From 04158e04591efea20f34c8dc83002e19056a5590 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko
Date: Mon, 2 Feb 2009 10:48:06 +0000
Subject: udhcpd: add code which rejects lease files with suspicious or old
 timestamp. *: s/time(0)/time(NULL)/g

---
 e2fsprogs/old_e2fsprogs/blkid/devname.c    |  4 ++--
 e2fsprogs/old_e2fsprogs/blkid/probe.c      |  4 ++--
 e2fsprogs/old_e2fsprogs/e2fsck.c           | 28 +++++++++++++-------------
 e2fsprogs/old_e2fsprogs/ext2fs/bb_inode.c  |  4 ++--
 e2fsprogs/old_e2fsprogs/ext2fs/mkjournal.c |  2 +-
 e2fsprogs/old_e2fsprogs/ext2fs/res_gdt.c   |  4 ++--
 networking/httpd.c                         |  2 +-
 networking/udhcp/dhcpd.c                   |  4 ++--
 networking/udhcp/files.c                   | 32 ++++++++++++++++--------------
 runit/sv.c                                 |  4 ++--
 util-linux/rtcwake.c                       |  2 +-
 11 files changed, 46 insertions(+), 44 deletions(-)

diff --git a/e2fsprogs/old_e2fsprogs/blkid/devname.c b/e2fsprogs/old_e2fsprogs/blkid/devname.c
index 5b9e48f..348e5d4 100644
--- a/e2fsprogs/old_e2fsprogs/blkid/devname.c
+++ b/e2fsprogs/old_e2fsprogs/blkid/devname.c
@@ -273,7 +273,7 @@ int blkid_probe_all(blkid_cache cache)
 		return -BLKID_ERR_PARAM;
 
 	if (cache->bic_flags & BLKID_BIC_FL_PROBED &&
-	    time(0) - cache->bic_time < BLKID_PROBE_INTERVAL)
+	    time(NULL) - cache->bic_time < BLKID_PROBE_INTERVAL)
 		return 0;
 
 	blkid_read_cache(cache);
@@ -335,7 +335,7 @@ int blkid_probe_all(blkid_cache cache)
 
 	fclose(proc);
 
-	cache->bic_time = time(0);
+	cache->bic_time = time(NULL);
 	cache->bic_flags |= BLKID_BIC_FL_PROBED;
 	blkid_flush_cache(cache);
 	return 0;
diff --git a/e2fsprogs/old_e2fsprogs/blkid/probe.c b/e2fsprogs/old_e2fsprogs/blkid/probe.c
index 48b240e..1f7188e 100644
--- a/e2fsprogs/old_e2fsprogs/blkid/probe.c
+++ b/e2fsprogs/old_e2fsprogs/blkid/probe.c
@@ -562,7 +562,7 @@ blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
 	if (!dev)
 		return NULL;
 
-	now = time(0);
+	now = time(NULL);
 	diff = now - dev->bid_time;
 
 	if ((now < dev->bid_time) ||
@@ -659,7 +659,7 @@ try_again:
 found_type:
 	if (dev && type) {
 		dev->bid_devno = st.st_rdev;
-		dev->bid_time = time(0);
+		dev->bid_time = time(NULL);
 		dev->bid_flags |= BLKID_BID_FL_VERIFIED;
 		cache->bic_flags |= BLKID_BIC_FL_CHANGED;
 
diff --git a/e2fsprogs/old_e2fsprogs/e2fsck.c b/e2fsprogs/old_e2fsprogs/e2fsck.c
index b927a9f..6ade0db 100644
--- a/e2fsprogs/old_e2fsprogs/e2fsck.c
+++ b/e2fsprogs/old_e2fsprogs/e2fsck.c
@@ -2270,7 +2270,7 @@ static void e2fsck_move_ext3_journal(e2fsck_t ctx)
 	ext2fs_mark_super_dirty(fs);
 	fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 	inode.i_links_count = 0;
-	inode.i_dtime = time(0);
+	inode.i_dtime = time(NULL);
 	if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
 		goto err_out;
 
