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arp, dhcp: Fix strict aliasing warnings reported by gcc 4.9 with -Ofast

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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2022-02-28 22:17:32 +01:00
parent 213c397492
commit 2fa1cef016
2 changed files with 9 additions and 8 deletions
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3
arp.c
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@ -58,7 +58,8 @@ int arp(struct ctx *c, struct ethhdr *eh, size_t len)
/* Discard announcements (but not 0.0.0.0 "probes"): we might have the
* same IP address, hide that.
*/
if (*((uint32_t *)&am->sip) && !memcmp(am->sip, am->tip, 4))
if (memcmp(am->sip, (unsigned char[4]){ 0, 0, 0, 0 }, 4) &&
!memcmp(am->sip, am->tip, 4))
return 1;
/* Don't resolve our own address, either. */

14
dhcp.c
View file

@ -40,9 +40,9 @@
struct opt {
int sent;
int slen;
unsigned char s[255];
uint8_t s[255];
int clen;
unsigned char c[255];
uint8_t c[255];
};
static struct opt opts[255];
@ -312,9 +312,9 @@ int dhcp(struct ctx *c, struct ethhdr *eh, size_t len)
m->chaddr[3], m->chaddr[4], m->chaddr[5]);
m->yiaddr = c->addr4;
*(unsigned long *)opts[1].s = c->mask4;
*(unsigned long *)opts[3].s = c->gw4;
*(unsigned long *)opts[54].s = c->gw4;
memcpy(opts[1].s, &c->mask4, sizeof(c->mask4));
memcpy(opts[3].s, &c->gw4, sizeof(c->gw4));
memcpy(opts[54].s, &c->gw4, sizeof(c->gw4));
/* If the gateway is not on the assigned subnet, send an option 121
* (Classless Static Routing) adding a dummy route to it.
@ -323,8 +323,8 @@ int dhcp(struct ctx *c, struct ethhdr *eh, size_t len)
/* a.b.c.d/32:0.0.0.0, 0:a.b.c.d */
opts[121].slen = 14;
opts[121].s[0] = 32;
*(unsigned long *)&opts[121].s[1] = c->gw4;
*(unsigned long *)&opts[121].s[10] = c->gw4;
memcpy(opts[121].s + 1, &c->gw4, sizeof(c->gw4));
memcpy(opts[121].s + 10, &c->gw4, sizeof(c->gw4));
}
if (c->mtu != -1) {