxy server. > > 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. > > 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 > > 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 > > Modified: head/share/man/man4/Makefile > ============================================================================== > --- 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= > aac.4 \ net80211.4 \ > netdump.4 \ > netfpga10g_nf10bmac.4 \ > + netgdb.4 \ > netgraph.4 \ > netintro.4 \ > netmap.4 \ > [...] Having "nooptions NETGDB # netgdb(4) client support" defined in my kernel config file, buildkernel fails with the error shown below. [...] --- 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.
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