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tunemu: added device name check

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This commit is contained in:
Friedrich Schöller 2009-08-03 16:28:56 +02:00
parent 9147b7f015
commit 207f93a795
1 changed files with 30 additions and 9 deletions
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39
tunemu.c
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@ -264,21 +264,42 @@ static void allocate_data_buffer(int size)
}
}
static void make_device_name(tunemu_device device, int unit_number)
{
snprintf(device, sizeof(tunemu_device), "ppp%d", unit_number);
}
static int check_device_name(tunemu_device device)
{
if (strlen(device) < 4)
return -1;
int unit_number = atoi(device + 3);
if (unit_number < 0 || unit_number > 999)
return -1;
tunemu_device compare;
make_device_name(compare, unit_number);
if (strcmp(device, compare) != 0)
return -1;
return 0;
}
int tunemu_open(tunemu_device device)
{
int ppp_unit_number = -1;
char *c = device;
while (*c)
if (device[0] != 0)
{
if (isdigit(*c))
if (check_device_name(device) < 0)
{
ppp_unit_number = atoi(c);
break;
tun_error("invalid device name \"%s\"", device);
return -1;
}
c++;
ppp_unit_number = atoi(device + 3);
}
if (ppp_unit_number > 999)
ppp_unit_number = -1;
int ppp_unit_fd = ppp_new_unit(&ppp_unit_number);
if (ppp_unit_fd < 0)
@ -296,7 +317,7 @@ int tunemu_open(tunemu_device device)
return -1;
}
snprintf(device, sizeof(tunemu_device), "ppp%d", ppp_unit_number);
make_device_name(device, ppp_unit_number);
return ppp_unit_fd;
}