+/* vi: set sw=4 ts=4: */
/*
* files.c -- DHCP server file manipulation *
* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
*/
-#include <sys/socket.h>
-#include <arpa/inet.h>
-#include <string.h>
-#include <stdlib.h>
-#include <time.h>
-#include <ctype.h>
-#include <netdb.h>
+#include <netinet/ether.h>
+#include "common.h"
#include "dhcpd.h"
-#include "files.h"
#include "options.h"
-#include "common.h"
-/*
- * 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
-/* on these functions, make sure you datatype matches */
+/* on these functions, make sure your datatype matches */
static int read_ip(const char *line, void *arg)
{
- struct in_addr *addr = arg;
- struct hostent *host;
- int retval = 1;
-
- if (!inet_aton(line, addr)) {
- if ((host = gethostbyname(line)))
- addr->s_addr = *((unsigned long *) host->h_addr_list[0]);
- else retval = 0;
- }
- return retval;
+ 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;
}
{
char **dest = arg;
- if (*dest) free(*dest);
- *dest = strdup(line);
-
+ free(*dest);
+ *dest = xstrdup(line);
return 1;
}
static int read_u32(const char *line, void *arg)
{
- uint32_t *dest = arg;
- char *endptr;
- *dest = strtoul(line, &endptr, 0);
- return endptr[0] == '\0';
+ *(uint32_t*)arg = bb_strtou32(line, NULL, 10);
+ return errno == 0;
}
static int read_yn(const char *line, void *arg)
{
char *dest = arg;
- int retval = 1;
- if (!strcasecmp("yes", line))
+ if (!strcasecmp("yes", line)) {
*dest = 1;
- else if (!strcasecmp("no", line))
+ return 1;
+ }
+ if (!strcasecmp("no", line)) {
*dest = 0;
- else retval = 0;
+ return 1;
+ }
+ return 0;
+}
- return retval;
+
+/* 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 */
}
{
struct option_set **opt_list = arg;
char *opt, *val, *endptr;
- struct dhcp_option *option;
- int retval = 0, length;
- char buffer[8];
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;
- if (!(opt = strtok(line, " \t="))) return 0;
-
- for (option = dhcp_options; option->code; option++)
- if (!strcasecmp(option->name, opt))
- break;
+ opt = strtok(line, " \t=");
+ if (!opt)
+ return 0;
- if (!option->code) 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 {
- if (!(val = strtok(NULL, ", \t"))) break;
- length = option_lengths[option->flags & TYPE_MASK];
+ 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) {
break;
case OPTION_IP_PAIR:
retval = read_ip(val, buffer);
- if (!(val = strtok(NULL, ", \t/-"))) retval = 0;
- if (retval) retval = read_ip(val, buffer + 4);
+ 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;
buffer[0] = strtoul(val, &endptr, 0);
retval = (endptr[0] == '\0');
break;
- case OPTION_U16:
- *result_u16 = htons(strtoul(val, &endptr, 0));
- retval = (endptr[0] == '\0');
+ /* 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:
- *result_u16 = htons(strtol(val, &endptr, 0));
+ }
+ case OPTION_S16: {
+ long tmp = strtol(val, &endptr, 0);
+ *result_u16 = htons(tmp);
retval = (endptr[0] == '\0');
break;
- case OPTION_U32:
- *result_u32 = htonl(strtoul(val, &endptr, 0));
+ }
+ case OPTION_U32: {
+ unsigned long tmp = strtoul(val, &endptr, 0);
+ *result_u32 = htonl(tmp);
retval = (endptr[0] == '\0');
break;
- case OPTION_S32:
- *result_u32 = htonl(strtol(val, &endptr, 0));
+ }
+ case OPTION_S32: {
+ long tmp = strtol(val, &endptr, 0);
+ *result_u32 = htonl(tmp);
retval = (endptr[0] == '\0');
break;
+ }
default:
break;
}
return retval;
}
+static int 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));
+
+ /* Read mac */
+ line = (char *) const_line;
+ mac_string = strtok(line, " \t");
+ read_mac(mac_string, mac_bytes);
+
+ /* Read ip */
+ ip_string = strtok(NULL, " \t");
+ read_ip(ip_string, ip);
+
+ addStaticLease(arg, mac_bytes, ip);
+
+ if (ENABLE_FEATURE_UDHCP_DEBUG) printStaticLeases(arg);
+
+ return 1;
+}
+
+
+struct config_keyword {
+ const char *keyword;
+ int (*handler)(const char *line, void *var);
+ void *var;
+ const char *def;
+};
static const struct config_keyword keywords[] = {
- /* keyword handler variable address default */
- {"start", read_ip, &(server_config.start), "192.168.0.20"},
- {"end", read_ip, &(server_config.end), "192.168.0.254"},
- {"interface", read_str, &(server_config.interface), "eth0"},
- {"option", read_opt, &(server_config.options), ""},
- {"opt", read_opt, &(server_config.options), ""},
