/* 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 source tree.
*/
-
#include <netinet/ether.h>
#include "common.h"
#include "dhcpd.h"
-#include "options.h"
-
/* on these functions, make sure your datatype matches */
-static int read_ip(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 read_mac(const char *line, void *arg)
-{
- uint8_t *mac_bytes = arg;
- struct ether_addr *temp_ether_addr;
-
- temp_ether_addr = ether_aton(line);
- if (temp_ether_addr == NULL)
- return 0;
- memcpy(mac_bytes, temp_ether_addr, 6);
- return 1;
-}
-
-
-static int read_str(const char *line, void *arg)
+static int FAST_FUNC read_str(const char *line, void *arg)
{
char **dest = arg;
return 1;
}
-
-static int read_u32(const char *line, void *arg)
+static int FAST_FUNC read_u32(const char *line, void *arg)
{
*(uint32_t*)arg = bb_strtou32(line, NULL, 10);
return errno == 0;
}
-
-static int read_yn(const char *line, void *arg)
-{
- char *dest = arg;
-
- if (!strcasecmp("yes", line)) {
- *dest = 1;
- return 1;
- }
- if (!strcasecmp("no", line)) {
- *dest = 0;
- return 1;
- }
- return 0;
-}
-
-
-/* find option 'code' in opt_list */
-struct option_set *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 void attach_option(struct option_set **opt_list,
- const struct dhcp_option *option, char *buffer, int length)
-{
- struct option_set *existing, *new, **curr;
-
- existing = find_option(*opt_list, option->code);
- if (!existing) {
- DEBUG("Attaching option %02x to list", option->code);
-
-#if ENABLE_FEATURE_RFC3397
- if ((option->flags & TYPE_MASK) == OPTION_STR1035)
- /* reuse buffer and length for RFC1035-formatted string */
- buffer = dname_enc(NULL, 0, buffer, &length);
-#endif
-
- /* make a new option */
- new = xmalloc(sizeof(*new));
- new->data = xmalloc(length + 2);
- new->data[OPT_CODE] = option->code;
- new->data[OPT_LEN] = length;
- memcpy(new->data + 2, buffer, length);
-
- curr = opt_list;
- while (*curr && (*curr)->data[OPT_CODE] < option->code)
- curr = &(*curr)->next;
-
- new->next = *curr;
- *curr = new;
-#if ENABLE_FEATURE_RFC3397
- if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
- free(buffer);
-#endif
- return;
- }
-
- /* add it to an existing option */
- DEBUG("Attaching option %02x to existing member of list", option->code);
- if (option->flags & OPTION_LIST) {
-#if ENABLE_FEATURE_RFC3397
- if ((option->flags & TYPE_MASK) == OPTION_STR1035)
- /* reuse buffer and length for RFC1035-formatted string */
- buffer = dname_enc(existing->data + 2,
- existing->data[OPT_LEN], buffer, &length);
-#endif
- if (existing->data[OPT_LEN] + length <= 255) {
- existing->data = xrealloc(existing->data,
- existing->data[OPT_LEN] + length + 3);
- if ((option->flags & TYPE_MASK) == OPTION_STRING) {
- /* ' ' can bring us to 256 - bad */
- if (existing->data[OPT_LEN] + length >= 255)
- return;
- /* add space separator between STRING options in a list */
- existing->data[existing->data[OPT_LEN] + 2] = ' ';
- existing->data[OPT_LEN]++;
- }
- memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
- existing->data[OPT_LEN] += length;
- } /* else, ignore the data, we could put this in a second option in the future */
-#if ENABLE_FEATURE_RFC3397
- if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
- free(buffer);
-#endif
- } /* else, ignore the new data */
-}
-
-
-/* read a dhcp option and add it to opt_list */
-static int read_opt(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] __attribute__((aligned(4)));
- uint16_t *result_u16 = (uint16_t *) buffer;
- uint32_t *result_u32 = (uint32_t *) buffer;
-
- /* Cheat, the only const line we'll actually get is "" */
- line = (char *) const_line;
- opt = strtok(line, " \t=");
- if (!opt)
- return 0;
-
- idx = index_in_strings(opt, dhcp_option_strings); /* 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 & TYPE_MASK];
- retval = 0;
- opt = buffer; /* new meaning for variable opt */
- switch (option->flags & TYPE_MASK) {
- case OPTION_IP:
- retval = read_ip(val, buffer);
- break;
- case OPTION_IP_PAIR:
- retval = read_ip(val, buffer);
- val = strtok(NULL, ", \t/-");
- if (!val)
- retval = 0;
- if (retval)
- retval = read_ip(val, buffer + 4);
- break;
- case OPTION_STRING:
