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[nss_nonlocal.git] / nonlocal-passwd.c

diff --git a/nonlocal-passwd.c b/nonlocal-passwd.c
index 2810e1676841406fe4dd1b5b7059d696bec1792c..e915ea0a2fa15d4b1ffe22f1812e8781806a19f7 100644 (file)
--- a/nonlocal-passwd.c
+++ b/nonlocal-passwd.c
@@ -43,7 +43,13 @@
 #include "nsswitch-internal.h"
 #include "nonlocal.h"
 
-#define MAGIC_LOCAL_PW_BUFLEN (sysconf(_SC_GETPW_R_SIZE_MAX) + 7)
+
+enum nss_status
+_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
+                        char *buffer, size_t buflen, int *errnop);
+enum nss_status
+_nss_nonlocal_getpwnam_r(const char *name, struct passwd *pwd,
+                        char *buffer, size_t buflen, int *errnop);
 
 
 static service_user *
@@ -72,7 +78,8 @@ check_nonlocal_uid(const char *user, uid_t uid, int *errnop)
     } fct;
     struct passwd pwbuf;
     int old_errno = errno;
-    int buflen = MAGIC_LOCAL_PW_BUFLEN;
+
+    size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
     char *buf = malloc(buflen);
     if (buf == NULL) {
        *errnop = ENOMEM;
@@ -88,9 +95,22 @@ check_nonlocal_uid(const char *user, uid_t uid, int *errnop)
     nip = startp;
     fct.ptr = fct_start;
     do {
-       status = DL_CALL_FCT(fct.l, (uid, &pwbuf, buf, buflen, errnop));
-       if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
-           break;
+    morebuf:
+       if (fct.l == _nss_nonlocal_getpwuid_r)
+           status = NSS_STATUS_NOTFOUND;
+       else
+           status = DL_CALL_FCT(fct.l, (uid, &pwbuf, buf, buflen, errnop));
+       if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
+           free(buf);
+           buflen *= 2;
+           buf = malloc(buflen);
+           if (buf == NULL) {
+               *errnop = ENOMEM;
+               errno = old_errno;
+               return NSS_STATUS_TRYAGAIN;
+           }
+           goto morebuf;
+       }
     } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
 
     if (status == NSS_STATUS_SUCCESS) {
@@ -119,7 +139,8 @@ check_nonlocal_user(const char *user, int *errnop)
     } fct;
     struct passwd pwbuf;
     int old_errno = errno;
-    int buflen = MAGIC_LOCAL_PW_BUFLEN;
+
+    size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
     char *buf = malloc(buflen);
     if (buf == NULL) {
        *errnop = ENOMEM;
@@ -135,9 +156,22 @@ check_nonlocal_user(const char *user, int *errnop)
     nip = startp;
     fct.ptr = fct_start;
     do {
-       status = DL_CALL_FCT(fct.l, (user, &pwbuf, buf, buflen, errnop));
-       if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
-           break;
+    morebuf:
+       if (fct.l == _nss_nonlocal_getpwnam_r)
+           status = NSS_STATUS_NOTFOUND;
+       else
+           status = DL_CALL_FCT(fct.l, (user, &pwbuf, buf, buflen, errnop));
+       if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
+           free(buf);
+           buflen *= 2;
+           buf = malloc(buflen);
+           if (buf == NULL) {
+               *errnop = ENOMEM;
+               errno = old_errno;
+               return NSS_STATUS_TRYAGAIN;
+           }
+           goto morebuf;
+       }
     } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
 
     if (status == NSS_STATUS_SUCCESS)
@@ -229,8 +263,7 @@ _nss_nonlocal_getpwent_r(struct passwd *pwd, char *buffer, size_t buflen,
     enum nss_status status;
 
     char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
-    if (buflen == MAGIC_LOCAL_PW_BUFLEN ||
-       (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
+    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
        return NSS_STATUS_UNAVAIL;
 
     if (pwent_nip == NULL) {
@@ -276,8 +309,7 @@ _nss_nonlocal_getpwnam_r(const char *name, struct passwd *pwd,
     int group_errno;
 
     char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
-    if (buflen == MAGIC_LOCAL_PW_BUFLEN ||
-       (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
+    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
        return NSS_STATUS_UNAVAIL;
 
     nip = nss_passwd_nonlocal_database();
@@ -323,8 +355,7 @@ _nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
     int group_errno;
 
     char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
-    if (buflen == MAGIC_LOCAL_PW_BUFLEN ||
-       (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
+    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
        return NSS_STATUS_UNAVAIL;
 
     nip = nss_passwd_nonlocal_database();