[PATCH v2 2/6] conf: Add --dhcp-boot command-line option

[Anshu Kumari <anskuma@redhat.com>]

Introduce the --dhcp-boot flag that sets the boot file URL for
network boot specially for ipxe. This patch adds the option
storage and CLI parsing.

Link: https://bugs.passt.top/show_bug.cgi?id=192
Signed-off-by: Anshu Kumari <anskuma@redhat.com>
---
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 | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/conf.c b/conf.c
index 89d2127..ae8ee26 100644
--- a/conf.c
+++ b/conf.c
@@ -618,6 +618,7 @@ 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 URL	Boot file URL for network boot\n"
 		"  --dhcp-opt CODE,VAL	Set DHCP option by code\n");
 	if (strstr(name, "pasta"))
 		FPRINTF(f, "    default: don't use any search list\n");
@@ -1239,6 +1240,7 @@ void conf(struct ctx *c, int argc, char **argv)
 		{"migrate-no-linger", no_argument,	NULL,		30 },
 		{"stats", required_argument,		NULL,		31 },
 		{"conf-path",	required_argument,	NULL,		'c' },
+		{"dhcp-boot", required_argument,	NULL,		32 },
 		{"dhcp-opt", required_argument,		NULL,		33 },
 		{ 0 },
 	};
@@ -1475,6 +1477,18 @@ void conf(struct ctx *c, int argc, char **argv)
 				die("Can't display statistics if not running in foreground");
 			c->stats = strtol(optarg, NULL, 0);
 			break;
+		case 32:
+			if (c->custom_opts_count >= MAX_CUSTOM_DHCP_OPTS)
+				die("Too many DHCP options (max %d)",
+				    MAX_CUSTOM_DHCP_OPTS);
+
+			c->custom_opts[c->custom_opts_count].code = 67;
+			if (snprintf_check(c->custom_opts[c->custom_opts_count].str,
+					   sizeof(c->custom_opts[0].str),
+					   "%s", optarg))
+				die("Boot file name too long: %s", optarg);
+			c->custom_opts_count++;
+			break;
 		case 33:
 			comma = strchr(optarg, ',');
 			if (!comma)
-- 
2.54.0