// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/* Copyright (c) 2020 Facebook */
#include <linux/bpf.h>
#include <linux/ptrace.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

#include "replica.h"

char LICENSE[] SEC("license") = "Dual BSD/GPL";

int my_pid = 0;

struct {
	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
	__uint(key_size, sizeof(int));
	__uint(value_size, sizeof(int));
} channel SEC(".maps");

SEC("uprobe/kvs_create_snapshot_async")
int uprobe_create_snapshot_async(struct pt_regs *ctx)
{
    struct event ev;
	__builtin_memset(&ev, 0, sizeof(ev));

    const char *ip;
    __u32 port;

    ev.type = EVENT_CREATE_SNAPSHOT_ASYNC;

    ip   = (const char *)PT_REGS_PARM1(ctx);
    port = (__u32)PT_REGS_PARM2(ctx);

    bpf_probe_read_user_str(ev.data.sync.ip,
                            sizeof(ev.data.sync.ip),
                            ip);
    ev.data.sync.port = port;

    bpf_perf_event_output(ctx, &channel,
                          BPF_F_CURRENT_CPU,
                          &ev, sizeof(ev));
    return 0;
}

SEC("uprobe/__compeleted_cmd")
int uprobe_completed_cmd(struct pt_regs *ctx)
{
    struct event ev;
	__builtin_memset(&ev, 0, sizeof(ev));

    const __u8 *cmd;
    __u32 len;

    ev.type = EVENT_COMPLETED_CMD;

    cmd = (const __u8 *)PT_REGS_PARM1(ctx);
    len = (__u32)PT_REGS_PARM2(ctx);

    if (len > sizeof(ev.data.cmd.cmd))
        len = sizeof(ev.data.cmd.cmd);

    ev.data.cmd.len = len;

    bpf_probe_read_user(ev.data.cmd.cmd, len, cmd);

    bpf_perf_event_output(ctx, &channel,
                          BPF_F_CURRENT_CPU,
                          &ev, sizeof(ev));
    return 0;
}


SEC("uprobe/__create_snapshot_ok")
int uprobe_create_snapshot_ok(struct pt_regs *ctx)
{
    struct event ev;
	__builtin_memset(&ev, 0, sizeof(ev));
	
    const char *array_file;
    const char *rbtree_file;
    const char *hash_file;

    ev.type = EVENT_CREATE_SNAPSHOT_OK;

    array_file  = (const char *)PT_REGS_PARM1(ctx);
    rbtree_file = (const char *)PT_REGS_PARM2(ctx);
    hash_file   = (const char *)PT_REGS_PARM3(ctx);

    bpf_probe_read_user_str(ev.data.ok.array_file,
                            sizeof(ev.data.ok.array_file),
                            array_file);
    bpf_probe_read_user_str(ev.data.ok.rbtree_file,
                            sizeof(ev.data.ok.rbtree_file),
                            rbtree_file);
    bpf_probe_read_user_str(ev.data.ok.hash_file,
                            sizeof(ev.data.ok.hash_file),
                            hash_file);

    bpf_perf_event_output(ctx, &channel,
                          BPF_F_CURRENT_CPU,
                          &ev, sizeof(ev));
    return 0;
}