If the IP header length does not match the size of the UDP packet received
via the raw socket, print both lengths in the warning message.
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parent
730e5ef310
commit
58b4ba768c
12
src/dhcp.c
12
src/dhcp.c
@ -252,13 +252,12 @@ static ssize_t get_raw_packet(struct client_state_t *cs,
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__func__, strerror(errno));
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return -1;
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}
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if (inc != ntohs(packet.ip.tot_len)) {
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log_warning("%s: UDP length does not match header length fields.",
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client_config.interface);
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size_t iphdrlen = ntohs(packet.ip.tot_len);
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if ((size_t)inc != iphdrlen) {
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log_warning("%s: UDP length [%zd] does not match header length field [%zu].",
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client_config.interface, inc, iphdrlen);
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return -2;
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}
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if (!cs->using_dhcp_bpf && !get_raw_packet_validate_bpf(&packet))
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return -2;
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@ -272,8 +271,7 @@ static ssize_t get_raw_packet(struct client_state_t *cs,
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client_config.interface);
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return -2;
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}
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size_t l = ntohs(packet.ip.tot_len) - sizeof packet.ip - sizeof packet.udp;
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size_t l = iphdrlen - sizeof packet.ip - sizeof packet.udp;
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memcpy(payload, &packet.data, l);
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return l;
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}
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