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427 lines
11 KiB
C
427 lines
11 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* files.c -- DHCP server file manipulation *
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* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
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*/
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#include <netinet/ether.h>
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#include "common.h"
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#include "dhcpd.h"
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#include "options.h"
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/*
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* Domain names may have 254 chars, and string options can be 254
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* chars long. However, 80 bytes will be enough for most, and won't
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* hog up memory. If you have a special application, change it
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*/
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#define READ_CONFIG_BUF_SIZE 80
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/* on these functions, make sure you datatype matches */
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static int read_ip(const char *line, void *arg)
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{
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len_and_sockaddr *lsa;
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int retval = 0;
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lsa = host_and_af2sockaddr(line, 0, AF_INET);
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if (lsa) {
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*(struct in_addr*)arg = lsa->sin.sin_addr;
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free(lsa);
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retval = 1;
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}
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return retval;
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}
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static int read_mac(const char *line, void *arg)
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{
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uint8_t *mac_bytes = arg;
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struct ether_addr *temp_ether_addr;
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int retval = 1;
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temp_ether_addr = ether_aton(line);
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if (temp_ether_addr == NULL)
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retval = 0;
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else
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memcpy(mac_bytes, temp_ether_addr, 6);
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return retval;
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}
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static int read_str(const char *line, void *arg)
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{
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char **dest = arg;
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free(*dest);
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*dest = xstrdup(line);
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return 1;
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}
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static int read_u32(const char *line, void *arg)
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{
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*((uint32_t*)arg) = bb_strtou32(line, NULL, 10);
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return errno == 0;
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}
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static int read_yn(const char *line, void *arg)
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{
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char *dest = arg;
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int retval = 1;
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if (!strcasecmp("yes", line))
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*dest = 1;
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else if (!strcasecmp("no", line))
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*dest = 0;
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else retval = 0;
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return retval;
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}
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/* find option 'code' in opt_list */
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struct option_set *find_option(struct option_set *opt_list, char code)
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{
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while (opt_list && opt_list->data[OPT_CODE] < code)
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opt_list = opt_list->next;
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if (opt_list && opt_list->data[OPT_CODE] == code) return opt_list;
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else return NULL;
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}
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/* add an option to the opt_list */
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static void attach_option(struct option_set **opt_list,
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const struct dhcp_option *option, char *buffer, int length)
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{
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struct option_set *existing, *new, **curr;
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existing = find_option(*opt_list, option->code);
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if (!existing) {
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DEBUG("Attaching option %s to list", option->name);
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#if ENABLE_FEATURE_RFC3397
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if ((option->flags & TYPE_MASK) == OPTION_STR1035)
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/* reuse buffer and length for RFC1035-formatted string */
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buffer = dname_enc(NULL, 0, buffer, &length);
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#endif
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/* make a new option */
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new = xmalloc(sizeof(struct option_set));
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new->data = xmalloc(length + 2);
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new->data[OPT_CODE] = option->code;
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new->data[OPT_LEN] = length;
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memcpy(new->data + 2, buffer, length);
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curr = opt_list;
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while (*curr && (*curr)->data[OPT_CODE] < option->code)
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curr = &(*curr)->next;
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new->next = *curr;
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*curr = new;
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#if ENABLE_FEATURE_RFC3397
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if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
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free(buffer);
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#endif
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return;
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}
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/* add it to an existing option */
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DEBUG("Attaching option %s to existing member of list", option->name);
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if (option->flags & OPTION_LIST) {
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#if ENABLE_FEATURE_RFC3397
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if ((option->flags & TYPE_MASK) == OPTION_STR1035)
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/* reuse buffer and length for RFC1035-formatted string */
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buffer = dname_enc(existing->data + 2,
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existing->data[OPT_LEN], buffer, &length);
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#endif
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if (existing->data[OPT_LEN] + length <= 255) {
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existing->data = xrealloc(existing->data,
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existing->data[OPT_LEN] + length + 3);
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if ((option->flags & TYPE_MASK) == OPTION_STRING) {
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/* ' ' can bring us to 256 - bad */
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if (existing->data[OPT_LEN] + length >= 255)
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return;
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/* add space separator between STRING options in a list */
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existing->data[existing->data[OPT_LEN] + 2] = ' ';
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existing->data[OPT_LEN]++;
