[Dnsmasq-discuss] --server order / default if fail

[renmingshuai]

For the firest question, if more than one one entry, not in strict-order, dnsmasq will forward the query to all nameservers according to matching rules which are set by these entries.
For the second question, when dnsmasq start with -server=/xpto.biz/192.168.1.1 at tun0<mailto:-server=/xpto.biz/192.168.1.1 at tun0>, dnsmasq will call setsockopt() in local_bind() and try to bind socket with device. if bind not success, dnsmasq will drop this query.

gdb info
#0  local_bind (fd=fd at entry=12, addr=addr at entry=0xaaaaaab143ac, intname=intname at entry=0xaaaaaab143c8 "tuno", ifindex=0, is_tcp=is_tcp at entry=0) at network.c:1235
#1  0x0000aaaaaaabf7fc in random_sock (s=s at entry=0xaaaaaab14390) at forward.c:2185
#2  0x0000aaaaaaac12a0 in allocate_rfd (fdlp=0xaaaaaab1c160, serv=0xaaaaaab14390) at forward.c:2290
#3  0x0000aaaaaaac1b50 in forward_query (udpfd=0, udpaddr=udpaddr at entry=0xfffffffff068, dst_addr=0xaaaaaaac71dc <check_dns_listeners+924>,
    dst_addr at entry=0xfffffffff0c8, dst_iface=65535, dst_iface at entry=2, header=header at entry=0xaaaaaab154a0, plen=63, plen at entry=0, now=now at entry=1647934955,
    forward=<optimized out>, forward at entry=0x0, ad_reqd=<optimized out>, ad_reqd at entry=1, do_bit=<optimized out>, do_bit at entry=-1431225600) at forward.c:511
#4  0x0000aaaaaaac2868 in receive_query (listen=0xaaaaaab14980, now=1647934955) at forward.c:1583
#5  0x0000aaaaaaac71dc in check_dns_listeners (now=1647934955) at dnsmasq.c:1786
#6  0x0000aaaaaaaac074 in main (argc=<optimized out>, argv=<optimized out>) at dnsmasq.c:1207

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