diff options
| -rw-r--r-- | networking/udhcp/dhcpc.c | 57 |
1 files changed, 47 insertions, 10 deletions
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index ca82d37..510c3a1 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -300,6 +300,14 @@ static char **fill_envp(struct dhcp_packet *packet) uint8_t *temp; uint8_t overload = 0; +#define BITMAP unsigned +#define BBITS (sizeof(BITMAP) * 8) +#define BMASK(i) (1 << (i & (sizeof(BITMAP) * 8 - 1))) +#define FOUND_OPTS(i) (found_opts[(unsigned)i / BBITS]) + BITMAP found_opts[256 / BBITS]; + + memset(found_opts, 0, sizeof(found_opts)); + /* We need 6 elements for: * "interface=IFACE" * "ip=N.N.N.N" from packet->yiaddr @@ -311,18 +319,21 @@ static char **fill_envp(struct dhcp_packet *packet) envc = 6; /* +1 element for each option, +2 for subnet option: */ if (packet) { - for (i = 0; dhcp_optflags[i].code; i++) { - if (udhcp_get_option(packet, dhcp_optflags[i].code)) { - if (dhcp_optflags[i].code == DHCP_SUBNET) + /* note: do not search for "pad" (0) and "end" (255) options */ + for (i = 1; i < 255; i++) { + temp = udhcp_get_option(packet, i); + if (temp) { + if (i == DHCP_OPTION_OVERLOAD) + overload = *temp; + else if (i == DHCP_SUBNET) envc++; /* for mton */ envc++; + /*if (i != DHCP_MESSAGE_TYPE)*/ + FOUND_OPTS(i) |= BMASK(i); } } - temp = udhcp_get_option(packet, DHCP_OPTION_OVERLOAD); - if (temp) - overload = *temp; } - curr = envp = xzalloc(sizeof(char *) * envc); + curr = envp = xzalloc(sizeof(envp[0]) * envc); *curr = xasprintf("interface=%s", client_config.interface); putenv(*curr++); @@ -337,12 +348,16 @@ static char **fill_envp(struct dhcp_packet *packet) opt_name = dhcp_option_strings; i = 0; while (*opt_name) { - temp = udhcp_get_option(packet, dhcp_optflags[i].code); - if (!temp) + uint8_t code = dhcp_optflags[i].code; + BITMAP *found_ptr = &FOUND_OPTS(code); + BITMAP found_mask = BMASK(code); + if (!(*found_ptr & found_mask)) goto next; + *found_ptr &= ~found_mask; /* leave only unknown options */ + temp = udhcp_get_option(packet, code); *curr = xmalloc_optname_optval(temp, &dhcp_optflags[i], opt_name); putenv(*curr++); - if (dhcp_optflags[i].code == DHCP_SUBNET) { + if (code == DHCP_SUBNET) { /* Subnet option: make things like "$ip/$mask" possible */ uint32_t subnet; move_from_unaligned32(subnet, temp); @@ -368,6 +383,28 @@ static char **fill_envp(struct dhcp_packet *packet) *curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname); putenv(*curr++); } + /* Handle unknown options */ + for (i = 0; i < 256;) { + BITMAP bitmap = FOUND_OPTS(i); + if (!bitmap) { + i += BBITS; + continue; + } + if (bitmap & BMASK(i)) { + unsigned len, ofs; + + temp = udhcp_get_option(packet, i); + /* udhcp_get_option returns ptr to data portion, + * need to go back to get len + */ + len = temp[-OPT_DATA + OPT_LEN]; + *curr = xmalloc(sizeof("optNNN=") + 1 + len*2); + ofs = sprintf(*curr, "opt%u=", i); + bin2hex(*curr + ofs, (void*) temp, len)[0] = '\0'; + putenv(*curr++); + } + i++; + } return envp; } |