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Add mg_srand() and seed with some entropy

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This commit is contained in:
Sergio R. Caprile 2023-02-09 12:01:14 -03:00
parent 9deaa81a72
commit 60c6b04a01
2 changed files with 12 additions and 4 deletions
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8
mongoose.c
View File

@ -7355,6 +7355,7 @@ static void onstatechange(struct mg_tcpip_if *ifp) {
arp_ask(ifp, ifp->gw);
} else if (ifp->state == MIP_STATE_UP) {
MG_ERROR(("Link up"));
srand((unsigned int) mg_millis());
} else if (ifp->state == MIP_STATE_DOWN) {
MG_ERROR(("Link down"));
}
@ -7528,6 +7529,9 @@ static void rx_dhcp_client(struct mg_tcpip_if *ifp, struct pkt *pkt) {
ifp->state = MIP_STATE_READY;
onstatechange(ifp);
tx_dhcp_request(ifp, pkt->eth->src, ip, pkt->dhcp->siaddr);
uint64_t rand;
mg_random(&rand, sizeof(rand));
srand((unsigned int) (rand + mg_millis()));
}
}
@ -7967,8 +7971,8 @@ void mg_tcpip_init(struct mg_mgr *mgr, struct mg_tcpip_if *ifp) {
// If MAC address is not set, make a random one
if (ifp->mac[0] == 0 && ifp->mac[1] == 0 && ifp->mac[2] == 0 &&
ifp->mac[3] == 0 && ifp->mac[4] == 0 && ifp->mac[5] == 0) {
mg_random(ifp->mac, sizeof(ifp->mac));
ifp->mac[0] &= (uint8_t) ~1; // Clear bit 0. 1st byte is even (unicast)
ifp->mac[0] = 0x02; // Locally administered, unicast
mg_random(&ifp->mac[1], sizeof(ifp->mac) - 1);
MG_INFO(("MAC not set. Generated random: %M", mg_print_mac, ifp->mac));
}

8
src/tcpip/tcpip.c
View File

@ -227,6 +227,7 @@ static void onstatechange(struct mg_tcpip_if *ifp) {
arp_ask(ifp, ifp->gw);
} else if (ifp->state == MIP_STATE_UP) {
MG_ERROR(("Link up"));
srand((unsigned int) mg_millis());
} else if (ifp->state == MIP_STATE_DOWN) {
MG_ERROR(("Link down"));
}
@ -400,6 +401,9 @@ static void rx_dhcp_client(struct mg_tcpip_if *ifp, struct pkt *pkt) {
ifp->state = MIP_STATE_READY;
onstatechange(ifp);
tx_dhcp_request(ifp, pkt->eth->src, ip, pkt->dhcp->siaddr);
uint64_t rand;
mg_random(&rand, sizeof(rand));
srand((unsigned int) (rand + mg_millis()));
}
}
@ -839,8 +843,8 @@ void mg_tcpip_init(struct mg_mgr *mgr, struct mg_tcpip_if *ifp) {
// If MAC address is not set, make a random one
if (ifp->mac[0] == 0 && ifp->mac[1] == 0 && ifp->mac[2] == 0 &&
ifp->mac[3] == 0 && ifp->mac[4] == 0 && ifp->mac[5] == 0) {
mg_random(ifp->mac, sizeof(ifp->mac));
ifp->mac[0] &= (uint8_t) ~1; // Clear bit 0. 1st byte is even (unicast)
ifp->mac[0] = 0x02; // Locally administered, unicast
mg_random(&ifp->mac[1], sizeof(ifp->mac) - 1);
MG_INFO(("MAC not set. Generated random: %M", mg_print_mac, ifp->mac));
}