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/*
* shim_posix.c — the few POSIX entry points anthy calls that WASI does not provide.
*
* Measured on the wasi-sdk-25 sysroot: libc.a defines neither getuid, getpwuid nor
* gethostname, while anthy uses getpwuid(getuid()) in conf.c and gethostname() when
* it builds the session id. Linking without these fails with undefined symbols.
*
* Nothing here is security relevant: the module runs inside the embedder's own
* process, HOME only decides where anthy looks for the private dictionary, and the
* session id only has to be unique within the process.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "pwd.h"
uid_t getuid(void)
{
return 0;
}
uid_t geteuid(void)
{
return 0;
}
static struct passwd fake_pw;
static char home_dir[512];
struct passwd *getpwuid(uid_t uid)
{
const char *h;
(void)uid;
h = getenv("HOME");
snprintf(home_dir, sizeof(home_dir), "%s", (h && *h) ? h : "/work");
fake_pw.pw_name = (char *)"wasm";
fake_pw.pw_passwd = (char *)"";
fake_pw.pw_uid = 0;
fake_pw.pw_gid = 0;
fake_pw.pw_gecos = (char *)"";
fake_pw.pw_dir = home_dir;
fake_pw.pw_shell = (char *)"/";
return &fake_pw;
}
struct passwd *getpwnam(const char *name)
{
(void)name;
return getpwuid(0);
}
/* declared in <unistd.h>, but the definition is missing from libc.a */
int gethostname(char *name, size_t len)
{
if (!name || len == 0)
return -1;
snprintf(name, len, "wasm");
return 0;
}
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