/* vi: set sw=4 ts=4: */
/*
- * files.c -- DHCP server file manipulation *
+ * DHCP server config and lease file manipulation
+ *
* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
*
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-
#include <netinet/ether.h>
#include "common.h"
#include "dhcpd.h"
-#if BB_LITTLE_ENDIAN
-static inline uint64_t hton64(uint64_t v)
-{
- return (((uint64_t)htonl(v)) << 32) | htonl(v >> 32);
-}
-#else
-#define hton64(v) (v)
-#endif
-#define ntoh64(v) hton64(v)
-
/* on these functions, make sure your datatype matches */
-static int FAST_FUNC read_nip(const char *line, void *arg)
-{
- len_and_sockaddr *lsa;
-
- lsa = host_and_af2sockaddr(line, 0, AF_INET);
- if (!lsa)
- return 0;
- *(uint32_t*)arg = lsa->u.sin.sin_addr.s_addr;
- free(lsa);
- return 1;
-}
-
static int FAST_FUNC read_str(const char *line, void *arg)
{
char **dest = arg;
return errno == 0;
}
-static int read_yn(const char *line, void *arg)
-{
- char *dest = arg;
-
- if (strcasecmp("yes", line) == 0) {
- *dest = 1;
- return 1;
- }
- if (strcasecmp("no", line) == 0) {
- *dest = 0;
- return 1;
- }
- return 0;
-}
-
-/* find option 'code' in opt_list */
-struct option_set* FAST_FUNC find_option(struct option_set *opt_list, uint8_t code)
-{
- while (opt_list && opt_list->data[OPT_CODE] < code)
- opt_list = opt_list->next;
-
- if (opt_list && opt_list->data[OPT_CODE] == code)
- return opt_list;
- return NULL;
-}
-
-/* add an option to the opt_list */
-static NOINLINE void attach_option(
- struct option_set **opt_list,
- const struct dhcp_option *option,
- char *buffer,
- int length)
-{
- struct option_set *existing, *new, **curr;
-#if ENABLE_FEATURE_UDHCP_RFC3397
- char *allocated = NULL;
-#endif
-
- existing = find_option(*opt_list, option->code);
- if (!existing) {
- log2("Attaching option %02x to list", option->code);
-#if ENABLE_FEATURE_UDHCP_RFC3397
- if ((option->flags & OPTION_TYPE_MASK) == OPTION_STR1035) {
- /* reuse buffer and length for RFC1035-formatted string */
- allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
- }
-#endif
- /* make a new option */
- new = xmalloc(sizeof(*new));
- new->data = xmalloc(length + OPT_DATA);
- new->data[OPT_CODE] = option->code;
- new->data[OPT_LEN] = length;
- memcpy(new->data + OPT_DATA, buffer, length);
-
- curr = opt_list;
- while (*curr && (*curr)->data[OPT_CODE] < option->code)
- curr = &(*curr)->next;
-
- new->next = *curr;
- *curr = new;
- goto ret;
- }
-
- if (option->flags & OPTION_LIST) {
- unsigned old_len;
-
- /* add it to an existing option */
- log1("Attaching option %02x to existing member of list", option->code);
- old_len = existing->data[OPT_LEN];
-#if ENABLE_FEATURE_UDHCP_RFC3397
- if ((option->flags & OPTION_TYPE_MASK) == OPTION_STR1035) {
- /* reuse buffer and length for RFC1035-formatted string */
- allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
- }
-#endif
- if (old_len + length < 255) {
- /* actually 255 is ok too, but adding a space can overlow it */
-
- existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
- if ((option->flags & OPTION_TYPE_MASK) == OPTION_STRING) {
- /* add space separator between STRING options in a list */
- existing->data[OPT_DATA + old_len] = ' ';
- old_len++;
- }
- memcpy(existing->data + OPT_DATA + old_len, buffer, length);
- existing->data[OPT_LEN] = old_len + length;
- } /* else, ignore the data, we could put this in a second option in the future */
- } /* else, ignore the new data */
-
- ret: ;
-#if ENABLE_FEATURE_UDHCP_RFC3397
- free(allocated);
-#endif
-}
-
-/* read a dhcp option and add it to opt_list */
-int FAST_FUNC udhcp_str2optset(const char *const_line, void *arg)
-{
- struct option_set **opt_list = arg;
- char *opt, *val, *endptr;
- char *line;
- const struct dhcp_option *option;
- int retval, length, idx;
- char buffer[8] ALIGNED(4);
- uint16_t *result_u16 = (uint16_t *) buffer;
- uint32_t *result_u32 = (uint32_t *) buffer;
-
- /* Cheat, the only *const* line possible is "" */
- line = (char *) const_line;
- opt = strtok(line, " \t=");
- if (!opt)
- return 0;
-
- idx = index_in_strings(dhcp_option_strings, opt); /* NB: was strcasecmp! */
- if (idx < 0)
- return 0;
- option = &dhcp_options[idx];
-
- retval = 0;
- do {
- val = strtok(NULL, ", \t");
- if (!val)
- break;
- length = dhcp_option_lengths[option->flags & OPTION_TYPE_MASK];
- retval = 0;
- opt = buffer; /* new meaning for variable opt */
- switch (option->flags & OPTION_TYPE_MASK) {
- case OPTION_IP:
- retval = read_nip(val, buffer);
- break;
- case OPTION_IP_PAIR:
- retval = read_nip(val, buffer);
- val = strtok(NULL, ", \t/-");
- if (!val)
- retval = 0;
- if (retval)
- retval = read_nip(val, buffer + 4);
- break;
- case OPTION_STRING:
-#if ENABLE_FEATURE_UDHCP_RFC3397
- case OPTION_STR1035:
-#endif
- length = strnlen(val, 254);
- if (length > 0) {
- opt = val;
- retval = 1;
