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Diffstat (limited to 'nis/nss_compat/compat-grp.c')
-rw-r--r--nis/nss_compat/compat-grp.c314
1 files changed, 290 insertions, 24 deletions
diff --git a/nis/nss_compat/compat-grp.c b/nis/nss_compat/compat-grp.c
index c0ddbdffdf..a460d8a8ef 100644
--- a/nis/nss_compat/compat-grp.c
+++ b/nis/nss_compat/compat-grp.c
@@ -29,6 +29,10 @@
#include <rpcsvc/nis.h>
#include <nsswitch.h>
+/* Comment out the following line for the production version. */
+/* #define NDEBUG 1 */
+#include <assert.h>
+
#include "nss-nisplus.h"
#include "nisplus-parser.h"
@@ -41,7 +45,7 @@ static size_t grptablelen = 0;
#define ENTNAME grent
#define STRUCTURE group
#define EXTERN_PARSER
-#include "../../nss/nss_files/files-parse.c"
+#include <nss/nss_files/files-parse.c>
/* Structure for remembering -group members ... */
#define BLACKLIST_INITIAL_SIZE 512
@@ -85,15 +89,22 @@ _nss_first_init (void)
if (grptable == NULL)
{
- char buf [20 + strlen (nis_local_directory ())];
- char *p;
+ static const char key[] = "group.org_dir.";
+ const char *local_dir = nis_local_directory ();
+ size_t len_local_dir = strlen (local_dir);
- p = stpcpy (buf, "group.org_dir.");
- p = stpcpy (p, nis_local_directory ());
- grptable = strdup (buf);
+ grptable = malloc (sizeof (key) + len_local_dir);
if (grptable == NULL)
return NSS_STATUS_TRYAGAIN;
- grptablelen = strlen (grptable);
+
+ grptablelen = ((char *) mempcpy (mempcpy (grptable,
+ key, sizeof (key) - 1),
+ local_dir, len_local_dir + 1)
+ - grptable) - 1;
+
+ /* *Maybe* (I'm no NIS expert) we have to duplicate the `local_dir'
+ value since it might change during our work. So add a test here. */
+ assert (grptablelen == sizeof (key) + len_local_dir);
}
return NSS_STATUS_SUCCESS;
@@ -370,8 +381,8 @@ getgrent_next_nisplus (struct group *result, ent_t *ent, char *buffer,
/* This function handle the +group entrys in /etc/group */
static enum nss_status
-getgrent_next_file_plusgroup (struct group *result, char *buffer,
- size_t buflen)
+getgrnam_plusgroup (const char *name, struct group *result, char *buffer,
+ size_t buflen)
{
struct parser_data *data = (void *) buffer;
int parse_res;
@@ -379,9 +390,9 @@ getgrent_next_file_plusgroup (struct group *result, char *buffer,
if (use_nisplus) /* Do the NIS+ query here */
{
nis_result *res;
- char buf[strlen (result->gr_name) + 24 + grptablelen];
+ char buf[strlen (name) + 24 + grptablelen];
- sprintf(buf, "[name=%s],%s", &result->gr_name[1], grptable);
+ sprintf(buf, "[name=%s],%s", name, grptable);
res = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
{
@@ -407,9 +418,8 @@ getgrent_next_file_plusgroup (struct group *result, char *buffer,
if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
return NSS_STATUS_TRYAGAIN;
- if (yp_match (domain, "group.byname", &result->gr_name[1],
- strlen (result->gr_name) - 1, &outval, &outvallen)
- != YPERR_SUCCESS)
+ if (yp_match (domain, "group.byname", name, strlen (name),
+ &outval, &outvallen) != YPERR_SUCCESS)
return NSS_STATUS_TRYAGAIN;
p = strncpy (buffer, outval,
buflen < (size_t) outvallen ? buflen : (size_t) outvallen);
@@ -430,7 +440,6 @@ getgrent_next_file_plusgroup (struct group *result, char *buffer,
return NSS_STATUS_RETURN;
}
-
static enum nss_status
getgrent_next_file (struct group *result, ent_t *ent,
char *buffer, size_t buflen)
@@ -495,7 +504,11 @@ getgrent_next_file (struct group *result, ent_t *ent,
{
enum nss_status status;
- status = getgrent_next_file_plusgroup (result, buffer, buflen);
+ /* Store the group in the blacklist for the "+" at the end of
+ /etc/group */
