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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "log.h"
#include "radius.h"
static int urandom_fd;
int rad_packet_build(struct rad_packet_t *pack)
{
struct rad_req_attr_t *attr;
uint8_t *ptr;
ptr = malloc(pack->len);
if (!ptr) {
log_error("radius:packet: out of memory\n");
return -1;
}
*ptr = pack->code; ptr++;
*ptr = pack->id; ptr++;
*(uint16_t*)ptr = pack->len; ptr+= 2;
while (1) {
if (read(urandom_fd, ptr, 16) != 16) {
if (errno == EINTR)
continue;
log_error("radius:packet:read urandom: %s\n", strerror(errno));
goto out_err;
}
break;
}
ptr+=16;
list_for_each_entry(attr, &pack->attrs, entry) {
*ptr = attr->attr->type; ptr++;
*ptr = attr->len; ptr++;
switch(attr->attr->type) {
case ATTR_TYPE_INTEGER:
*(uint32_t*)ptr = attr->val.integer;
break;
case ATTR_TYPE_STRING:
memcpy(ptr, attr->val.string, attr->len);
break;
case ATTR_TYPE_IPADDR:
*(in_addr_t*)ptr = attr->val.ipaddr;
break;
case ATTR_TYPE_DATE:
*(uint32_t*)ptr = attr->val.date;
break;
default:
log_error("radius:packet: unknown attribute type\n");
abort();
}
ptr += attr->len;
}
return 0;
out_err:
free(ptr);
return -1;
}
struct rad_packet_t *rad_packet_recv(int fd)
{
struct rad_packet_t *pack;
struct rad_req_attr_t *attr;
struct rad_dict_attr_t *da;
uint8_t *ptr;
int n, type, len;
pack = malloc(sizeof(*pack));
if (!pack) {
log_error("radius:packet: out of memory\n");
return NULL;
}
memset(pack, 0, sizeof(*pack));
INIT_LIST_HEAD(&pack->attrs);
pack->buf = malloc(REQ_LENGTH_MAX);
if (!pack->buf) {
log_error("radius:packet: out of memory\n");
free(pack);
return NULL;
}
while (1) {
n = read(fd, pack->buf, REQ_LENGTH_MAX);
if (n < 0) {
if (errno == EINTR)
continue;
log_error("radius:packet:read: %s\n", strerror(errno));
goto out_err;
}
break;
}
if (n < 20) {
log_warn("radius:packet: short packed received (%i)\n", n);
goto out_err;
}
ptr = (uint8_t *)pack->buf;
pack->code = *ptr; ptr++;
pack->id = *ptr; ptr++;
pack->len = *(uint16_t*)ptr; ptr += 2;
if (pack->len > n) {
log_warn("radius:packet: short packet received %i, expected %i\n", pack->len, n);
goto out_err;
}
ptr += 16;
n -= 20;
while (n>0) {
type = *ptr; ptr++;
len = *ptr; ptr++;
if (2 + len > n) {
log_error("radius:packet: too long attribute received (%i, %i)\n", type, len);
goto out_err;
}
da = rad_dict_find_attr_type(type);
if (da) {
attr = malloc(sizeof(*attr));
if (!attr) {
log_error("radius:packet: out of memory\n");
goto out_err;
}
attr->attr = da;
attr->len = len;
if (type == ATTR_TYPE_STRING) {
attr->val.string = malloc(len);
if (!attr->val.string) {
log_error("radius:packet: out of memory\n");
free(attr);
goto out_err;
}
} else
memcpy(&attr->val.integer, ptr, 4);
list_add_tail(&attr->entry, &pack->attrs);
} else
log_warn("radius:packet: unknown attribute type received (%i)\n", type);
ptr += len;
n -= 2 + len;
}
return pack;
out_err:
rad_packet_free(pack);
return NULL;
}
void rad_packet_free(struct rad_packet_t *pack)
{
struct rad_req_attr_t *attr;
if (pack->buf)
free(pack->buf);
while(!list_empty(&pack->attrs)) {
attr = list_entry(pack->attrs.next, typeof(*attr), entry);
if (attr->attr->type == ATTR_TYPE_STRING)
free((char*)attr->val.string);
list_del(&attr->entry);
free(attr);
}
free(pack);
}
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