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}
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memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
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existing->data[OPT_LEN] += length;
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} /* else, ignore the data, we could put this in a second option in the future */
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#if ENABLE_FEATURE_RFC3397
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if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
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free(buffer);
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#endif
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} /* else, ignore the new data */
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}
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/* read a dhcp option and add it to opt_list */
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static int read_opt(const char *const_line, void *arg)
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{
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struct option_set **opt_list = arg;
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char *opt, *val, *endptr;
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const struct dhcp_option *option;
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int retval = 0, length;
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char buffer[8];
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char *line;
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uint16_t *result_u16 = (uint16_t *) buffer;
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uint32_t *result_u32 = (uint32_t *) buffer;
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/* Cheat, the only const line we'll actually get is "" */
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line = (char *) const_line;
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opt = strtok(line, " \t=");
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if (!opt) return 0;
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option = dhcp_options;
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while (1) {
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if (!option->code)
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return 0;
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if (!strcasecmp(option->name, opt))
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break;
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option++;
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}
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do {
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val = strtok(NULL, ", \t");
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if (!val) break;
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length = option_lengths[option->flags & TYPE_MASK];
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retval = 0;
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opt = buffer; /* new meaning for variable opt */
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switch (option->flags & TYPE_MASK) {
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case OPTION_IP:
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retval = read_ip(val, buffer);
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break;
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case OPTION_IP_PAIR:
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retval = read_ip(val, buffer);
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if (!(val = strtok(NULL, ", \t/-"))) retval = 0;
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if (retval) retval = read_ip(val, buffer + 4);
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break;
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case OPTION_STRING:
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#if ENABLE_FEATURE_RFC3397
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case OPTION_STR1035:
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#endif
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length = strlen(val);
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if (length > 0) {
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if (length > 254) length = 254;
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opt = val;
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retval = 1;
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}
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break;
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case OPTION_BOOLEAN:
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retval = read_yn(val, buffer);
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break;
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case OPTION_U8:
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buffer[0] = strtoul(val, &endptr, 0);
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retval = (endptr[0] == '\0');
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break;
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case OPTION_U16:
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*result_u16 = htons(strtoul(val, &endptr, 0));
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retval = (endptr[0] == '\0');
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break;
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case OPTION_S16:
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*result_u16 = htons(strtol(val, &endptr, 0));
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retval = (endptr[0] == '\0');
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break;
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case OPTION_U32:
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*result_u32 = htonl(strtoul(val, &endptr, 0));
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retval = (endptr[0] == '\0');
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break;
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case OPTION_S32:
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*result_u32 = htonl(strtol(val, &endptr, 0));
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retval = (endptr[0] == '\0');
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break;
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default:
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break;
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}
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if (retval)
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attach_option(opt_list, option, opt, length);
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} while (retval && option->flags & OPTION_LIST);
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return retval;
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}
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static int read_staticlease(const char *const_line, void *arg)
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{
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char *line;
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char *mac_string;
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char *ip_string;
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uint8_t *mac_bytes;
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uint32_t *ip;
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/* Allocate memory for addresses */
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mac_bytes = xmalloc(sizeof(unsigned char) * 8);
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ip = xmalloc(sizeof(uint32_t));
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/* Read mac */
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line = (char *) const_line;
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mac_string = strtok(line, " \t");
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read_mac(mac_string, mac_bytes);
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/* Read ip */
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ip_string = strtok(NULL, " \t");
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read_ip(ip_string, ip);
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addStaticLease(arg, mac_bytes, ip);
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if (ENABLE_FEATURE_UDHCP_DEBUG) printStaticLeases(arg);
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return 1;
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}
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static const struct config_keyword keywords[] = {
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/* keyword handler variable address default */
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{"start", read_ip, &(server_config.start), "192.168.0.20"},
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{"end", read_ip, &(server_config.end), "192.168.0.254"},
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{"interface", read_str, &(server_config.interface), "eth0"},
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{"option", read_opt, &(server_config.options), ""},
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{"opt", read_opt, &(server_config.options), ""},
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{"max_leases", read_u32, &(server_config.max_leases), "254"},
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{"remaining", read_yn, &(server_config.remaining), "yes"},
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{"auto_time", read_u32, &(server_config.auto_time), "7200"},
