On Fri, Jul 17, 2026 at 11:26:42PM +0530, Anshu Kumari wrote:
Add a convenience shorthand --dhcp-boot FILE that sets the boot file name (DHCP option 67) for network boot. This is equivalent to --dhcp-opt 67,FILE.
Link: https://bugs.passt.top/show_bug.cgi?id=192 Signed-off-by: Anshu Kumari
Reviewed-by: David Gibson
--- v5: - replaced conf_dhcp_option() to dhcp_set_opt().
v4: - Changed argument name from URL to FILE in usage and man page. - Fixed UEFI HTTP boot wording in man page
v3: - case 32 now calls dhcp_add_option(c, 67, optarg). - Handles duplicate codes: --dhcp-boot and --dhcp-opt 67 coexist correctly, last value wins.
v2: - Removed separate dhcp_boot[PATH_MAX] field — --dhcp-boot foo now stores into custom_opts[] as code 67 (same as --dhcp-opt 67,foo)
--- conf.c | 5 +++++ passt.1 | 7 +++++++ 2 files changed, 12 insertions(+)
diff --git a/conf.c b/conf.c index e7f3ea0..eccf1c0 100644 --- a/conf.c +++ b/conf.c @@ -617,6 +617,7 @@ static void usage(const char *name, FILE *f, int status) " a single, empty option disables the DNS search list\n" " -H, --hostname NAME Hostname to configure client with\n" " --fqdn NAME FQDN to configure client with\n" + " --dhcp-boot FILE Boot file name for network boot\n" " --dhcp-opt CODE,VAL Set DHCP option CODE to VAL\n"); if (strstr(name, "pasta")) FPRINTF(f, " default: don't use any search list\n"); @@ -1321,6 +1322,7 @@ void conf(struct ctx *c, int argc, char **argv) {"stats", required_argument, NULL, 31 }, {"conf-path", required_argument, NULL, 'c' }, {"chroot-fallback", no_argument, NULL, 32 }, + {"dhcp-boot", required_argument, NULL, 33 }, {"dhcp-opt", required_argument, NULL, 34 }, { 0 }, }; @@ -1566,6 +1568,9 @@ void conf(struct ctx *c, int argc, char **argv) case 32: c->chroot_fallback = true; break; + case 33: + dhcp_set_opt(67, optarg); + break; case 34: comma = strchr(optarg, ','); if (!comma) diff --git a/passt.1 b/passt.1 index 215a289..bfc2111 100644 --- a/passt.1 +++ b/passt.1 @@ -440,6 +440,13 @@ Send \fIname\fR as DHCP option 12 (hostname). FQDN to configure the client with. Send \fIname\fR as Client FQDN: DHCP option 81 and DHCPv6 option 39.
+.TP +.BR \-\-dhcp-boot " " \fIfile +Convenience shorthand for \fB\-\-dhcp-opt\fR 67,\fIfile\fR. +Sets the boot file name (DHCP option 67) for network boot. +For UEFI HTTP boot, the vendor class identifier also needs to be set using +\fB\-\-dhcp-opt\fR 60,HTTPClient. + .TP .BR \-\-dhcp-opt " " \fICODE\fR,\fIVALUE\fR Set DHCP option \fICODE\fR (1\-254) to \fIVALUE\fR. The value format depends -- 2.54.0
-- David Gibson (he or they) | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you, not the other way | around. http://www.ozlabs.org/~dgibson