2 * MAC address manupulation utility
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
19 #define MAC_ADDRESS_LEN 6
24 static void usage(void);
28 static int parse_mac(const char *mac_str
, unsigned char *buf
)
32 t
= sscanf(mac_str
, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
33 &buf
[0], &buf
[1], &buf
[2], &buf
[3], &buf
[4], &buf
[5]);
35 if (t
!= MAC_ADDRESS_LEN
)
41 static void print_mac(unsigned char *buf
)
43 printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
44 buf
[0], buf
[1], buf
[2], buf
[3], buf
[4], buf
[5]);
47 static int maccalc_do_add(int argc
, const char *argv
[])
49 unsigned char mac
[MAC_ADDRESS_LEN
];
59 err
= parse_mac(argv
[0], mac
);
65 t
= (mac
[3] << 16) | (mac
[4] << 8) | mac
[5];
67 mac
[3] = (t
>> 16) & 0xff;
68 mac
[4] = (t
>> 8) & 0xff;
75 static int maccalc_do_logical(int argc
, const char *argv
[],
76 unsigned char (*op
)(unsigned char n1
,
79 unsigned char mac1
[MAC_ADDRESS_LEN
];
80 unsigned char mac2
[MAC_ADDRESS_LEN
];
89 err
= parse_mac(argv
[0], mac1
);
93 err
= parse_mac(argv
[1], mac2
);
97 for (i
= 0; i
< MAC_ADDRESS_LEN
; i
++)
98 mac1
[i
] = op(mac1
[i
],mac2
[i
]);
104 static int maccalc_do_mac2bin(int argc
, const char *argv
[])
106 unsigned char mac
[MAC_ADDRESS_LEN
];
115 err
= parse_mac(argv
[0], mac
);
119 c
= write(STDOUT_FILENO
, mac
, sizeof(mac
));
120 if (c
!= sizeof(mac
)) {
121 fprintf(stderr
, "failed to write to stdout\n");
128 static ssize_t
read_safe(int fd
, void *buf
, size_t count
)
134 r
= read(fd
, buf
, count
);
140 /* interrupted by a signal, restart */
156 static int maccalc_do_bin2mac(int argc
, const char *argv
[])
158 unsigned char mac
[MAC_ADDRESS_LEN
];
166 c
= read_safe(STDIN_FILENO
, mac
, sizeof(mac
));
167 if (c
!= sizeof(mac
)) {
168 fprintf(stderr
, "failed to read from stdin\n");
176 static unsigned char op_or(unsigned char n1
, unsigned char n2
)
181 static int maccalc_do_or(int argc
, const char *argv
[])
183 return maccalc_do_logical(argc
, argv
, op_or
);
186 static unsigned char op_and(unsigned char n1
, unsigned char n2
)
191 static int maccalc_do_and(int argc
, const char *argv
[])
193 return maccalc_do_logical(argc
, argv
, op_and
);
196 static unsigned char op_xor(unsigned char n1
, unsigned char n2
)
201 static int maccalc_do_xor(int argc
, const char *argv
[])
203 return maccalc_do_logical(argc
, argv
, op_xor
);
206 static void usage(void)
209 "Usage: %s <command>\n"
211 " add <mac> <number>\n"
212 " and|or|xor <mac1> <mac2>\n"
218 int main(int argc
, const char *argv
[])
220 int (*op
)(int argc
, const char *argv
[]);
223 maccalc_name
= (char *) argv
[0];
230 if (strcmp(argv
[1], "add") == 0) {
232 } else if (strcmp(argv
[1], "and") == 0) {
234 } else if (strcmp(argv
[1], "or") == 0) {
236 } else if (strcmp(argv
[1], "xor") == 0) {
238 } else if (strcmp(argv
[1], "mac2bin") == 0) {
239 op
= maccalc_do_mac2bin
;
240 } else if (strcmp(argv
[1], "bin2mac") == 0) {
241 op
= maccalc_do_bin2mac
;
243 fprintf(stderr
, "unknown command '%s'\n", argv
[1]);
251 ret
= op(argc
, argv
);
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