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#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "benc.h"
#include "iobuf.h"
#include "btpd_if.h"
int
ipc_open(const char *key, struct ipc **out)
{
size_t plen;
size_t keylen;
struct ipc *res;
if (key == NULL)
key = "default";
keylen = strlen(key);
for (int i = 0; i < keylen; i++)
if (!isalnum(key[i]))
return EINVAL;
res = malloc(sizeof(*res));
if (res == NULL)
return ENOMEM;
plen = sizeof(res->addr.sun_path);
if (snprintf(res->addr.sun_path, plen,
"/tmp/btpd_%u_%s", geteuid(), key) >= plen) {
free(res);
return ENAMETOOLONG;
}
res->addr.sun_family = AF_UNIX;
*out = res;
return 0;
}
int
ipc_close(struct ipc *ipc)
{
free(ipc);
return 0;
}
static int
ipc_connect(struct ipc *ipc, FILE **out)
{
FILE *fp;
int sd;
int error;
if ((sd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
return errno;
if (connect(sd, (struct sockaddr *)&ipc->addr, sizeof(ipc->addr)) == -1)
goto error;
if ((fp = fdopen(sd, "r+")) == NULL)
goto error;
*out = fp;
return 0;
error:
error = errno;
close(sd);
return error;
}
static int
ipc_response(FILE *fp, char **out, uint32_t *len)
{
uint32_t size;
char *buf;
if (fread(&size, sizeof(size), 1, fp) != 1) {
if (ferror(fp))
return errno;
else
return ECONNRESET;
}
if (size == 0)
return EINVAL;
if ((buf = malloc(size)) == NULL)
return ENOMEM;
if (fread(buf, 1, size, fp) != size) {
if (ferror(fp))
return errno;
else
return ECONNRESET;
}
*out = buf;
*len = size;
return 0;
}
static int
ipc_req_res(struct ipc *ipc,
const char *req, uint32_t qlen,
char **res, uint32_t *rlen)
{
FILE *fp;
int error;
if ((error = ipc_connect(ipc, &fp)) != 0)
return error;
if (fwrite(&qlen, sizeof(qlen), 1, fp) != 1)
goto error;
if (fwrite(req, 1, qlen, fp) != qlen)
goto error;
if (fflush(fp) != 0)
goto error;
if ((errno = ipc_response(fp, res, rlen)) != 0)
goto error;
if ((errno = benc_validate(*res, *rlen)) != 0)
goto error;
fclose(fp);
return 0;
error:
error = errno;
fclose(fp);
return error;
}
int
btpd_die(struct ipc *ipc)
{
int error;
char *response = NULL;
const char shutdown[] = "l3:diee";
uint32_t size = sizeof(shutdown) - 1;
uint32_t rsiz;
if ((error = ipc_req_res(ipc, shutdown, size, &response, &rsiz)) != 0)
return error;
error = benc_validate(response, rsiz);
if (error == 0) {
int64_t tmp;
benc_dget_int64(response, "code", &tmp);
error = tmp;
}
free(response);
return error;
}
int
btpd_add(struct ipc *ipc, char **paths, unsigned npaths, char **out)
{
int error;
struct io_buffer iob;
char *res = NULL;
uint32_t reslen;
buf_init(&iob, 1024);
buf_print(&iob, "l3:add");
for (unsigned i = 0; i < npaths; i++) {
int plen = strlen(paths[i]);
buf_print(&iob, "%d:", plen);
buf_write(&iob, paths[i], plen);
}
buf_print(&iob, "e");
error = ipc_req_res(ipc, iob.buf, iob.buf_off, &res, &reslen);
free(iob.buf);
if (error == 0)
*out = res;
return error;
}
int
btpd_stat(struct ipc *ipc, char **out)
{
const char cmd[] = "l4:state";
uint32_t cmdlen = sizeof(cmd) - 1;
char *res;
uint32_t reslen;
if ((errno = ipc_req_res(ipc, cmd, cmdlen, &res, &reslen)) != 0)
return errno;
*out = res;
return 0;
}
int
btpd_del(struct ipc *ipc, uint8_t (*hash)[20], unsigned nhashes, char **out)
{
int error;
struct io_buffer iob;
char *res = NULL;
uint32_t reslen;
buf_init(&iob, 1024);
buf_write(&iob, "l3:del", 6);
for (unsigned i = 0; i < nhashes; i++) {
buf_write(&iob, "20:", 3);
buf_write(&iob, hash[i], 20);
}
buf_write(&iob, "e", 1);
error = ipc_req_res(ipc, iob.buf, iob.buf_off, &res, &reslen);
free(iob.buf);
if (error != 0)
return error;
*out = res;
return 0;
}
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