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{"decline_time",read_u32, &(server_config.decline_time),"3600"},
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{"conflict_time",read_u32,&(server_config.conflict_time),"3600"},
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{"offer_time", read_u32, &(server_config.offer_time), "60"},
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{"min_lease", read_u32, &(server_config.min_lease), "60"},
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{"lease_file", read_str, &(server_config.lease_file), LEASES_FILE},
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{"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
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{"notify_file", read_str, &(server_config.notify_file), ""},
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{"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"},
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{"sname", read_str, &(server_config.sname), ""},
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{"boot_file", read_str, &(server_config.boot_file), ""},
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{"static_lease",read_staticlease, &(server_config.static_leases), ""},
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/*ADDME: static lease */
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{"", NULL, NULL, ""}
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};
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int read_config(const char *file)
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{
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FILE *in;
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char buffer[READ_CONFIG_BUF_SIZE], *token, *line;
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int i, lm = 0;
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for (i = 0; keywords[i].keyword[0]; i++)
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if (keywords[i].def[0])
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keywords[i].handler(keywords[i].def, keywords[i].var);
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in = fopen(file, "r");
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if (!in) {
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bb_error_msg("cannot open config file: %s", file);
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return 0;
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}
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while (fgets(buffer, READ_CONFIG_BUF_SIZE, in)) {
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char debug_orig[READ_CONFIG_BUF_SIZE];
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char *p;
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lm++;
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p = strchr(buffer, '\n');
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if (p) *p = '\0';
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if (ENABLE_FEATURE_UDHCP_DEBUG) strcpy(debug_orig, buffer);
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p = strchr(buffer, '#');
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if (p) *p = '\0';
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if (!(token = strtok(buffer, " \t"))) continue;
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if (!(line = strtok(NULL, ""))) continue;
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/* eat leading whitespace */
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line = skip_whitespace(line);
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/* eat trailing whitespace */
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i = strlen(line) - 1;
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while (i >= 0 && isspace(line[i]))
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line[i--] = '\0';
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for (i = 0; keywords[i].keyword[0]; i++)
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if (!strcasecmp(token, keywords[i].keyword))
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if (!keywords[i].handler(line, keywords[i].var)) {
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bb_error_msg("cannot parse line %d of %s", lm, file);
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if (ENABLE_FEATURE_UDHCP_DEBUG)
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bb_error_msg("cannot parse '%s'", debug_orig);
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/* reset back to the default value */
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keywords[i].handler(keywords[i].def, keywords[i].var);
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}
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}
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fclose(in);
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return 1;
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}
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void write_leases(void)
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{
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int fp;
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unsigned i;
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time_t curr = time(0);
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unsigned long tmp_time;
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fp = open(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC, 0666);
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if (fp < 0) {
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bb_error_msg("cannot open %s for writing", server_config.lease_file);
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return;
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}
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for (i = 0; i < server_config.max_leases; i++) {
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if (leases[i].yiaddr != 0) {
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/* screw with the time in the struct, for easier writing */
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tmp_time = leases[i].expires;
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if (server_config.remaining) {
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if (lease_expired(&(leases[i])))
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leases[i].expires = 0;
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else leases[i].expires -= curr;
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} /* else stick with the time we got */
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leases[i].expires = htonl(leases[i].expires);
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// FIXME: error check??
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full_write(fp, &leases[i], sizeof(leases[i]));
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/* then restore it when done */
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leases[i].expires = tmp_time;
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}
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}
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close(fp);
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if (server_config.notify_file) {
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char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
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system(cmd);
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free(cmd);
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}
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}
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void read_leases(const char *file)
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{
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int fp;
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unsigned int i = 0;
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struct dhcpOfferedAddr lease;
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fp = open(file, O_RDONLY);
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if (fp < 0) {
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bb_error_msg("cannot open %s for reading", file);
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return;
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}
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while (i < server_config.max_leases
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&& full_read(fp, &lease, sizeof(lease)) == sizeof(lease)
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) {
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/* ADDME: is it a static lease */
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if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
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lease.expires = ntohl(lease.expires);
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if (!server_config.remaining) lease.expires -= time(0);
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if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
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bb_error_msg("too many leases while loading %s", file);
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break;
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}
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i++;
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}
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}
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DEBUG("Read %d leases", i);
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close(fp);
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}
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