@@ -3381,7 +3381,7 @@ static void e2fsck_pass1(e2fsck_t ctx)
 			 */
 			if (!LINUX_S_ISDIR(inode->i_mode)) {
 				if (fix_problem(ctx, PR_1_ROOT_NO_DIR, &pctx)) {
-					inode->i_dtime = time(0);
+					inode->i_dtime = time(NULL);
 					inode->i_links_count = 0;
 					ext2fs_icount_store(ctx->inode_link_info,
 							    ino, 0);
@@ -3475,7 +3475,7 @@ static void e2fsck_pass1(e2fsck_t ctx)
 		    inode->i_dtime < ctx->fs->super->s_inodes_count) {
 			if (fix_problem(ctx, PR_1_LOW_DTIME, &pctx)) {
 				inode->i_dtime = inode->i_links_count ?
-					0 : time(0);
+					0 : time(NULL);
 				e2fsck_write_inode(ctx, ino, inode,
 						   "pass1");
 			}
@@ -3489,7 +3489,7 @@ static void e2fsck_pass1(e2fsck_t ctx)
 			if (!inode->i_dtime && inode->i_mode) {
 				if (fix_problem(ctx,
 					    PR_1_ZERO_DTIME, &pctx)) {
-					inode->i_dtime = time(0);
+					inode->i_dtime = time(NULL);
 					e2fsck_write_inode(ctx, ino, inode,
 							   "pass1");
 				}
@@ -3659,7 +3659,7 @@ static void e2fsck_pass1(e2fsck_t ctx)
 		}
 		e2fsck_read_inode(ctx, EXT2_RESIZE_INO, inode,
 				  "recreate inode");
-		inode->i_mtime = time(0);
+		inode->i_mtime = time(NULL);
 		e2fsck_write_inode(ctx, EXT2_RESIZE_INO, inode,
 				  "recreate inode");
 		fs->block_map = save_bmap;
@@ -4169,7 +4169,7 @@ static void check_blocks(e2fsck_t ctx, struct problem_context *pctx,
 	if (pb.clear) {
 		inode->i_links_count = 0;
 		ext2fs_icount_store(ctx->inode_link_info, ino, 0);
-		inode->i_dtime = time(0);
+		inode->i_dtime = time(NULL);
 		dirty_inode++;
 		ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, ino);
 		ext2fs_unmark_inode_bitmap(ctx->inode_reg_map, ino);
@@ -4202,7 +4202,7 @@ static void check_blocks(e2fsck_t ctx, struct problem_context *pctx,
 		if (fix_problem(ctx, PR_1_ZERO_LENGTH_DIR, pctx)) {
 			inode->i_links_count = 0;
 			ext2fs_icount_store(ctx->inode_link_info, ino, 0);
-			inode->i_dtime = time(0);
+			inode->i_dtime = time(NULL);
 			dirty_inode++;
 			ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, ino);
 			ext2fs_unmark_inode_bitmap(ctx->inode_reg_map, ino);
@@ -5147,7 +5147,7 @@ static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
 	/* Inode may have changed by block_iterate, so reread it */
 	e2fsck_read_inode(ctx, ino, &inode, "delete_file");
 	inode.i_links_count = 0;
-	inode.i_dtime = time(0);
+	inode.i_dtime = time(NULL);
 	if (inode.i_file_acl &&
 	    (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
 		count = 1;
@@ -6393,7 +6393,7 @@ static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
 	ext2fs_icount_store(ctx->inode_link_info, ino, 0);
 	e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
 	inode.i_links_count = 0;
-	inode.i_dtime = time(0);
+	inode.i_dtime = time(NULL);
 	e2fsck_write_inode(ctx, ino, &inode, "deallocate_inode");
 	clear_problem_context(&pctx);
 	pctx.ino = ino;
@@ -6890,7 +6890,7 @@ static void check_root(e2fsck_t ctx)
 	memset(&inode, 0, sizeof(inode));
 	inode.i_mode = 040755;
 	inode.i_size = fs->blocksize;
-	inode.i_atime = inode.i_ctime = inode.i_mtime = time(0);
+	inode.i_atime = inode.i_ctime = inode.i_mtime = time(NULL);
 	inode.i_links_count = 2;
 	inode.i_blocks = fs->blocksize / 512;
 	inode.i_block[0] = blk;
@@ -7138,7 +7138,7 @@ ext2_ino_t e2fsck_get_lost_and_found(e2fsck_t ctx, int fix)
 	memset(&inode, 0, sizeof(inode));
 	inode.i_mode = 040700;
 	inode.i_size = fs->blocksize;
-	inode.i_atime = inode.i_ctime = inode.i_mtime = time(0);
+	inode.i_atime = inode.i_ctime = inode.i_mtime = time(NULL);
 	inode.i_links_count = 2;
 	inode.i_blocks = fs->blocksize / 512;
 	inode.i_block[0] = blk;
@@ -7492,7 +7492,7 @@ static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i)
 		if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
 			ext2fs_icount_store(ctx->inode_link_info, i, 0);
 			inode.i_links_count = 0;
-			inode.i_dtime = time(0);
+			inode.i_dtime = time(NULL);
 			e2fsck_write_inode(ctx, i, &inode,
 					   "disconnect_inode");
 			/*
@@ -11558,7 +11558,7 @@ static int release_orphan_inodes(e2fsck_t ctx)
 		if (!inode.i_links_count) {
 			ext2fs_inode_alloc_stats2(fs, ino, -1,
 						  LINUX_S_ISDIR(inode.i_mode));
-			inode.i_dtime = time(0);
+			inode.i_dtime = time(NULL);
 		} else {
 			inode.i_dtime = 0;
 		}
@@ -12714,7 +12714,7 @@ static void check_if_skip(e2fsck_t ctx)
 	unsigned int reason_arg = 0;
 	long next_check;
 	int batt = is_on_batt();
-	time_t now = time(0);
+	time_t now = time(NULL);
 