- {"max_leases", read_u32, &(server_config.max_leases), "254"},
- {"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), ""},
- /*ADDME: static lease */
- {"", NULL, NULL, ""}
+ /* 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), ""},
+ /* 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 */
};
+/*
+ * 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)
{
FILE *in;
char buffer[READ_CONFIG_BUF_SIZE], *token, *line;
-#ifdef UDHCP_DEBUG
- char orig[READ_CONFIG_BUF_SIZE];
-#endif
int i, lm = 0;
- for (i = 0; keywords[i].keyword[0]; i++)
+ for (i = 0; i < ARRAY_SIZE(keywords); i++)
if (keywords[i].def[0])
keywords[i].handler(keywords[i].def, keywords[i].var);
- if (!(in = fopen(file, "r"))) {
- LOG(LOG_ERR, "unable to open config file: %s", file);
+ 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++;
- if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
-#ifdef UDHCP_DEBUG
- strcpy(orig, buffer);
-#endif
- if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
+ *strchrnul(buffer, '\n') = '\0';
+ if (ENABLE_FEATURE_UDHCP_DEBUG)
+ strcpy(debug_orig, buffer);
+ *strchrnul(buffer, '#') = '\0';
- if (!(token = strtok(buffer, " \t"))) continue;
- if (!(line = strtok(NULL, ""))) continue;
+ token = strtok(buffer, " \t");
+ if (!token) continue;
+ line = strtok(NULL, "");
+ if (!line) continue;
/* eat leading whitespace */
- line = line + strspn(line, " \t=");
+ line = skip_whitespace(line);
/* eat trailing whitespace */
- for (i = strlen(line); i > 0 && isspace(line[i - 1]); i--);
- line[i] = '\0';
+ i = strlen(line) - 1;
+ while (i >= 0 && isspace(line[i]))
+ line[i--] = '\0';
- for (i = 0; keywords[i].keyword[0]; i++)
+ for (i = 0; i < ARRAY_SIZE(keywords); i++)
if (!strcasecmp(token, keywords[i].keyword))
if (!keywords[i].handler(line, keywords[i].var)) {
- LOG(LOG_ERR, "Failure parsing line %d of %s", lm, file);
- DEBUG(LOG_ERR, "unable to parse '%s'", orig);
+ bb_error_msg("cannot parse line %d of %s", lm, file);
+ if (ENABLE_FEATURE_UDHCP_DEBUG)
+ bb_error_msg("cannot parse '%s'", debug_orig);
/* reset back to the default value */
keywords[i].handler(keywords[i].def, keywords[i].var);
}
}
fclose(in);
+
+ server_config.start_ip = ntohl(server_config.start_ip);
+ server_config.end_ip = ntohl(server_config.end_ip);
+
return 1;
}
void write_leases(void)
{
- FILE *fp;
- unsigned int i;
- char buf[255];
+ int fp;
+ unsigned i;
time_t curr = time(0);
unsigned long tmp_time;
- if (!(fp = fopen(server_config.lease_file, "w"))) {
- LOG(LOG_ERR, "Unable to open %s for writing", server_config.lease_file);
+ fp = open3_or_warn(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC, 0666);
+ if (fp < 0) {
return;
}
else leases[i].expires -= curr;
} /* else stick with the time we got */
leases[i].expires = htonl(leases[i].expires);
- fwrite(&leases[i], sizeof(struct dhcpOfferedAddr), 1, fp);
+ // FIXME: error check??
+ full_write(fp, &leases[i], sizeof(leases[i]));
- /* Then restore it when done. */
+ /* then restore it when done */
leases[i].expires = tmp_time;
}
}
- fclose(fp);
+ close(fp);
if (server_config.notify_file) {
- sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
- system(buf);
+ char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
+ system(cmd);
+ free(cmd);
}
}
void read_leases(const char *file)
{
- FILE *fp;
+ int fp;
unsigned int i = 0;
struct dhcpOfferedAddr lease;
- if (!(fp = fopen(file, "r"))) {
- LOG(LOG_ERR, "Unable to open %s for reading", file);
+ fp = open_or_warn(file, O_RDONLY);
+ if (fp < 0) {
return;
}
- while (i < server_config.max_leases && (fread(&lease, sizeof lease, 1, fp) == 1)) {
+ while (i < server_config.max_leases
+ && full_read(fp, &lease, sizeof(lease)) == sizeof(lease)
+ ) {
/* ADDME: is it a static lease */
- if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
+ uint32_t y = ntohl(lease.yiaddr);
+ 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 (!server_config.remaining)
+ lease.expires -= time(0);
if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
- LOG(LOG_WARNING, "Too many leases while loading %s\n", file);
+ bb_error_msg("too many leases while loading %s", file);
break;
}
i++;
}
}
- DEBUG(LOG_INFO, "Read %d leases", i);
- fclose(fp);
+ DEBUG("Read %d leases", i);
+ close(fp);
}
projects / oweals / busybox.git / blobdiff