mirror of
https://github.com/bobbimanners/emailler.git
synced 2024-11-15 02:04:28 +00:00
105 lines
2.8 KiB
Ruby
105 lines
2.8 KiB
Ruby
#cartridge offsets:
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# $18=MAC address (6 bytes)
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# $1E=IP address (4 bytes)
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# $22=netmask (4 bytes)
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# $26=gateway (4 bytes)
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# $2A=DNS (4 bytes)
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# $2E=TFTP server (4 bytes)
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@cartridge_offsets={
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#symobol => offset, length
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:mac=>[0x18,6],
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:ip=>[0x1e,4],
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:netmask=>[0x22,4],
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:gateway=>[0x26,4],
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:dns=>[0x2a,4],
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:tftp=>[0x2e,4],
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}
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@progname=File.basename($0)
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def show_options
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puts "valid options are: #{@cartridge_offsets.keys.join(", ")}"
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puts "mac auto will automagically generate a pseudorandom MAC"
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end
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def usage
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puts "#{@progname} <image> <option> <value> [<option> <value> ..]"
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puts "multiple options may be set"
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show_options
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true
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end
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number_of_options=ARGV.length
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usage && exit unless number_of_options>=3
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usage && exit unless (number_of_options%2) ==1 #must be an odd number of options
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filename=ARGV[0]
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if !(FileTest.file?(filename)) then
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puts "file '#{filename}' not found"
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exit
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end
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filebytes=File.open(filename,"rb").read
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start_of_nb65_cart_image=filebytes.index("80NB65")
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if start_of_nb65_cart_image.nil? then
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puts "file '#{filename}' does not appear to be a netboot65 cartridge image"
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exit
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end
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(number_of_options/2).times do |i|
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option=ARGV[i*2+1]
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value=ARGV[i*2+2]
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# puts "#{option} : #{value}"
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offsets=@cartridge_offsets[option.to_sym]
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if offsets.nil? then
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puts "invalid option #{option}"
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show_options
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exit
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end
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option_offset=start_of_nb65_cart_image+offsets[0]-7
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option_length=offsets[1]
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if option_length==6 then
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if value.downcase=="auto" then
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require 'digest/md5'
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digest = Digest::MD5.digest(Time.now.to_s)
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mac=[0x00,0x80,0x10,digest[0],digest[1],Kernel.rand(255)]
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else
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split_values=value.split(":")
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if (split_values.length!=6) || (split_values[5].nil?) then
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puts "'#{value}' is not a valid MAC address. (e.g. 12:34:56:78:ab:cd)"
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exit
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end
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mac=[]
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6.times do |j|
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mac[j]=split_values[j].hex
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# puts "#{split_values[j]}->#{"%02X" % mac[j]}"
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end
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end
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packed_option=mac.pack("cccccc")
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else #it must be an IP
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split_values=value.split(".")
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if (split_values.length!=4) || (split_values[3].nil?) then
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puts "'#{value}' is not a valid IP format. (e.g. 192.168.1.64)"
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exit
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end
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ip=[]
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4.times do |j|
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ip[j]=split_values[j].to_i
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# puts "#{split_values[j]}->#{ip[j]}"
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if (ip[j]<0) || (ip[j]>255) then
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puts "'#{value}' is not a valid IP format. (e.g. 192.168.1.64)"
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exit
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end
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end
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packed_option=ip.pack("cccc")
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end
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filebytes[option_offset,option_length]=packed_option
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end
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filehandle=File.open(filename,"wb")
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filehandle<<filebytes
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filehandle.close |