-#if ENABLE_FEATURE_RFC3397
- case OPTION_STR1035:
-#endif
- length = strlen(val);
- if (length > 0) {
- if (length > 254) length = 254;
- 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 read_staticlease(const char *const_line, void *arg)
+static int FAST_FUNC read_staticlease(const char *const_line, void *arg)
{
char *line;
char *mac_string;
char *ip_string;
- uint8_t *mac_bytes;
- uint32_t *ip;
-
- /* Allocate memory for addresses */
- mac_bytes = xmalloc(sizeof(unsigned char) * 8);
- ip = xmalloc(sizeof(uint32_t));
+ struct ether_addr mac_bytes; /* it's "struct { uint8_t mac[6]; }" */
+ uint32_t nip;
/* Read mac */
line = (char *) const_line;
- mac_string = strtok(line, " \t");
- read_mac(mac_string, mac_bytes);
+ mac_string = strtok_r(line, " \t", &line);
+ if (!mac_string || !ether_aton_r(mac_string, &mac_bytes))
+ return 0;
/* Read ip */
- ip_string = strtok(NULL, " \t");
- read_ip(ip_string, ip);
+ ip_string = strtok_r(NULL, " \t", &line);
+ if (!ip_string || !udhcp_str2nip(ip_string, &nip))
+ return 0;
- addStaticLease(arg, mac_bytes, ip);
+ add_static_lease(arg, (uint8_t*) &mac_bytes, nip);
- if (ENABLE_FEATURE_UDHCP_DEBUG) printStaticLeases(arg);
+ log_static_leases(arg);
return 1;
}
struct config_keyword {
const char *keyword;
- int (*handler)(const char *line, void *var);
+ int (*handler)(const char *line, void *var) FAST_FUNC;
void *var;
const char *def;
};
static const struct config_keyword keywords[] = {
- /* keyword handler variable address default */
- {"start", read_ip, &(server_config.start_ip), "192.168.0.20"},
- {"end", read_ip, &(server_config.end_ip), "192.168.0.254"},
- {"interface", read_str, &(server_config.interface), "eth0"},
- {"option", read_opt, &(server_config.options), ""},
- {"opt", read_opt, &(server_config.options), ""},
+ /* 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"},
- {"remaining", read_yn, &(server_config.remaining), "yes"},
- {"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), "60"},
- {"lease_file", read_str, &(server_config.lease_file), LEASES_FILE},
- {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
- {"notify_file", read_str, &(server_config.notify_file), ""},
- {"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"},
- {"sname", read_str, &(server_config.sname), ""},
- {"boot_file", read_str, &(server_config.boot_file), ""},
- {"static_lease", read_staticlease, &(server_config.static_leases), ""},
- /* ADDME: static lease */
+ {"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 , 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 };
-
-/*
- * Domain names may have 254 chars, and string options can be 254
- * chars long. However, 80 bytes will be enough for most, and won't
- * hog up memory. If you have a special application, change it
- */
-#define READ_CONFIG_BUF_SIZE 80
-
-int read_config(const char *file)
+void FAST_FUNC read_config(const char *file)
{
- FILE *in;
- char buffer[READ_CONFIG_BUF_SIZE], *token, *line;
- int i, lm = 0;
-
- for (i = 0; i < ARRAY_SIZE(keywords); i++)
- if (keywords[i].def[0])
- keywords[i].handler(keywords[i].def, keywords[i].var);
-
- in = fopen_or_warn(file, "r");
- if (!in) {
- return 0;
- }
-
- while (fgets(buffer, READ_CONFIG_BUF_SIZE, in)) {
- char debug_orig[READ_CONFIG_BUF_SIZE];
-
- lm++;
- *strchrnul(buffer, '\n') = '\0';
- if (ENABLE_FEATURE_UDHCP_DEBUG)
- strcpy(debug_orig, buffer);
- *strchrnul(buffer, '#') = '\0';
-
- token = strtok(buffer, " \t");
- if (!token) continue;
- line = strtok(NULL, "");
- if (!line) continue;
-
- /* eat leading whitespace */
- line = skip_whitespace(line);
- /* eat trailing whitespace */
- i = strlen(line) - 1;
- while (i >= 0 && isspace(line[i]))
- line[i--] = '\0';
-
- for (i = 0; i < ARRAY_SIZE(keywords); i++)
- if (!strcasecmp(token, keywords[i].keyword))
- if (!keywords[i].handler(line, keywords[i].var)) {
- bb_error_msg("cannot parse line %d of %s", lm, file);
- if (ENABLE_FEATURE_UDHCP_DEBUG)
- bb_error_msg("cannot parse '%s'", debug_orig);
+ parser_t *parser;
+ const struct config_keyword *k;
+ unsigned i;
+ char *token[2];
+
+ for (i = 0; i < KWS_WITH_DEFAULTS; i++)
+ keywords[i].handler(keywords[i].def, keywords[i].var);
+
+ parser = config_open(file);
