sehttpd's Introduction

seHTTPd

seHTTPd implements a small and efficient web server with 1K lines of C code. I/O multiplexing is achieved using epoll.

Features

Single-threaded, non-blocking I/O based on event-driven model
HTTP persistent connection (HTTP Keep-Alive)
A timer for executing the handler after having waited the specified time

High-level Design

+----------------------------------------------+
|                                              |
|  +-----------+   wait   +-----------------+  |  copy   +---------+
|  |           +---------->                 +------------>         |
|  | IO Device |    1     | Kernel's buffer |  |   2     | Process |
|  |           <----------+                 <------------+         |
|  +-----------+          +-----------------+  |         +---------+
|                                              |
+----------------------------------------------+

Build from Source

At the moment, seHTTPd supports Linux based systems with epoll system call. Building seHTTPd is straightforward.

$ make

Default server

./sehttpd

Specify the port

./sehttpd -p 8082

Specify the port number with -p flag, by default the server accepts connections on port 8081.

Specify the web root

./sehttpd -w ./www

Specify the web root with -w flag, by default the web root is "./www".

License

seHTTPd is released under the MIT License. Use of this source code is governed by a MIT License that can be found in the LICENSE file.

sehttpd's Issues

Failed to load the ebpf program

Running the epbf program

$ sudo python http-parse-sample.py

will get this error:

bpf: Failed to load program: Permission denied
0: (bf) r6 = r1
1: (28) r0 = *(u16 *)skb[12]
2: (55) if r0 != 0x800 goto pc+96
 R0_w=inv2048 R6_w=ctx(id=0,off=0,imm=0) R10=fp0
3: (30) r0 = *(u8 *)skb[23]
4: (55) if r0 != 0x6 goto pc+94
 R0_w=inv6 R6_w=ctx(id=0,off=0,imm=0) R10=fp0
5: (30) r0 = *(u8 *)skb[14]
6: (bf) r8 = r0
7: (67) r8 <<= 2
8: (57) r8 &= 60
9: (b7) r1 = 20
10: (2d) if r1 > r8 goto pc+88
 R0=inv(id=0) R1=inv20 R6=ctx(id=0,off=0,imm=0) R8=inv(id=0,umin_value=20,umax_value=60,var_off=(0x0; 0x3c)) R10=fp0
11: (bf) r7 = r8
12: (07) r7 += 26
13: (50) r0 = *(u8 *)skb[r7 + 0]
14: (bf) r7 = r0
15: (28) r0 = *(u16 *)skb[16]
16: (1f) r0 -= r8
17: (77) r7 >>= 2
18: (57) r7 &= 60
19: (1f) r0 -= r7
20: (67) r0 <<= 32
21: (77) r0 >>= 32
22: (b7) r1 = 7
23: (2d) if r1 > r0 goto pc+75
 R0_w=inv(id=0,umin_value=7,umax_value=4294967295,var_off=(0x0; 0xffffffff)) R1_w=inv7 R6=ctx(id=0,off=0,imm=0) R7_w=inv(id=0,umax_value=60,var_off=(0x0; 0x3c)) R8=inv(id=0,umin_value=20,umax_value=60,var_off=(0x0; 0x3c)) R10=fp0
24: (0f) r7 += r8
25: (bf) r9 = r7
26: (07) r9 += 12
27: (07) r7 += 20
28: (bf) r8 = r9
29: (47) r8 |= 2
30: (50) r0 = *(u8 *)skb[r8 + 0]
31: (bf) r3 = r0
32: (2d) if r7 > r8 goto pc+9
 R0=inv(id=0) R3=inv(id=0) R6=ctx(id=0,off=0,imm=0) R7=inv(id=0,umin_value=40,umax_value=140,var_off=(0x0; 0xfc)) R8=inv(id=0,umin_value=32,umax_value=254,var_off=(0x2; 0xfc)) R9=inv(id=0,umin_value=32,umax_value=132,var_off=(0x0; 0xfc)) R10=fp0
33: (65) if r3 s> 0x47 goto pc+33
 R0=inv(id=0) R3=inv(id=0,smax_value=71) R6=ctx(id=0,off=0,imm=0) R7=inv(id=0,umin_value=40,umax_value=140,var_off=(0x0; 0xfc)) R8=inv(id=0,umin_value=32,umax_value=254,var_off=(0x2; 0xfc)) R9=inv(id=0,umin_value=32,umax_value=132,var_off=(0x0; 0xfc)) R10=fp0
34: (15) if r3 == 0x44 goto pc+41
 R0=inv(id=0) R3=inv(id=0,smax_value=71) R6=ctx(id=0,off=0,imm=0) R7=inv(id=0,umin_value=40,umax_value=140,var_off=(0x0; 0xfc)) R8=inv(id=0,umin_value=32,umax_value=254,var_off=(0x2; 0xfc)) R9=inv(id=0,umin_value=32,umax_value=132,var_off=(0x0; 0xfc)) R10=fp0
35: (15) if r3 == 0x47 goto pc+1

from 35 to 37: R0=inv(id=0) R3=inv71 R6=ctx(id=0,off=0,imm=0) R7=inv(id=0,umin_value=40,umax_value=140,var_off=(0x0; 0xfc)) R8=inv(id=0,umin_value=32,umax_value=254,var_off=(0x2; 0xfc)) R9=inv(id=0,umin_value=32,umax_value=132,var_off=(0x0; 0xfc)) R10=fp0
37: (55) if r2 != 0x54 goto pc+61
R2 !read_ok
processed 41 insns (limit 1000000) max_states_per_insn 0 total_states 3 peak_states 3 mark_read 1

Traceback (most recent call last):
  File "http-parse-sample.py", line 77, in <module>
    function_http_filter = bpf.load_func("http_filter", BPF.SOCKET_FILTER)
  File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 413, in load_func
    (func_name, errstr))
Exception: Failed to load BPF program http_filter: Permission denied

Here is my environment:

$ uname -a
Linux desktop 5.8.0-48-generic #54~20.04.1-Ubuntu SMP Sat Mar 20 13:40:25 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Check this issue : iovisor/bcc#2035

and this commit : iovisor/bcc@60b0166

Thanks

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