+ blacklist_store_name (&result->gr_name[1], ent);
+ status = getgrnam_plusgroup (&result->gr_name[1], result, buffer,
+ buflen);
if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
break;
else
@@ -556,6 +569,104 @@ _nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen)
return status;
}
+/* Searches in /etc/group and the NIS/NIS+ map for a special group */
+static enum nss_status
+internal_getgrnam_r (const char *name, struct group *result, ent_t *ent,
+ char *buffer, size_t buflen)
+{
+ struct parser_data *data = (void *) buffer;
+ while (1)
+ {
+ fpos_t pos;
+ int parse_res = 0;
+ char *p;
+
+ do
+ {
+ fgetpos (ent->stream, &pos);
+ p = fgets (buffer, buflen, ent->stream);
+ if (p == NULL)
+ {
+ if (feof (ent->stream))
+ return NSS_STATUS_NOTFOUND;
+ else
+ {
+ __set_errno (ERANGE);
+ return NSS_STATUS_TRYAGAIN;
+ }
+ }
+
+ /* Terminate the line for any case. */
+ buffer[buflen - 1] = '\0';
+
+ /* Skip leading blanks. */
+ while (isspace (*p))
+ ++p;
+ }
+ while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
+ /* Parse the line. If it is invalid, loop to
+ get the next line of the file to parse. */
+ !(parse_res = _nss_files_parse_grent (p, result, data, buflen)));
+
+ if (parse_res == -1)
+ {
+ /* The parser ran out of space. */
+ fsetpos (ent->stream, &pos);
+ __set_errno (ERANGE);
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ /* This is a real entry. */
+ if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
+ {
+ if (strcmp (result->gr_name, name) == 0)
+ return NSS_STATUS_SUCCESS;
+ else
+ continue;
+ }
+
+ /* -group */
+ if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
+ && result->gr_name[1] != '@')
+ {
+ if (strcmp (&result->gr_name[1], name) == 0)
+ return NSS_STATUS_NOTFOUND;
+ else
+ continue;
+ }
+
+ /* +group */
+ if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
+ && result->gr_name[1] != '@')
+ {
+ if (strcmp (name, &result->gr_name[1]) == 0)
+ {
+ enum nss_status status;
+
+ status = getgrnam_plusgroup (name, result, buffer, buflen);
+ if (status == NSS_STATUS_RETURN)
+ /* We couldn't parse the entry */
+ continue;
+ else
+ return status;
+ }
+ }
+ /* +:... */
+ if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
+ {
+ enum nss_status status;
+
+ status = getgrnam_plusgroup (name, result, buffer, buflen);
+ if (status == NSS_STATUS_RETURN)
+ /* We couldn't parse the entry */
+ continue;
+ else
+ return status;
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
enum nss_status
_nss_compat_getgrnam_r (const char *name, struct group *grp,
@@ -576,15 +687,172 @@ _nss_compat_getgrnam_r (const char *name, struct group *grp,
if (status != NSS_STATUS_SUCCESS)
return status;
- while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
- == NSS_STATUS_SUCCESS)
- if (strcmp (grp->gr_name, name) == 0)
- break;
+ status = internal_getgrnam_r (name, grp, &ent, buffer, buflen);
internal_endgrent (&ent);
+
return status;
}
+/* This function handle the + entry in /etc/group */
+static enum nss_status
+getgrgid_plusgroup (gid_t gid, struct group *result, char *buffer,
+ size_t buflen)
+{
+ struct parser_data *data = (void *) buffer;
+ int parse_res;
+
+ if (use_nisplus) /* Do the NIS+ query here */
+ {
+ nis_result *res;
+ char buf[1024 + grptablelen];
+
+ sprintf(buf, "[gid=%d],%s", gid, grptable);
+ res = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+ if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
+ {
+ enum nss_status status = niserr2nss (res->status);
+
+ nis_freeresult (res);
+ return status;
+ }
+ if ((parse_res = _nss_nisplus_parse_grent (res, 0, result, buffer,
+ buflen)) == -1)
