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#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include "linux_ppp.h"
#include "ppp.h"
#include "ppp_lcp.h"
#include "log.h"
#include "events.h"
#include "memdebug.h"
static int conf_pcomp = 0;
static struct lcp_option_t *pcomp_init(struct ppp_lcp_t *lcp);
static void pcomp_free(struct ppp_lcp_t *lcp, struct lcp_option_t *opt);
static int pcomp_send_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
static int pcomp_recv_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
static int pcomp_recv_conf_rej(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
static int pcomp_recv_conf_nak(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
static int pcomp_recv_conf_ack(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
static void pcomp_print(void (*print)(const char *fmt, ...), struct lcp_option_t *opt, uint8_t *ptr);
struct pcomp_option_t
{
struct lcp_option_t opt;
int pcomp; // 0 - disabled, 1 - enabled, 2 - allow,disabled, 3 - allow,enabled
};
static struct lcp_option_handler_t pcomp_opt_hnd =
{
.init = pcomp_init,
.send_conf_req = pcomp_send_conf_req,
.recv_conf_req = pcomp_recv_conf_req,
.recv_conf_rej = pcomp_recv_conf_rej,
.recv_conf_nak = pcomp_recv_conf_nak,
.recv_conf_ack = pcomp_recv_conf_ack,
.free = pcomp_free,
.print = pcomp_print,
};
static struct lcp_option_t *pcomp_init(struct ppp_lcp_t *lcp)
{
struct pcomp_option_t *pcomp_opt = _malloc(sizeof(*pcomp_opt));
memset(pcomp_opt, 0, sizeof(*pcomp_opt));
pcomp_opt->pcomp = conf_pcomp;
pcomp_opt->opt.id = CI_PCOMP;
pcomp_opt->opt.len = 2;
return &pcomp_opt->opt;
}
static void pcomp_free(struct ppp_lcp_t *lcp, struct lcp_option_t *opt)
{
struct pcomp_option_t *pcomp_opt = container_of(opt, typeof(*pcomp_opt), opt);
_free(pcomp_opt);
}
static int pcomp_send_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr)
{
struct pcomp_option_t *pcomp_opt = container_of(opt, typeof(*pcomp_opt), opt);
struct lcp_opt_hdr_t *opt0 = (struct lcp_opt_hdr_t*)ptr;
if (pcomp_opt->pcomp & 1) {
opt0->id = CI_PCOMP;
opt0->len = 2;
return 2;
}
return 0;
}
static int pcomp_recv_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr)
{
struct pcomp_option_t *pcomp_opt = container_of(opt, typeof(*pcomp_opt), opt);
struct lcp_opt_hdr_t *opt0 = (struct lcp_opt_hdr_t*)ptr;
if (opt0->len != 2)
return LCP_OPT_REJ;
if (pcomp_opt->pcomp & 2)
return LCP_OPT_ACK;
else
return LCP_OPT_REJ;
}
static int pcomp_recv_conf_rej(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr)
{
struct pcomp_option_t *pcomp_opt = container_of(opt, typeof(*pcomp_opt), opt);
pcomp_opt->pcomp &= ~1;
return 0;
}
static int pcomp_recv_conf_nak(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr)
{
struct pcomp_option_t *pcomp_opt = container_of(opt, typeof(*pcomp_opt), opt);
struct lcp_opt_hdr_t *opt0 = (struct lcp_opt_hdr_t*)ptr;
if (opt0->len != 2)
return -1;
/* treat as reject */
return pcomp_recv_conf_rej(lcp, opt, ptr);
}
static int pcomp_recv_conf_ack(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr)
{
struct pcomp_option_t *pcomp_opt = container_of(opt, typeof(*pcomp_opt), opt);
int flags;
if (net->ppp_ioctl(lcp->ppp->chan_fd, PPPIOCGFLAGS, &flags))
goto err;
flags &= ~SC_COMP_PROT;
if (pcomp_opt->pcomp & 1)
flags |= SC_COMP_PROT;
if (net->ppp_ioctl(lcp->ppp->chan_fd, PPPIOCSFLAGS, &flags))
goto err;
return 0;
err:
if (errno != EIO)
log_ppp_error("lcp:pcomp: failed to set channel ACCOMP: %s\n", strerror(errno));
return -1;
}
static void pcomp_print(void (*print)(const char *fmt, ...), struct lcp_option_t *opt, uint8_t *ptr)
{
print("<pcomp>");
}
static void load_config(void)
{
char *opt;
opt = conf_get_opt("ppp", "pcomp");
if (opt) {
if (!strcmp(opt, "deny"))
conf_pcomp = 0;
else if (!strcmp(opt, "allow"))
conf_pcomp = 1 | 2;
else
conf_pcomp = atoi(opt);
}
}
static void pcomp_opt_init()
{
lcp_option_register(&pcomp_opt_hnd);
load_config();
triton_event_register_handler(EV_CONFIG_RELOAD, (triton_event_func)load_config);
}
DEFINE_INIT(4, pcomp_opt_init);
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