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libslirp/0001-New-utility-slirp_ethe...

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From c6fcedf4f53e070dfcb7a6910624705cdcc0a027 Mon Sep 17 00:00:00 2001
From: Doug Evans <dje@google.com>
Date: Tue, 23 Feb 2021 15:23:19 -0800
Subject: [PATCH 1/2] New utility slirp_ether_ntoa
... and call it everywhere a macaddr is pretty-printed.
Signed-off-by: Doug Evans <dje@google.com>
(cherry picked from commit ac00ba460e101bbce0a167b4f0517378a0fbe6b8)
---
src/arp_table.c | 12 +++++++-----
src/ndp_table.c | 18 ++++++++++--------
src/slirp.c | 11 +++++------
src/util.c | 11 +++++++++++
src/util.h | 8 ++++++++
5 files changed, 41 insertions(+), 19 deletions(-)
diff --git a/src/arp_table.c b/src/arp_table.c
index 959e5b9ec0af..ba8c8a4eee88 100644
--- a/src/arp_table.c
+++ b/src/arp_table.c
@@ -34,11 +34,12 @@ void arp_table_add(Slirp *slirp, uint32_t ip_addr,
~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr;
ArpTable *arptbl = &slirp->arp_table;
int i;
+ char ethaddr_str[ETH_ADDRSTRLEN];
DEBUG_CALL("arp_table_add");
DEBUG_ARG("ip = %s", inet_ntoa((struct in_addr){ .s_addr = ip_addr }));
- DEBUG_ARG("hw addr = %02x:%02x:%02x:%02x:%02x:%02x", ethaddr[0], ethaddr[1],
- ethaddr[2], ethaddr[3], ethaddr[4], ethaddr[5]);
+ DEBUG_ARG("hw addr = %s", slirp_ether_ntoa(ethaddr, ethaddr_str,
+ sizeof(ethaddr_str)));
if (ip_addr == 0 || ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
/* Do not register broadcast addresses */
@@ -67,6 +68,7 @@ bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr;
ArpTable *arptbl = &slirp->arp_table;
int i;
+ char ethaddr_str[ETH_ADDRSTRLEN];
DEBUG_CALL("arp_table_search");
DEBUG_ARG("ip = %s", inet_ntoa((struct in_addr){ .s_addr = ip_addr }));
@@ -81,9 +83,9 @@ bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
for (i = 0; i < ARP_TABLE_SIZE; i++) {
if (arptbl->table[i].ar_sip == ip_addr) {
memcpy(out_ethaddr, arptbl->table[i].ar_sha, ETH_ALEN);
- DEBUG_ARG("found hw addr = %02x:%02x:%02x:%02x:%02x:%02x",
- out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
- out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
+ DEBUG_ARG("found hw addr = %s",
+ slirp_ether_ntoa(out_ethaddr, ethaddr_str,
+ sizeof(ethaddr_str)));
return 1;
}
}
diff --git a/src/ndp_table.c b/src/ndp_table.c
index 110d6ea0e43f..61ae8e0468fc 100644
--- a/src/ndp_table.c
+++ b/src/ndp_table.c
@@ -12,13 +12,14 @@ void ndp_table_add(Slirp *slirp, struct in6_addr ip_addr,
char addrstr[INET6_ADDRSTRLEN];
NdpTable *ndp_table = &slirp->ndp_table;
int i;
+ char ethaddr_str[ETH_ADDRSTRLEN];
inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN);
DEBUG_CALL("ndp_table_add");
DEBUG_ARG("ip = %s", addrstr);
- DEBUG_ARG("hw addr = %02x:%02x:%02x:%02x:%02x:%02x", ethaddr[0], ethaddr[1],
- ethaddr[2], ethaddr[3], ethaddr[4], ethaddr[5]);
+ DEBUG_ARG("hw addr = %s", slirp_ether_ntoa(ethaddr, ethaddr_str,
+ sizeof(ethaddr_str)));
if (IN6_IS_ADDR_MULTICAST(&ip_addr) || in6_zero(&ip_addr)) {
/* Do not register multicast or unspecified addresses */
@@ -50,6 +51,7 @@ bool ndp_table_search(Slirp *slirp, struct in6_addr ip_addr,
char addrstr[INET6_ADDRSTRLEN];
NdpTable *ndp_table = &slirp->ndp_table;
int i;
+ char ethaddr_str[ETH_ADDRSTRLEN];
inet_ntop(AF_INET6, &(ip_addr), addrstr, INET6_ADDRSTRLEN);
@@ -66,18 +68,18 @@ bool ndp_table_search(Slirp *slirp, struct in6_addr ip_addr,
