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use ephemeral ports

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This commit is contained in:
Jonno Downes 2020-01-19 19:08:49 +11:00 committed by Oliver Schmidt
parent a25ed5051f
commit e0bd530148
1 changed files with 8 additions and 8 deletions
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16
ip65/dns.s
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@ -51,7 +51,7 @@ dns_arcount = 10
dns_qname = 12
dns_server_port = 53
dns_client_port_low_byte: .res 1
dns_client_port_high_byte: .res 1
dns_ip: .res 4 ; will be contain ip address of hostname after succesful exection of dns_resolve
@ -184,9 +184,9 @@ dns_resolve:
@hostname_not_dotted_quad:
ldax #dns_in
stax udp_callback
lda #53
inc dns_client_port_low_byte ; each call to resolve uses a different client address
ldx dns_client_port_low_byte ; so we don't get confused by late replies to a previous call
ldx #53
inc dns_client_port_high_byte ; each call to resolve uses a different client address
lda dns_client_port_high_byte ; so we don't get confused by late replies to a previous call
jsr udp_add_listener
bcc :+
@ -255,8 +255,8 @@ dns_resolve:
clc ; signal success
@done:
php
lda #53
ldx dns_client_port_low_byte
ldx #53
lda dns_client_port_high_byte
jsr udp_remove_listener
plp
rts
@ -302,8 +302,8 @@ send_dns_query:
ldx #0
stax udp_send_len
lda #53
ldx dns_client_port_low_byte
ldx #53
lda dns_client_port_high_byte
stax udp_send_src_port
ldx #3 ; set destination address