[PATCH 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>
---
 conf.c  | 9 +++++++++
 passt.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/conf.c b/conf.c
index 2624e58..61a393f 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");
@@ -846,6 +847,8 @@ static void conf_print(const struct ctx *c)
 			info("    router: %s",
 			     inet_ntop(AF_INET, &c->ip4.guest_gw,
 				       buf, sizeof(buf)));
+			if (c->dhcp_boot[0])
+				info("    boot file: %s", c->dhcp_boot);
 			for (i = 0; i < c->custom_opts_count; i++)
 				info("    option %u: %s",
 				     c->custom_opts[i].code,
@@ -1239,6 +1242,7 @@ 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 },
 	};
@@ -1472,6 +1476,11 @@ 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 (snprintf_check(c->dhcp_boot, sizeof(c->dhcp_boot),
+					   "%s", optarg))
+				die("Boot file name too long: %s", optarg);
+			break;
 		case 33: {
 			unsigned long code;
 			const char *comma;
diff --git a/passt.h b/passt.h
index acb57dd..2354a0f 100644
--- a/passt.h
+++ b/passt.h
@@ -262,6 +262,7 @@ struct ctx {
 
 	char hostname[PASST_MAXDNAME];
 	char fqdn[PASST_MAXDNAME];
+	char dhcp_boot[PATH_MAX];
 
 #define MAX_CUSTOM_DHCP_OPTS	32
 
-- 
2.54.0