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rpcd-mod-luci: handle lease files from all dnsmasq/odhcpd sections

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Fixes: #911, #4303, #4308
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2020-11-07 00:25:22 +01:00
parent 1c482dde3d
commit 0c7a335230
1 changed files with 135 additions and 112 deletions
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199
libs/rpcd-mod-luci/src/luci.c
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@ -315,9 +315,12 @@ duid2ea(const char *duid)
static struct {
FILE *dnsmasq_file;
FILE *odhcpd_file;
time_t now;
size_t num, off;
struct {
FILE *fh;
bool odhcpd;
} *files;
} lease_state = { };
struct lease_entry {
@ -333,13 +336,41 @@ struct lease_entry {
} addr[10];
};
static char *
find_leasefile(struct uci_context *uci, const char *section)
static bool
add_leasefile(const char *path, bool is_odhcpd)
{
void *ptr;
FILE *fh;
fh = fopen(path, "r");
if (!fh)
return false;
ptr = realloc(lease_state.files, sizeof(*lease_state.files) * (lease_state.num + 1));
if (!ptr) {
fclose(fh);
return false;
}
lease_state.files = ptr;
lease_state.files[lease_state.num].fh = fh;
lease_state.files[lease_state.num].odhcpd = is_odhcpd;
lease_state.num++;
return true;
}
static bool
find_leasefiles(struct uci_context *uci, bool is_odhcpd)
{
struct uci_ptr ptr = { .package = "dhcp" };
struct uci_package *pkg = NULL;
struct uci_section *s;
struct uci_element *e;
bool found = false;
pkg = uci_lookup_package(uci, ptr.package);
@ -353,7 +384,7 @@ find_leasefile(struct uci_context *uci, const char *section)
uci_foreach_element(&pkg->sections, e) {
s = uci_to_section(e);
if (strcmp(s->type, section))
if (strcmp(s->type, is_odhcpd ? "odhcpd" : "dnsmasq"))
continue;
ptr.flags = 0;
@ -370,31 +401,30 @@ find_leasefile(struct uci_context *uci, const char *section)
if (ptr.o->type != UCI_TYPE_STRING)
continue;
return ptr.o->v.string;
if (add_leasefile(ptr.o->v.string, is_odhcpd))
found = true;
}
return NULL;
return found;
}
static void
lease_close(void)
{
if (lease_state.dnsmasq_file) {
fclose(lease_state.dnsmasq_file);
lease_state.dnsmasq_file = NULL;
}
while (lease_state.num > 0)
fclose(lease_state.files[--lease_state.num].fh);
if (lease_state.odhcpd_file) {
fclose(lease_state.odhcpd_file);
lease_state.odhcpd_file = NULL;
}
free(lease_state.files);
lease_state.files = NULL;
lease_state.num = 0;
lease_state.off = 0;
}
static void
lease_open(void)
{
struct uci_context *uci;
char *p;
lease_close();
@ -405,11 +435,11 @@ lease_open(void)
lease_state.now = time(NULL);
p = find_leasefile(uci, "dnsmasq");
lease_state.dnsmasq_file = fopen(p ? p : "/tmp/dhcp.leases", "r");
if (!find_leasefiles(uci, false))
add_leasefile("/tmp/dhcp.leases", false);
p = find_leasefile(uci, "odhcpd");
lease_state.odhcpd_file = fopen(p ? p : "/tmp/hosts/odhcpd", "r");
if (!find_leasefiles(uci, true))
add_leasefile("/tmp/hosts/odhcpd", true);
uci_free_context(uci);
}
@ -424,8 +454,65 @@ lease_next(void)
memset(&e, 0, sizeof(e));
if (lease_state.dnsmasq_file) {
while (fgets(e.buf, sizeof(e.buf), lease_state.dnsmasq_file)) {
while (lease_state.off < lease_state.num) {
while (fgets(e.buf, sizeof(e.buf), lease_state.files[lease_state.off].fh)) {
if (lease_state.files[lease_state.off].odhcpd) {
strtok(e.buf, " \t\n"); /* # */
strtok(NULL, " \t\n"); /* iface */
e.duid = strtok(NULL, " \t\n"); /* duid */
if (!e.duid)
continue;
p = strtok(NULL, " \t\n"); /* iaid */
if (p)
e.af = strcmp(p, "ipv4") ? AF_INET6 : AF_INET;
else
continue;
e.hostname = strtok(NULL, " \t\n"); /* name */
if (!e.hostname)
continue;
p = strtok(NULL, " \t\n"); /* ts */
if (!p)
continue;
n = strtol(p, NULL, 10);
if (n > lease_state.now)
e.expire = n - lease_state.now;
else if (n >= 0)
e.expire = 0;
else
e.expire = -1;
strtok(NULL, " \t\n"); /* id */
strtok(NULL, " \t\n"); /* length */
for (e.n_addr = 0, p = strtok(NULL, "/ \t\n");
e.n_addr < ARRAY_SIZE(e.addr) && p != NULL;
p = strtok(NULL, "/ \t\n")) {
if (inet_pton(e.af, p, &e.addr[e.n_addr].in6))
e.n_addr++;
}
ea = duid2ea(e.duid);
if (ea)
e.mac = *ea;
if (!strcmp(e.hostname, "-"))
e.hostname = NULL;
if (!strcmp(e.duid, "-"))
e.duid = NULL;
}
else {
p = strtok(e.buf, " \t\n");
if (!p)
@ -481,76 +568,12 @@ lease_next(void)
if (ea)
e.mac = *ea;
}
return &e;
}
fclose(lease_state.dnsmasq_file);
lease_state.dnsmasq_file = NULL;
}
if (lease_state.odhcpd_file) {
while (fgets(e.buf, sizeof(e.buf), lease_state.odhcpd_file)) {
strtok(e.buf, " \t\n"); /* # */
strtok(NULL, " \t\n"); /* iface */
e.duid = strtok(NULL, " \t\n"); /* duid */
if (!e.duid)
continue;
p = strtok(NULL, " \t\n"); /* iaid */
if (p)
e.af = strcmp(p, "ipv4") ? AF_INET6 : AF_INET;
else
continue;
e.hostname = strtok(NULL, " \t\n"); /* name */
if (!e.hostname)
continue;
p = strtok(NULL, " \t\n"); /* ts */
if (!p)
continue;
n = strtol(p, NULL, 10);
if (n > lease_state.now)
e.expire = n - lease_state.now;
else if (n >= 0)
e.expire = 0;
else
e.expire = -1;
strtok(NULL, " \t\n"); /* id */
strtok(NULL, " \t\n"); /* length */
for (e.n_addr = 0, p = strtok(NULL, "/ \t\n");
e.n_addr < ARRAY_SIZE(e.addr) && p != NULL;
p = strtok(NULL, "/ \t\n")) {
if (inet_pton(e.af, p, &e.addr[e.n_addr].in6))
e.n_addr++;
}
ea = duid2ea(e.duid);
if (ea)
e.mac = *ea;
if (!strcmp(e.hostname, "-"))
e.hostname = NULL;
if (!strcmp(e.duid, "-"))
e.duid = NULL;
return &e;
}
fclose(lease_state.odhcpd_file);
lease_state.odhcpd_file = NULL;
lease_state.off++;
}
return NULL;