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mptcpize: set GODEBUG=multipathtcp=1 env var #316

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merged 1 commit into from
Jan 27, 2025
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mptcpize: set GODEBUG=multipathtcp=1 env var #316

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22 changes: 19 additions & 3 deletions src/mptcpize.c
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,8 @@
#define SYSTEMCTL_SHOW "systemctl show -p FragmentPath "
#define PRELOAD_VAR "LD_PRELOAD="
#define MPTCPWRAP_ENV PKGLIBDIR"/libmptcpwrap.so.0.0."LIBREVISION
#define GODEBUG_VAR "GODEBUG="
#define MPTCPGO_ENV "multipathtcp=1"

/* Program documentation. */
static char args_doc[] = "CMD";
Expand Down Expand Up @@ -62,7 +64,7 @@ static void help(void)

static int run(int argc, char *av[])
{
int i, nr = 0, ld, debug = 0;
int i, nr = 0, ld, go, debug = 0;
char **envp, **argv, *env;
size_t len;

Expand All @@ -81,18 +83,22 @@ static int run(int argc, char *av[])
// build environment, copying the current one ...
while (environ[nr])
nr++;
envp = calloc(nr + 3, sizeof(char *));
envp = calloc(nr + 4, sizeof(char *));
if (!envp)
error(1, errno, "can't allocate env list");

// ... filtering out any 'LD_PRELOAD' ...
// ... filtering out any 'LD_PRELOAD' and 'GODEBUG' ...
nr = 0;
i = 0;
ld = -1;
go = -1;
while (environ[nr]) {
if (strncmp(environ[nr], PRELOAD_VAR,
strlen(PRELOAD_VAR)) == 0) {
ld = nr;
} else if (strncmp(environ[nr], GODEBUG_VAR,
strlen(GODEBUG_VAR)) == 0) {
go = nr;
} else {
envp[i] = environ[nr];
i++;
Expand All @@ -110,6 +116,16 @@ static int run(int argc, char *av[])
}
envp[i++] = env;

// .. and GODEBUG=multipathtcp=1 ...
if (go >= 0) {
len = strlen(environ[go]) + strlen(MPTCPGO_ENV) + 2;
env = alloca(len);
snprintf(env, len, "%s,%s", environ[go], MPTCPGO_ENV);
} else {
env = GODEBUG_VAR MPTCPGO_ENV;
}
envp[i++] = env;

// ... and enable dbg if needed
if (debug)
envp[i++] = "MPTCPWRAP_DEBUG=1";
Expand Down
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