1 files changed, 111 insertions, 0 deletions
diff --git a/usr/kinit/nfsroot.c b/usr/kinit/nfsroot.c
new file mode 100644
index 0000000..3b80773
--- /dev/null
+++ b/usr/kinit/nfsroot.c
@@ -0,0 +1,111 @@
+#include <arpa/inet.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "kinit.h"
+#include "netdev.h"
+#include "nfsmount.h"
+
+static char *sub_client(__u32 client, char *path, size_t len)
+{
+	struct in_addr addr = { client };
+	char buf[len];
+
+	if (strstr(path, "%s") != NULL) {
+		if (client == INADDR_NONE) {
+			fprintf(stderr, "Root-NFS: no client address\n");
+			exit(1);
+		}
+
+		snprintf(buf, len, path, inet_ntoa(addr));
+		strcpy(path, buf);
+	}
+
+	return path;
+}
+
+#define NFS_ARGC 6
+#define MOUNT_POINT "/root"
+
+int mount_nfs_root(int argc, char *argv[], int flags)
+{
+	(void)flags;		/* FIXME - don't ignore this */
+
+	struct in_addr addr = { INADDR_NONE };
+	__u32 client = INADDR_NONE;
+	const int len = 1024;
+	struct netdev *dev;
+	char *mtpt = MOUNT_POINT;
+	char *path = NULL;
+	char *dev_bootpath = NULL;
+	char root[len];
+	char *x, *opts;
+	int ret = 0;
+	int a = 1;
+	char *nfs_argv[NFS_ARGC + 1] = { "NFS-Mount" };
+
+	for (dev = ifaces; dev; dev = dev->next) {
+		if (dev->ip_server != INADDR_NONE &&
+		    dev->ip_server != INADDR_ANY) {
+			addr.s_addr = dev->ip_server;
+			client = dev->ip_addr;
+			dev_bootpath = dev->bootpath;
+			break;
+		}
+		if (dev->ip_addr != INADDR_NONE && dev->ip_addr != INADDR_ANY)
+			client = dev->ip_addr;
+	}
+
+	/*
+	 * if the "nfsroot" option is set then it overrides
+	 * bootpath supplied by the boot server.
+	 */
+	if ((path = get_arg(argc, argv, "nfsroot=")) == NULL) {
+		if ((path = dev_bootpath) == NULL || path[0] == '\0')
+			/* no path - set a default */
+			path = (char *)"/tftpboot/%s";
+	} else if (dev_bootpath && dev_bootpath[0] != '\0')
+		fprintf(stderr,
+			"nfsroot=%s overrides boot server bootpath %s\n",
+			path, dev_bootpath);
+
+	if ((opts = strchr(path, ',')) != NULL) {
+		*opts++ = '\0';
+		nfs_argv[a++] = (char *)"-o";
+		nfs_argv[a++] = opts;
+	}
+
+	if ((x = strchr(path, ':')) == NULL) {
+		if (addr.s_addr == INADDR_NONE) {
+			fprintf(stderr, "Root-NFS: no server defined\n");
+			exit(1);
+		}
+
+		snprintf(root, len, "%s:%s", inet_ntoa(addr), path);
+	} else {
+		strcpy(root, path);
+	}
+
+	nfs_argv[a++] = sub_client(client, root, len);
+
+	dprintf("NFS-Root: mounting %s on %s with options \"%s\"\n",
+		nfs_argv[a-1], mtpt, opts ? opts : "");
+
+	nfs_argv[a++] = mtpt;
+	nfs_argv[a] = NULL;
+	assert(a <= NFS_ARGC);
+
+	dump_args(a, nfs_argv);
+
+	if ((ret = nfsmount_main(a, nfs_argv)) != 0) {
+		ret = -1;
+		goto done;
+	}
+
+done:
+	return ret;
+}