+ while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) {
+ for (k = keywords, i = 0; i < ARRAY_SIZE(keywords); k++, i++) {
+ if (strcasecmp(token[0], k->keyword) == 0) {
+ if (!k->handler(token[1], k->var)) {
+ bb_error_msg("can't parse line %u in %s",
+ parser->lineno, file);
/* reset back to the default value */
- keywords[i].handler(keywords[i].def, keywords[i].var);
+ k->handler(k->def, k->var);
}
+ break;
+ }
+ }
}
- fclose(in);
+ config_close(parser);
server_config.start_ip = ntohl(server_config.start_ip);
server_config.end_ip = ntohl(server_config.end_ip);
-
- return 1;
}
-
-void write_leases(void)
+void FAST_FUNC write_leases(void)
{
- int fp;
+ int fd;
unsigned i;
- time_t curr = time(0);
- unsigned long tmp_time;
+ leasetime_t curr;
+ int64_t written_at;
- fp = open3_or_warn(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC, 0666);
- if (fp < 0) {
+ fd = open_or_warn(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC);
+ if (fd < 0)
return;
- }
+
+ curr = written_at = time(NULL);
+
+ written_at = SWAP_BE64(written_at);
+ full_write(fd, &written_at, sizeof(written_at));
for (i = 0; i < server_config.max_leases; i++) {
- if (leases[i].yiaddr != 0) {
-
- /* screw with the time in the struct, for easier writing */
- tmp_time = leases[i].expires;
-
- if (server_config.remaining) {
- if (lease_expired(&(leases[i])))
- leases[i].expires = 0;
- else leases[i].expires -= curr;
- } /* else stick with the time we got */
- leases[i].expires = htonl(leases[i].expires);
- // FIXME: error check??
- full_write(fp, &leases[i], sizeof(leases[i]));
-
- /* then restore it when done */
- leases[i].expires = tmp_time;
- }
+ leasetime_t tmp_time;
+
+ if (g_leases[i].lease_nip == 0)
+ continue;
+
+ /* Screw with the time in the struct, for easier writing */
+ tmp_time = g_leases[i].expires;
+
+ g_leases[i].expires -= curr;
+ if ((signed_leasetime_t) g_leases[i].expires < 0)
+ g_leases[i].expires = 0;
+ g_leases[i].expires = htonl(g_leases[i].expires);
+
+ /* No error check. If the file gets truncated,
+ * we lose some leases on restart. Oh well. */
+ full_write(fd, &g_leases[i], sizeof(g_leases[i]));
+
+ /* Then restore it when done */
+ g_leases[i].expires = tmp_time;
}
- close(fp);
+ close(fd);
if (server_config.notify_file) {
- 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);
}
}
-
-void read_leases(const char *file)
+void FAST_FUNC read_leases(const char *file)
{
- int fp;
- unsigned int i = 0;
- struct dhcpOfferedAddr lease;
+ struct dyn_lease lease;
+ int64_t written_at, time_passed;
+ int fd;
+#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
+ unsigned i = 0;
+#endif
- fp = open_or_warn(file, O_RDONLY);
- if (fp < 0) {
+ fd = open_or_warn(file, O_RDONLY);
+ if (fd < 0)
return;
- }
- while (i < server_config.max_leases
- && full_read(fp, &lease, sizeof(lease)) == sizeof(lease)
- ) {
- /* ADDME: is it a static lease */
- uint32_t y = ntohl(lease.yiaddr);
+ if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at))
+ goto ret;
+ written_at = SWAP_BE64(written_at);
+
+ time_passed = time(NULL) - written_at;
+ /* Strange written_at, or lease file from old version of udhcpd
+ * which had no "written_at" field? */
+ if ((uint64_t)time_passed > 12 * 60 * 60)
+ goto ret;
+
+ while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
+//FIXME: what if it matches some static lease?
+ uint32_t y = ntohl(lease.lease_nip);
if (y >= server_config.start_ip && y <= server_config.end_ip) {
- lease.expires = ntohl(lease.expires);
- if (!server_config.remaining)
- lease.expires -= time(0);
- if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
+ signed_leasetime_t expires = ntohl(lease.expires) - (signed_leasetime_t)time_passed;
+ if (expires <= 0)
+ continue;
+ /* NB: add_lease takes "relative time", IOW,
+ * lease duration, not lease deadline. */
+ if (add_lease(lease.lease_mac, lease.lease_nip,
+ expires,
+ lease.hostname, sizeof(lease.hostname)
+ ) == 0
+ ) {
bb_error_msg("too many leases while loading %s", file);
break;
}
+#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
i++;
+#endif
}
}
- DEBUG("Read %d leases", i);
- close(fp);
+ log1("Read %d leases", i);
+ ret:
+ close(fd);
}
projects / oweals / busybox.git / blobdiff