@@ -1,64 +1,106 @@
// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 Telegram FZ-LLC
+ */
+
#define _GNU_SOURCE
-#include <sys/uio.h>
+
+#include <unistd.h>
+#include <errno.h>
+
#include <errno.h>
#include <stdio.h>
-#include <sys/socket.h>
-#include <fcntl.h>
+#include <string.h>
#include <unistd.h>
-#include "../../include/uapi/linux/bpf.h"
-#include <asm/unistd.h>
+
+#include "context.h"
+#include "filter-table.h"
#include "msgfmt.h"
+#include "sockopt.h"
-FILE *debug_f;
+#define do_exact(fd, op, buffer, count) \
+ ({ \
+ size_t total = 0; \
+ int err = 0; \
+ \
+ do { \
+ const ssize_t part = op(fd, (buffer) + total, (count) - total); \
+ if (part > 0) { \
+ total += part; \
+ } else if (part == 0 && (count) > 0) { \
+ err = -EIO; \
+ break; \
+ } else if (part == -1) { \
+ if (errno == EINTR) \
+ continue; \
+ err = -errno; \
+ break; \
+ } \
+ } while (total < (count)); \
+ \
+ err; \
+ })
-static int handle_get_cmd(struct mbox_request *cmd)
+static int read_exact(int fd, void *buffer, size_t count)
{
- switch (cmd->cmd) {
- case 0:
- return 0;
- default:
- break;
- }
- return -ENOPROTOOPT;
+ return do_exact(fd, read, buffer, count);
}
-static int handle_set_cmd(struct mbox_request *cmd)
+static int write_exact(int fd, const void *buffer, size_t count)
{
- return -ENOPROTOOPT;
+ return do_exact(fd, write, buffer, count);
}
-static void loop(void)
+static int setup_context(struct context *ctx)
{
- while (1) {
- struct mbox_request req;
- struct mbox_reply reply;
- int n;
-
- n = read(0, &req, sizeof(req));
- if (n != sizeof(req)) {
- fprintf(debug_f, "invalid request %d\n", n);
- return;
- }
-
- reply.status = req.is_set ?
- handle_set_cmd(&req) :
- handle_get_cmd(&req);
-
- n = write(1, &reply, sizeof(reply));
- if (n != sizeof(reply)) {
- fprintf(debug_f, "reply failed %d\n", n);
- return;
- }
+ ctx->log_file = fopen("/dev/kmsg", "w");
+ if (!ctx->log_file)
+ return -errno;
+
+ errno = 0;
+ if (setvbuf(ctx->log_file, 0, _IOLBF, 0))
+ return errno ? -errno : -EINVAL;
+
+ return create_filter_table(ctx);
+}
+
+static void loop(struct context *ctx)
+{
+ struct mbox_request req;
+ struct mbox_reply reply;
+ int err;
+
+ for (;;) {
+ err = read_exact(STDIN_FILENO, &req, sizeof(req));
+ if (err)
+ BFLOG_EMERG(ctx, "cannot read request: %s\n", strerror(-err));
+
+ reply.status = handle_sockopt_request(ctx, &req);
+
+ err = write_exact(STDOUT_FILENO, &reply, sizeof(reply));
+ if (err)
+ BFLOG_EMERG(ctx, "cannot write reply: %s\n", strerror(-err));
}
}
int main(void)
{
- debug_f = fopen("/dev/kmsg", "w");
- setvbuf(debug_f, 0, _IOLBF, 0);
- fprintf(debug_f, "<5>Started bpfilter\n");
- loop();
- fclose(debug_f);
+ struct context ctx;
+ int err;
+
+ err = create_context(&ctx);
+ if (err)
+ return err;
+
+ err = setup_context(&ctx);
+ if (err) {
+ free_context(&ctx);
+ return err;
+ }
+
+ BFLOG_NOTICE(&ctx, "started\n");
+
+ loop(&ctx);
+
return 0;
}
Use earlier introduced infrastructure and handle setsockopt(2) calls. Signed-off-by: Dmitrii Banshchikov <me@ubique.spb.ru> --- net/bpfilter/main.c | 126 +++++++++++++++++++++++++++++--------------- 1 file changed, 84 insertions(+), 42 deletions(-)