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introduce HERMIT_CAPTURE_NET to capture the network traffic

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This commit is contained in:
Stefan Lankes 2017-02-19 10:56:24 +01:00
parent 182999e0b7
commit d18a6a72a5
2 changed files with 14 additions and 6 deletions
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4
README.md
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@ -153,6 +153,8 @@ For network support, you have to link the Go application with the flag `-lnetgo`
2. If Qemu is started by our proxy and the environment variable `HERMIT_KVM` is set to `0`, the virtual machine will be not accelerated by KVM.
In this case, the configuration flag `--with-mtune=name` should be avoided.
With the environment variable `HERMIT_APP_PORT`, an additional port can be open to establish an TCP/IP connection with your application.
3. By setting the environment variable `HERMIT_VERBOSE` to `1`, the proxy prints at termination the kernel log messages onto the screen.
3. By setting the environment variable `HERMIT_VERBOSE` to `1`, the proxy prints at termination the kernel log messages onto the screen.
4. If `HERMIT_DEBUG` is set to `1`, Qemu will establish an gdbserver, which will be listen port 1234.
Afterwards you are able debug HermitCore applications remotely.
5. By setting the environment variable `HERMIT_CAPTURE_NET' to `1` and `HERMIT_ISLE` to `qemu`, Qemu captures the network traffic and
creates the trace file *qemu-vlan0.pcap*. For instance with [Wireshark](https://www.wireshark.org) you are able to analyze the file.

16
tools/proxy.c
View file

@ -393,6 +393,17 @@ static int init_qemu(char *path)
qemu_argv[i] = "-s";
}
str = getenv("HERMIT_CAPTURE_NET");
if (str && (strcmp(str, "0") != 0))
{
for(i=0; qemu_argv[i] != NULL; i++)
;
// add flags to capture the network traffic
qemu_argv[i] = "-net";
qemu_argv[i+1] = "dump";
}
str = getenv("HERMIT_VERBOSE");
if (str && (strcmp(str, "0") != 0))
{
@ -401,11 +412,6 @@ static int init_qemu(char *path)
for(i=0; qemu_argv[i] != NULL; i++)
printf("%s ", qemu_argv[i]);
// add flags to create dump of the network traffic
//qemu_argv[i] = "-net";
//qemu_argv[i+1] = "dump";
//printf("%s %s\n", qemu_argv[i], qemu_argv[i+1]);
fflush(stdout);
}