 	if ((ctx->options & E2F_OPT_FORCE) || cflag || swapfs)
 		return;
diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/bb_inode.c b/e2fsprogs/old_e2fsprogs/ext2fs/bb_inode.c
index 855f86e..1deae54 100644
--- a/e2fsprogs/old_e2fsprogs/ext2fs/bb_inode.c
+++ b/e2fsprogs/old_e2fsprogs/ext2fs/bb_inode.c
@@ -125,9 +125,9 @@ errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list)
 	if (retval)
 		goto cleanup;
 
-	inode.i_atime = inode.i_mtime = time(0);
+	inode.i_atime = inode.i_mtime = time(NULL);
 	if (!inode.i_ctime)
-		inode.i_ctime = time(0);
+		inode.i_ctime = time(NULL);
 	inode.i_blocks = rec.bad_block_count * (fs->blocksize / 512);
 	inode.i_size = rec.bad_block_count * fs->blocksize;
 
diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/mkjournal.c b/e2fsprogs/old_e2fsprogs/ext2fs/mkjournal.c
index 5bdd346..af47aee 100644
--- a/e2fsprogs/old_e2fsprogs/ext2fs/mkjournal.c
+++ b/e2fsprogs/old_e2fsprogs/ext2fs/mkjournal.c
@@ -231,7 +231,7 @@ static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
 
 	inode.i_size += fs->blocksize * size;
 	inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
-	inode.i_mtime = inode.i_ctime = time(0);
+	inode.i_mtime = inode.i_ctime = time(NULL);
 	inode.i_links_count = 1;
 	inode.i_mode = LINUX_S_IFREG | 0600;
 
diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/res_gdt.c b/e2fsprogs/old_e2fsprogs/ext2fs/res_gdt.c
index 31cc89e..3c550d5 100644
--- a/e2fsprogs/old_e2fsprogs/ext2fs/res_gdt.c
+++ b/e2fsprogs/old_e2fsprogs/ext2fs/res_gdt.c
@@ -117,7 +117,7 @@ errcode_t ext2fs_create_resize_inode(ext2_filsys fs)
 			sb->s_feature_ro_compat |=
 				EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
 		}
-		inode.i_ctime = time(0);
+		inode.i_ctime = time(NULL);
 	}
 
 	for (rsv_off = 0, gdt_off = fs->desc_blocks,
@@ -209,7 +209,7 @@ out_inode:
 	       inode.i_size);
 #endif
 	if (inode_dirty) {
-		inode.i_atime = inode.i_mtime = time(0);
+		inode.i_atime = inode.i_mtime = time(NULL);
 		retval2 = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
 		if (!retval)
 			retval = retval2;
diff --git a/networking/httpd.c b/networking/httpd.c
index 3a2e6b1..fc8b512 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -969,7 +969,7 @@ static void send_headers(int responseNum)
 	const char *error_page = NULL;
 #endif
 	unsigned i;
-	time_t timer = time(0);
+	time_t timer = time(NULL);
 	char tmp_str[80];
 	int len;
 
diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
index d0a1eba..ebf3017 100644
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -255,13 +255,13 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
 			DEBUG("Received DECLINE");
 			if (lease) {
 				memset(lease->chaddr, 0, 16);
-				lease->expires = time(0) + server_config.decline_time;
+				lease->expires = time(NULL) + server_config.decline_time;
 			}
 			break;
 		case DHCPRELEASE:
 			DEBUG("Received RELEASE");
 			if (lease)
-				lease->expires = time(0);
+				lease->expires = time(NULL);
 			break;
 		case DHCPINFORM:
 			DEBUG("Received INFORM");
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index 64edcbb..fb6fe01 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -36,6 +36,7 @@ static int read_ip(const char *line, void *arg)
 	return 1;
 }
 
