[Minios-devel] [UNIKRAFT PATCH 1/1] lib/ukunistd: Imlement getpwnam, getpwuid and getpwent

[Vlad-Andrei BĂDOIU (78692) <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>]

Our implementation uses a list for the password database. Since we have no shell
available on Unikraft, the pw_shell field is set to NULL.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>
---
 lib/ukunistd/user.c | 77 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 66 insertions(+), 11 deletions(-)

diff --git a/lib/ukunistd/user.c b/lib/ukunistd/user.c
index 8fe991e4..9d39aed8 100644
--- a/lib/ukunistd/user.c
+++ b/lib/ukunistd/user.c
@@ -35,8 +35,39 @@
 
 #include <unistd.h>
 #include <pwd.h>
+#include <string.h>
 #include <sys/types.h>
 #include <uk/essentials.h>
+#include <uk/list.h>
+
+static struct passwd_entry {
+       struct passwd *passwd;
+
+       UK_SLIST_ENTRY(struct passwd_entry) entries;
+} *iter;
+
+UK_SLIST_HEAD(uk_entry_list, struct passwd_entry);
+
+static struct uk_entry_list passwds;
+
+void __constructor init_ukunistd()
+{
+       static struct passwd_entry p1;
+       static struct passwd passwd = {
+               .pw_name = "root",
+               .pw_passwd = "password",
+               .pw_uid = 0,
+               .pw_gid = 0,
+               .pw_gecos = "root",
+               .pw_dir = "/",
+               .pw_shell = NULL,
+       };
+
+       p1.passwd = &passwd;
+
+       UK_SLIST_INIT(&passwds);
+       UK_SLIST_INSERT_HEAD(&passwds, &p1, entries);
+}
 
 uid_t getuid(void)
 {
@@ -78,14 +109,37 @@ char *getlogin(void)
        return 0;
 }
 
-struct passwd *getpwnam(const char *name __unused)
+void setpwent(void)
+{
+       iter = UK_SLIST_FIRST(&passwds);
+}
+
+void endpwent(void)
+{
+}
+
+struct passwd *getpwnam(const char *name)
 {
-       return NULL;
+       struct passwd *pwd;
+
+       setpwent();
+       while ((pwd = getpwent()) && strcmp(pwd->pw_name, name))
+               ;
+       endpwent();
+
+       return pwd;
 }
 
-struct passwd *getpwuid(uid_t uid __unused)
+struct passwd *getpwuid(uid_t uid)
 {
-       return NULL;
+       struct passwd *pwd;
+
+       setpwent();
+       while ((pwd = getpwent()) && pwd->pw_uid != uid)
+               ;
+       endpwent();
+
+       return pwd;
 }
 
 int getpwnam_r(const char *name __unused, struct passwd *pwd __unused,
@@ -104,15 +158,16 @@ int getpwuid_r(uid_t uid __unused, struct passwd *pwd 
__unused,
 
 struct passwd *getpwent(void)
 {
-       return NULL;
-}
+       struct passwd *pwd;
+       
+       if (iter == NULL)
+               return NULL;
 
-void setpwent(void)
-{
-}
+       pwd = iter->passwd;
 
-void endpwent(void)
-{
+       iter = UK_SLIST_NEXT(iter, entries);
+
+       return pwd;
 }
 
 gid_t getgid(void)
-- 
2.20.1


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