netdev - [PATCH iproute2-next 3/4] ip6tunnel: Use do_each_proc_net

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Date:   Wed, 31 Jan 2018 21:49:48 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2-next 3/4] ip6tunnel: Use do_each_proc_net_dev()

Now we have helper to iterate over entries in /proc/net/dev we can
simplify and cleanup do_tunnels_list() in ip/iptunnel.c.

While there replace printf("\n") with fputc('\n', stdout) and printf()
with fputs() where string does not contain format specifiers.

Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
---
 ip/ip6tunnel.c |   94 ++++++++++++++++++++++----------------------------------
 1 file changed, 37 insertions(+), 57 deletions(-)

diff --git a/ip/ip6tunnel.c b/ip/ip6tunnel.c
index 783e28a..ccd5603 100644
--- a/ip/ip6tunnel.c
+++ b/ip/ip6tunnel.c
@@ -336,68 +336,48 @@ static int ip6_tnl_parm_match(const struct ip6_tnl_parm2 *p1,
 		(!p1->flags || (p1->flags & p2->flags)));
 }
 
-static int do_tunnels_list(struct ip6_tnl_parm2 *p)
+static pnd_result_t do_tunnels_list(char *name, char *stats, void *arg)
 {
-	char buf[512];
-	int err = -1;
-	FILE *fp = fopen("/proc/net/dev", "r");
+	struct ip6_tnl_parm2 p1, *p = arg;
+	int index, type;
 
-	if (fp == NULL) {
-		perror("fopen");
-		return -1;
-	}
+	if (p->name[0] && strcmp(p->name, name))
+		return PND_NEXT;
+
+	index = ll_name_to_index(name);
+	if (index <= 0)
+		return PND_NEXT;
 
-	/* skip two lines at the begenning of the file */
-	if (!fgets(buf, sizeof(buf), fp) ||
-	    !fgets(buf, sizeof(buf), fp)) {
-		fprintf(stderr, "/proc/net/dev read error\n");
-		goto end;
+	type = ll_index_to_type(index);
+	if (type == -1) {
+		fprintf(stderr, "Failed to get type of \"%s\"\n", name);
+		return PND_NEXT;
 	}
 
-	while (fgets(buf, sizeof(buf), fp) != NULL) {
-		char name[IFNAMSIZ];
-		int index, type;
-		struct ip6_tnl_parm2 p1 = {};
-		char *ptr;
-
-		buf[sizeof(buf) - 1] = '\0';
-		if ((ptr = strchr(buf, ':')) == NULL ||
-		    (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
-			fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
-			goto end;
-		}
-		if (p->name[0] && strcmp(p->name, name))
-			continue;
-		index = ll_name_to_index(name);
-		if (index == 0)
-			continue;
-		type = ll_index_to_type(index);
-		if (type == -1) {
-			fprintf(stderr, "Failed to get type of \"%s\"\n", name);
-			continue;
-		}
-		if (type != ARPHRD_TUNNEL6 && type != ARPHRD_IP6GRE)
-			continue;
-		ip6_tnl_parm_init(&p1, 0);
-		if (type == ARPHRD_IP6GRE)
-			p1.proto = IPPROTO_GRE;
-		strcpy(p1.name, name);
-		p1.link = ll_name_to_index(p1.name);
-		if (p1.link == 0)
-			continue;
-		if (tnl_get_ioctl(p1.name, &p1))
-			continue;
-		if (!ip6_tnl_parm_match(p, &p1))
-			continue;
-		print_tunnel(&p1);
-		if (show_stats)
-			tnl_print_stats(ptr);
-		printf("\n");
+	switch (type) {
+	case ARPHRD_TUNNEL6:
+	case ARPHRD_IP6GRE:
+		return PND_NEXT;
 	}
-	err = 0;
- end:
-	fclose(fp);
-	return err;
+
+	ip6_tnl_parm_init(&p1, 0);
+	if (type == ARPHRD_IP6GRE)
+		p1.proto = IPPROTO_GRE;
+	p1.link = index;
+	name = strcpy(p1.name, name);
+
+	if (tnl_get_ioctl(name, &p1))
+		return PND_NEXT;
+
+	if (!ip6_tnl_parm_match(p, &p1))
+		return PND_NEXT;
+
+	print_tunnel(&p1);
+	if (show_stats)
+		tnl_print_stats(stats);
+	fputc('\n', stdout);
+
+	return PND_NEXT;
 }
 
 static int do_show(int argc, char **argv)
@@ -412,7 +392,7 @@ static int do_show(int argc, char **argv)
 		return -1;
 
 	if (!p.name[0] || show_stats)
-		do_tunnels_list(&p);
+		do_each_proc_net_dev(do_tunnels_list, &p);
 	else {
 		if (tnl_get_ioctl(p.name, &p))
 			return -1;
-- 
1.7.10.4