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51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ptrace.h>
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#include <linux/bpf.h>
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#include <netinet/in.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#if defined(__TARGET_ARCH_x86)
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#define SYSCALL_WRAPPER 1
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#define SYS_PREFIX "__x64_"
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#elif defined(__TARGET_ARCH_s390)
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#define SYSCALL_WRAPPER 1
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#define SYS_PREFIX "__s390x_"
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#elif defined(__TARGET_ARCH_arm64)
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#define SYSCALL_WRAPPER 1
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#define SYS_PREFIX "__arm64_"
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#else
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#define SYSCALL_WRAPPER 0
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#define SYS_PREFIX ""
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#endif
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static struct sockaddr_in old;
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SEC("kprobe/" SYS_PREFIX "sys_connect")
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int BPF_KPROBE(handle_sys_connect)
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{
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#if SYSCALL_WRAPPER == 1
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struct pt_regs *real_regs;
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#endif
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struct sockaddr_in new;
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void *ptr;
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#if SYSCALL_WRAPPER == 0
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ptr = (void *)PT_REGS_PARM2(ctx);
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#else
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real_regs = (struct pt_regs *)PT_REGS_PARM1(ctx);
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bpf_probe_read_kernel(&ptr, sizeof(ptr), &PT_REGS_PARM2(real_regs));
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#endif
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bpf_probe_read_user(&old, sizeof(old), ptr);
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__builtin_memset(&new, 0xab, sizeof(new));
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bpf_probe_write_user(ptr, &new, sizeof(new));
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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