+ {
+ __set_errno (ERANGE);
+ nis_freeresult (res);
+ return NSS_STATUS_TRYAGAIN;
+ }
+ nis_freeresult (res);
+ }
+ else /* Use NIS */
+ {
+ char buf[1024];
+ char *domain, *outval, *p;
+ int outvallen;
+
+ if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
+ return NSS_STATUS_TRYAGAIN;
+
+ snprintf (buf, sizeof (buf), "%d", gid);
+
+ if (yp_match (domain, "group.bygid", buf, strlen (buf),
+ &outval, &outvallen) != YPERR_SUCCESS)
+ return NSS_STATUS_TRYAGAIN;
+ p = strncpy (buffer, outval,
+ buflen < (size_t) outvallen ? buflen : (size_t) outvallen);
+ free (outval);
+ while (isspace (*p))
+ p++;
+ if ((parse_res = _nss_files_parse_grent (p, result, data, buflen)) == -1)
+ {
+ __set_errno (ERANGE);
+ return NSS_STATUS_TRYAGAIN;
+ }
+ }
+
+ if (parse_res)
+ /* We found the entry. */
+ return NSS_STATUS_SUCCESS;
+ else
+ return NSS_STATUS_RETURN;
+}
+
+/* Searches in /etc/group and the NIS/NIS+ map for a special group id */
+static enum nss_status
+internal_getgrgid_r (gid_t gid, struct group *result, ent_t *ent,
+ char *buffer, size_t buflen)
+{
+ struct parser_data *data = (void *) buffer;
+ while (1)
+ {
+ fpos_t pos;
+ int parse_res = 0;
+ char *p;
+
+ do
+ {
+ fgetpos (ent->stream, &pos);
+ p = fgets (buffer, buflen, ent->stream);
+ if (p == NULL)
+ {
+ if (feof (ent->stream))
+ return NSS_STATUS_NOTFOUND;
+ else
+ {
+ __set_errno (ERANGE);
+ return NSS_STATUS_TRYAGAIN;
+ }
+ }
+
+ /* Terminate the line for any case. */
+ buffer[buflen - 1] = '\0';
+
+ /* Skip leading blanks. */
+ while (isspace (*p))
+ ++p;
+ }
+ while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
+ /* Parse the line. If it is invalid, loop to
+ get the next line of the file to parse. */
+ !(parse_res = _nss_files_parse_grent (p, result, data, buflen)));
+
+ if (parse_res == -1)
+ {
+ /* The parser ran out of space. */
+ fsetpos (ent->stream, &pos);
+ __set_errno (ERANGE);
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ /* This is a real entry. */
+ if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
+ {
+ if (result->gr_gid == gid)
+ return NSS_STATUS_SUCCESS;
+ else
+ continue;
+ }
+
+ /* -group */
+ if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
+ && result->gr_name[1] != '@')
+ {
+ blacklist_store_name (&result->gr_name[1], ent);
+ continue;
+ }
+
+ /* +group */
+ if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
+ && result->gr_name[1] != '@')
+ {
+ enum nss_status status;
+
+ /* Store the group in the blacklist for the "+" at the end of
+ /etc/group */
+ blacklist_store_name (&result->gr_name[1], ent);
+ status = getgrnam_plusgroup (&result->gr_name[1], result, buffer,
+ buflen);
+ if (status == NSS_STATUS_SUCCESS && result->gr_gid == gid)
+ break;
+ else
+ continue;
+ }
+ /* +:... */
+ if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
+ {
+ enum nss_status status;
+
+ status = getgrgid_plusgroup (gid, result, buffer, buflen);
+ if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
+ return NSS_STATUS_NOTFOUND;
+ else
+ return status;
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
+}
enum nss_status
_nss_compat_getgrgid_r (gid_t gid, struct group *grp,
@@ -602,12 +870,10 @@ _nss_compat_getgrgid_r (gid_t gid, struct group *grp,
if (status != NSS_STATUS_SUCCESS)
return status;
- while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
- == NSS_STATUS_SUCCESS)
- if (grp->gr_gid == gid && grp->gr_name[0] != '+' && grp->gr_name[0] != '-')
- break;
+ status = internal_getgrgid_r (gid, grp, &ent, buffer, buflen);
internal_endgrent (&ent);
+
return status;
}
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