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util: Helper for formatting MAC addresses

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There are a couple of places where we somewhat messily open code formatting
an Ethernet like MAC address for display.  Add an eth_ntop() helper for
this.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-08-21 14:19:58 +10:00 committed by Stefano Brivio
parent e6feb5a892
commit 066e69986b
4 changed files with 27 additions and 7 deletions
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7
conf.c
View file

@ -921,7 +921,8 @@ pasta_opts:
*/
static void conf_print(const struct ctx *c)
{
char buf4[INET_ADDRSTRLEN], buf6[INET6_ADDRSTRLEN], ifn[IFNAMSIZ];
char buf4[INET_ADDRSTRLEN], buf6[INET6_ADDRSTRLEN];
char bufmac[ETH_ADDRSTRLEN], ifn[IFNAMSIZ];
int i;
info("Template interface: %s%s%s%s%s",
@ -955,9 +956,7 @@ static void conf_print(const struct ctx *c)
info("Namespace interface: %s", c->pasta_ifn);
info("MAC:");
info(" host: %02x:%02x:%02x:%02x:%02x:%02x",
c->mac[0], c->mac[1], c->mac[2],
c->mac[3], c->mac[4], c->mac[5]);
info(" host: %s", eth_ntop(c->mac, bufmac, sizeof(bufmac)));
if (c->ifi4) {
if (!c->no_dhcp) {

5
dhcp.c
View file

@ -276,6 +276,7 @@ static void opt_set_dns_search(const struct ctx *c, size_t max_len)
int dhcp(const struct ctx *c, const struct pool *p)
{
size_t mlen, dlen, offset = 0, opt_len, opt_off = 0;
char macstr[ETH_ADDRSTRLEN];
const struct ethhdr *eh;
const struct iphdr *iph;
const struct udphdr *uh;
@ -340,9 +341,7 @@ int dhcp(const struct ctx *c, const struct pool *p)
return -1;
}
info(" from %02x:%02x:%02x:%02x:%02x:%02x",
m->chaddr[0], m->chaddr[1], m->chaddr[2],
m->chaddr[3], m->chaddr[4], m->chaddr[5]);
info(" from %s", eth_ntop(m->chaddr, macstr, sizeof(macstr)));
m->yiaddr = c->ip4.addr;
mask.s_addr = htonl(0xffffffff << (32 - c->ip4.prefix_len));

19
util.c
View file

@ -676,6 +676,25 @@ const char *sockaddr_ntop(const void *sa, char *dst, socklen_t size)
return dst;
}
/** eth_ntop() - Convert an Ethernet MAC address to text format
* @mac: MAC address
* @dst: Output buffer, minimum ETH_ADDRSTRLEN bytes
* @size: Size of buffer at @dst
*
* Return: On success, a non-null pointer to @dst, NULL on failure
*/
const char *eth_ntop(const unsigned char *mac, char *dst, size_t size)
{
int len;
len = snprintf(dst, size, "%02x:%02x:%02x:%02x:%02x:%02x",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
if (len < 0 || (size_t)len >= size)
return NULL;
return dst;
}
/** str_ee_origin() - Convert socket extended error origin to a string
* @ee: Socket extended error structure
*

3
util.h
View file

@ -215,9 +215,12 @@ static inline const char *af_name(sa_family_t af)
#define SOCKADDR_STRLEN MAX(SOCKADDR_INET_STRLEN, SOCKADDR_INET6_STRLEN)
#define ETH_ADDRSTRLEN (sizeof("00:11:22:33:44:55"))
struct sock_extended_err;
const char *sockaddr_ntop(const void *sa, char *dst, socklen_t size);
const char *eth_ntop(const unsigned char *mac, char *dst, size_t size);
const char *str_ee_origin(const struct sock_extended_err *ee);
/**