+
 static int read_mac(const char *line, void *arg)
 {
 	return NULL == ether_aton_r(line, (struct ether_addr *)arg);
@@ -362,7 +363,7 @@ void FAST_FUNC write_leases(void)
 		if (leases[i].yiaddr == 0)
 			continue;
 
-		/* screw with the time in the struct, for easier writing */
+		/* Screw with the time in the struct, for easier writing */
 		tmp_time = leases[i].expires;
 
 		leases[i].expires -= curr;
@@ -374,7 +375,7 @@ void FAST_FUNC write_leases(void)
 		 * we lose some leases on restart. Oh well. */
 		full_write(fd, &leases[i], sizeof(leases[i]));
 
-		/* then restore it when done */
+		/* Then restore it when done */
 		leases[i].expires = tmp_time;
 	}
 	close(fd);
@@ -390,10 +391,10 @@ void FAST_FUNC write_leases(void)
 
 void FAST_FUNC read_leases(const char *file)
 {
-	int fd;
-	unsigned i;
 	struct dhcpOfferedAddr lease;
-	int64_t written_at, curr;
+	int64_t written_at, time_passed;
+	int fd;
+	USE_UDHCP_DEBUG(unsigned i;)
 
 	fd = open_or_warn(file, O_RDONLY);
 	if (fd < 0)
@@ -402,18 +403,19 @@ void FAST_FUNC read_leases(const char *file)
 	if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at))
 		goto ret;
 	written_at = ntoh64(written_at);
-	curr = time(NULL);
-	if (curr < written_at)
-		written_at = curr; /* lease file from future! :) */
-
-	i = 0;
-	while (i < server_config.max_leases
-	 && full_read(fd, &lease, sizeof(lease)) == sizeof(lease)
-	) {
+
+	time_passed = time(NULL) - written_at;
+	/* Strange written_at, or lease file from old version of udhcpd
+	 * which had no "written_at" field? */
+	if ((uint64_t)time_passed > 12 * 60 * 60)
+		goto ret;
+
+	USE_UDHCP_DEBUG(i = 0;)
+	while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
 		/* ADDME: what if it matches some static lease? */
 		uint32_t y = ntohl(lease.yiaddr);
 		if (y >= server_config.start_ip && y <= server_config.end_ip) {
-			int64_t expires = ntohl(lease.expires) + written_at - curr;
+			signed_leasetime_t expires = ntohl(lease.expires) - (signed_leasetime_t)time_passed;
 			if (expires <= 0)
 				continue;
 			/* NB: add_lease takes "relative time", IOW,
@@ -422,7 +424,7 @@ void FAST_FUNC read_leases(const char *file)
 				bb_error_msg("too many leases while loading %s", file);
 				break;
 			}
-			i++;
+			USE_UDHCP_DEBUG(i++;)
 		}
 	}
 	DEBUG("Read %d leases", i);
diff --git a/runit/sv.c b/runit/sv.c
index 7e5efde..20e8619 100644
--- a/runit/sv.c
+++ b/runit/sv.c
@@ -445,7 +445,7 @@ int sv_main(int argc, char **argv)
 	service = argv;
 	services = argc - 1;
 
-	tnow = time(0) + 0x400000000000000aULL;
+	tnow = time(NULL) + 0x400000000000000aULL;
 	tstart = tnow;
 	curdir = open_read(".");
 	if (curdir == -1)
@@ -592,7 +592,7 @@ int sv_main(int argc, char **argv)
 		}
 		if (want_exit) break;
 		usleep(420000);
-		tnow = time(0) + 0x400000000000000aULL;
+		tnow = time(NULL) + 0x400000000000000aULL;
 	}
 	return rc > 99 ? 99 : rc;
 }
diff --git a/util-linux/rtcwake.c b/util-linux/rtcwake.c
index 6c399c7..9a73ba2 100644
--- a/util-linux/rtcwake.c
+++ b/util-linux/rtcwake.c
@@ -159,7 +159,7 @@ int rtcwake_main(int argc UNUSED_PARAM, char **argv)
 		bb_error_msg_and_die("%s not enabled for wakeup events", rtcname);
 
 	/* relative or absolute alarm time, normalized to time_t */
-	sys_time = time(0);
+	sys_time = time(NULL);
 	if (sys_time == (time_t)-1)
 		bb_perror_msg_and_die("read system time");
 	rtc_time = rtc_read_time(fd, utc);
-- 
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