out_ethaddr[3] = ip_addr.s6_addr[13];
out_ethaddr[4] = ip_addr.s6_addr[14];
out_ethaddr[5] = ip_addr.s6_addr[15];
- DEBUG_ARG("multicast addr = %02x:%02x:%02x:%02x:%02x:%02x",
- out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
- out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
+ DEBUG_ARG("multicast addr = %s",
+ slirp_ether_ntoa(out_ethaddr, ethaddr_str,
+ sizeof(ethaddr_str)));
return 1;
}
for (i = 0; i < NDP_TABLE_SIZE; i++) {
if (in6_equal(&ndp_table->table[i].ip_addr, &ip_addr)) {
memcpy(out_ethaddr, ndp_table->table[i].eth_addr, ETH_ALEN);
- DEBUG_ARG("found hw addr = %02x:%02x:%02x:%02x:%02x:%02x",
- out_ethaddr[0], out_ethaddr[1], out_ethaddr[2],
- out_ethaddr[3], out_ethaddr[4], out_ethaddr[5]);
+ DEBUG_ARG("found hw addr = %s",
+ slirp_ether_ntoa(out_ethaddr, ethaddr_str,
+ sizeof(ethaddr_str)));
return 1;
}
}
diff --git a/src/slirp.c b/src/slirp.c
index abb6f9a966d8..1f2513a9e1a4 100644
--- a/src/slirp.c
+++ b/src/slirp.c
@@ -1054,6 +1054,7 @@ int if_encap(Slirp *slirp, struct mbuf *ifm)
uint8_t ethaddr[ETH_ALEN];
const struct ip *iph = (const struct ip *)ifm->m_data;
int ret;
+ char ethaddr_str[ETH_ADDRSTRLEN];
if (ifm->m_len + ETH_HLEN > sizeof(buf)) {
return 1;
@@ -1079,12 +1080,10 @@ int if_encap(Slirp *slirp, struct mbuf *ifm)
}
memcpy(eh->h_dest, ethaddr, ETH_ALEN);
- DEBUG_ARG("src = %02x:%02x:%02x:%02x:%02x:%02x", eh->h_source[0],
- eh->h_source[1], eh->h_source[2], eh->h_source[3],
- eh->h_source[4], eh->h_source[5]);
- DEBUG_ARG("dst = %02x:%02x:%02x:%02x:%02x:%02x", eh->h_dest[0],
- eh->h_dest[1], eh->h_dest[2], eh->h_dest[3], eh->h_dest[4],
- eh->h_dest[5]);
+ DEBUG_ARG("src = %s", slirp_ether_ntoa(eh->h_source, ethaddr_str,
+ sizeof(ethaddr_str)));
+ DEBUG_ARG("dst = %s", slirp_ether_ntoa(eh->h_dest, ethaddr_str,
+ sizeof(ethaddr_str)));
memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
slirp_send_packet_all(slirp, buf, ifm->m_len + ETH_HLEN);
return 1;
diff --git a/src/util.c b/src/util.c
index 2d8fb9642e76..67ef66786f54 100644
--- a/src/util.c
+++ b/src/util.c
@@ -427,3 +427,14 @@ int slirp_fmt0(char *str, size_t size, const char *format, ...)
return rv;
}
+
+const char *slirp_ether_ntoa(const uint8_t *addr, char *out_str,
+ size_t out_str_size)
+{
+ assert(out_str_size >= ETH_ADDRSTRLEN);
+
+ slirp_fmt0(out_str, out_str_size, "%02x:%02x:%02x:%02x:%02x:%02x",
+ addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
+
+ return out_str;
+}
diff --git a/src/util.h b/src/util.h
index d67b3d0de9aa..8134db961779 100644
--- a/src/util.h
+++ b/src/util.h
@@ -84,6 +84,7 @@ struct iovec {
#define SCALE_MS 1000000
#define ETH_ALEN 6
+#define ETH_ADDRSTRLEN 18 /* "xx:xx:xx:xx:xx:xx", with trailing NUL */
#define ETH_HLEN 14
#define ETH_P_IP (0x0800) /* Internet Protocol packet */
#define ETH_P_ARP (0x0806) /* Address Resolution packet */
@@ -186,4 +187,11 @@ void slirp_pstrcpy(char *buf, int buf_size, const char *str);
int slirp_fmt(char *str, size_t size, const char *format, ...) G_GNUC_PRINTF(3, 4);
int slirp_fmt0(char *str, size_t size, const char *format, ...) G_GNUC_PRINTF(3, 4);
+/*
+ * Pretty print a MAC address into out_str.
+ * As a convenience returns out_str.
+ */
+const char *slirp_ether_ntoa(const uint8_t *addr, char *out_str,
+ size_t out_str_len);
+
#endif
--
2.34.1.428.gdcc0cd074f0c
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