Ganbold wrote:
Hi,
What does following part of src/sbin/ipfw/ipfw2.c code?
...
static void
fill_ip(ipfw_insn_ip *cmd, char *av)
{
int len = 0;
uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
cmd->o.len &= ~F_LEN_MASK; /* zero len */
-----------------------------------
if (strncmp(av, "table(", 6) == 0) {
match the beginning of the "table(entry,value)"
char *p = strchr(av + 6, ',');
find the ',' if any
if (p)
*p++ = '\0';
and replace it with '\0' eq "table(entry\0value)" so as a string it is
now "table(entry"
and make p point to 'value', eq p = 'value' now
cmd->o.opcode = O_IP_DST_LOOKUP;
cmd->o.arg1 = strtoul(av + 6, NULL, 0);
av+6 is the "entry" string
arg1=(unsigned long)entry
if (p) {
if we have a 'value ' part
cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
d[0] = strtoul(p, NULL, 0);
d[0] = (unsigned long)value
} else
cmd->o.len |= F_INSN_SIZE(ipfw_insn);
return;
}
Is that what you need?
rik
-----------------------------------
Specially, what does following code?
...
cmd->o.opcode = O_IP_DST_LOOKUP;
cmd->o.arg1 = strtoul(av + 6, NULL, 0);
if (p) {
cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
d[0] = strtoul(p, NULL, 0);
} else
cmd->o.len |= F_INSN_SIZE(ipfw_insn);
...
thanks,
Ganbold
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