- }
- break;
- case OPTION_BOOLEAN:
- retval = read_yn(val, buffer);
- break;
- case OPTION_U8:
- buffer[0] = strtoul(val, &endptr, 0);
- retval = (endptr[0] == '\0');
- break;
- /* htonX are macros in older libc's, using temp var
- * in code below for safety */
- /* TODO: use bb_strtoX? */
- case OPTION_U16: {
- unsigned long tmp = strtoul(val, &endptr, 0);
- *result_u16 = htons(tmp);
- retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
- break;
- }
- case OPTION_S16: {
- long tmp = strtol(val, &endptr, 0);
- *result_u16 = htons(tmp);
- retval = (endptr[0] == '\0');
- break;
- }
- case OPTION_U32: {
- unsigned long tmp = strtoul(val, &endptr, 0);
- *result_u32 = htonl(tmp);
- retval = (endptr[0] == '\0');
- break;
- }
- case OPTION_S32: {
- long tmp = strtol(val, &endptr, 0);
- *result_u32 = htonl(tmp);
- retval = (endptr[0] == '\0');
- break;
- }
- default:
- break;
- }
- if (retval)
- attach_option(opt_list, option, opt, length);
- } while (retval && option->flags & OPTION_LIST);
-
- return retval;
-}
-
static int FAST_FUNC read_staticlease(const char *const_line, void *arg)
{
char *line;
/* Read ip */
ip_string = strtok_r(NULL, " \t", &line);
- if (!ip_string || !read_nip(ip_string, &nip))
+ if (!ip_string || !udhcp_str2nip(ip_string, &nip))
return 0;
add_static_lease(arg, (uint8_t*) &mac_bytes, nip);
};
static const struct config_keyword keywords[] = {
- /* keyword handler variable address default */
- {"start", read_nip, &(server_config.start_ip), "192.168.0.20"},
- {"end", read_nip, &(server_config.end_ip), "192.168.0.254"},
- {"interface", read_str, &(server_config.interface), "eth0"},
+ /* keyword handler variable address default */
+ {"start" , udhcp_str2nip , &server_config.start_ip , "192.168.0.20"},
+ {"end" , udhcp_str2nip , &server_config.end_ip , "192.168.0.254"},
+ {"interface" , read_str , &server_config.interface , "eth0"},
/* Avoid "max_leases value not sane" warning by setting default
* to default_end_ip - default_start_ip + 1: */
- {"max_leases", read_u32, &(server_config.max_leases), "235"},
- {"auto_time", read_u32, &(server_config.auto_time), "7200"},
- {"decline_time", read_u32, &(server_config.decline_time), "3600"},
- {"conflict_time",read_u32, &(server_config.conflict_time),"3600"},
- {"offer_time", read_u32, &(server_config.offer_time), "60"},
- {"min_lease", read_u32, &(server_config.min_lease_sec),"60"},
- {"lease_file", read_str, &(server_config.lease_file), LEASES_FILE},
- {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
- {"siaddr", read_nip, &(server_config.siaddr_nip), "0.0.0.0"},
+ {"max_leases" , read_u32 , &server_config.max_leases , "235"},
+ {"auto_time" , read_u32 , &server_config.auto_time , "7200"},
+ {"decline_time" , read_u32 , &server_config.decline_time , "3600"},
+ {"conflict_time", read_u32 , &server_config.conflict_time, "3600"},
+ {"offer_time" , read_u32 , &server_config.offer_time , "60"},
+ {"min_lease" , read_u32 , &server_config.min_lease_sec, "60"},
+ {"lease_file" , read_str , &server_config.lease_file , LEASES_FILE},
+ {"pidfile" , read_str , &server_config.pidfile , "/var/run/udhcpd.pid"},
+ {"siaddr" , udhcp_str2nip , &server_config.siaddr_nip , "0.0.0.0"},
/* keywords with no defaults must be last! */
- {"option", udhcp_str2optset, &(server_config.options), ""},
- {"opt", udhcp_str2optset, &(server_config.options), ""},
- {"notify_file", read_str, &(server_config.notify_file), ""},
- {"sname", read_str, &(server_config.sname), ""},
- {"boot_file", read_str, &(server_config.boot_file), ""},
- {"static_lease", read_staticlease, &(server_config.static_leases), ""},
+ {"option" , udhcp_str2optset, &server_config.options , ""},
+ {"opt" , udhcp_str2optset, &server_config.options , ""},
+ {"notify_file" , read_str , &server_config.notify_file , NULL},
+ {"sname" , read_str , &server_config.sname , NULL},
+ {"boot_file" , read_str , &server_config.boot_file , NULL},
+ {"static_lease" , read_staticlease, &server_config.static_leases, ""},
};
enum { KWS_WITH_DEFAULTS = ARRAY_SIZE(keywords) - 6 };
curr = written_at = time(NULL);
- written_at = hton64(written_at);
+ written_at = SWAP_BE64(written_at);
full_write(fd, &written_at, sizeof(written_at));
for (i = 0; i < server_config.max_leases; i++) {
close(fd);
if (server_config.notify_file) {
-// TODO: vfork-based child creation
- char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
- system(cmd);
- free(cmd);
+ char *argv[3];
+ argv[0] = server_config.notify_file;
+ argv[1] = server_config.lease_file;
+ argv[2] = NULL;
+ spawn_and_wait(argv);
}
}
if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at))
goto ret;
- written_at = ntoh64(written_at);
+ written_at = SWAP_BE64(written_at);
time_passed = time(NULL) - written_at;
/* Strange written_at, or lease file from old version of udhcpd
projects / oweals / busybox.git / blobdiff