[PATCH 0/4] cfgfile: enhance error detecting

[PATCH 0/4] cfgfile: enhance error detecting

[Chengwen Feng]

When I was trying to debug a problem introduced by config.ini in
test-dma-perf, I found the cfgfile library should enhance error
detecting, so got this patchset.

Chengwen Feng (4):
  cfgfile: remove dead code
  cfgfile: support verify name and value
  cfgfile: verify add section and entry result
  cfgfile: add unique name flag

 lib/cfgfile/rte_cfgfile.c | 70 +++++++++++++++++++++++++++++----------
 lib/cfgfile/rte_cfgfile.h |  7 ++++
 2 files changed, 59 insertions(+), 18 deletions(-)

-- 
2.17.1

[PATCH 1/4] cfgfile: remove dead code

[Chengwen Feng]

This memchr() will never return NULL because rte_cfgfile_load() function
will skip lines without useful content.

Fixes: 74e0d3a17461 ("cfgfile: fix null pointer dereference in parsing")
Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/cfgfile/rte_cfgfile.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index 6a5e4fd942..d7aa38b56f 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -223,12 +223,6 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 
 			split[0] = buffer;
 			split[1] = memchr(buffer, '=', len);
-			if (split[1] == NULL) {
-				CFG_LOG(ERR,
-					"line %d - no '=' character found",
-					lineno);
-				goto error1;
-			}
 			*split[1] = '\0';
 			split[1]++;
 
-- 
2.17.1

[PATCH 2/4] cfgfile: support verify name and value

[Chengwen Feng]

This patch supports verify section's name, entry's name and entry's
value validity.

Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/cfgfile/rte_cfgfile.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index d7aa38b56f..6f8f46a406 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -105,6 +105,16 @@ static int
 _add_entry(struct rte_cfgfile_section *section, const char *entryname,
 		const char *entryvalue)
 {
+	int name_len, value_len;
+
+	name_len = strlen(entryname);
+	value_len = strlen(entryvalue);
+	if (name_len == 0 || name_len >= CFG_NAME_LEN || value_len >= CFG_VALUE_LEN) {
+		CFG_LOG(ERR, "invalid entry name %s or value %s in section %s",
+			entryname, entryvalue, section->name);
+		return -EINVAL;
+	}
+
 	/* resize entry structure if we don't have room for more entries */
 	if (section->num_entries == section->allocated_entries) {
 		struct rte_cfgfile_entry *n_entries = realloc(
@@ -322,6 +332,7 @@ rte_cfgfile_create(int flags)
 int
 rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 {
+	int len;
 	int i;
 
 	if (cfg == NULL)
@@ -330,6 +341,12 @@ rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 	if (sectionname == NULL)
 		return -EINVAL;
 
+	len = strlen(sectionname);
+	if (len == 0 || len >= CFG_NAME_LEN) {
+		CFG_LOG(ERR, "invalid section name %s", sectionname);
+		return -EINVAL;
+	}
+
 	/* resize overall struct if we don't have room for more	sections */
 	if (cfg->num_sections == cfg->allocated_sections) {
 
-- 
2.17.1

[PATCH 3/4] cfgfile: verify add section and entry result

[Chengwen Feng]

The rte_cfgfile_add_section() and _add_entry()'s result were not
verified, so that potential errors may not be detected.

This commit adds the verification.

Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/cfgfile/rte_cfgfile.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index 6f8f46a406..ad9314dc14 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -182,6 +182,7 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 	char buffer[CFG_NAME_LEN + CFG_VALUE_LEN + 4];
 	int lineno = 0;
 	struct rte_cfgfile *cfg;
+	int ret;
 
 	if (rte_cfgfile_check_params(params))
 		return NULL;
@@ -226,7 +227,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			*end = '\0';
 			_strip(&buffer[1], end - &buffer[1]);
 
-			rte_cfgfile_add_section(cfg, &buffer[1]);
+			ret = rte_cfgfile_add_section(cfg, &buffer[1]);
+			if (ret != 0)
+				goto error1;
 		} else {
 			/* key and value line */
 			char *split[2] = {NULL};
@@ -261,8 +264,10 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			if (cfg->num_sections == 0)
 				goto error1;
 
-			_add_entry(&cfg->sections[cfg->num_sections - 1],
-					split[0], split[1]);
+			ret = _add_entry(&cfg->sections[cfg->num_sections - 1],
+					 split[0], split[1]);
+			if (ret != 0)
+				goto error1;
 		}
 	}
 	fclose(f);
@@ -277,6 +282,7 @@ struct rte_cfgfile *
 rte_cfgfile_create(int flags)
 {
 	int i;
+	int ret;
 	struct rte_cfgfile *cfg;
 
 	/* future proof flags usage */
@@ -310,8 +316,11 @@ rte_cfgfile_create(int flags)
 		cfg->sections[i].allocated_entries = CFG_ALLOC_ENTRY_BATCH;
 	}
 
-	if (flags & CFG_FLAG_GLOBAL_SECTION)
-		rte_cfgfile_add_section(cfg, "GLOBAL");
+	if (flags & CFG_FLAG_GLOBAL_SECTION) {
+		ret = rte_cfgfile_add_section(cfg, "GLOBAL");
+		if (ret != 0)
+			goto error1;
+	}
 
 	return cfg;
 error1:
-- 
2.17.1

[PATCH 4/4] cfgfile: add unique name flag

[Chengwen Feng]

The cfgfile supports duplicate section name and entry name when parsing
config file, which may confused and hard to debug when accidentally set
duplicate name.

So add unique name flag, it will treat as error if encounter duplicate
section name or entry name.

Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/cfgfile/rte_cfgfile.c | 32 +++++++++++++++++++++++---------
 lib/cfgfile/rte_cfgfile.h |  7 +++++++
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index ad9314dc14..9e901b0977 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -102,8 +102,8 @@ _get_section(struct rte_cfgfile *cfg, const char *sectionname)
 }
 
 static int
-_add_entry(struct rte_cfgfile_section *section, const char *entryname,
-		const char *entryvalue)
+_add_entry(struct rte_cfgfile *cfg, struct rte_cfgfile_section *section,
+	   const char *entryname, const char *entryvalue, bool check_dup)
 {
 	int name_len, value_len;
 
@@ -115,6 +115,14 @@ _add_entry(struct rte_cfgfile_section *section, const char *entryname,
 		return -EINVAL;
 	}
 
+	if (check_dup) {
+		if (rte_cfgfile_has_entry(cfg, section->name, entryname) != 0) {
+			CFG_LOG(ERR, "duplicate entry name %s in section %s",
+				entryname, section->name);
+			return -EEXIST;
+		}
+	}
+
 	/* resize entry structure if we don't have room for more entries */
 	if (section->num_entries == section->allocated_entries) {
 		struct rte_cfgfile_entry *n_entries = realloc(
@@ -264,8 +272,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			if (cfg->num_sections == 0)
 				goto error1;
 
-			ret = _add_entry(&cfg->sections[cfg->num_sections - 1],
-					 split[0], split[1]);
+			ret = _add_entry(cfg, &cfg->sections[cfg->num_sections - 1],
+					 split[0], split[1],
+					 !!(flags & CFG_FLAG_UNIQUE_NAME));
 			if (ret != 0)
 				goto error1;
 		}
@@ -286,7 +295,8 @@ rte_cfgfile_create(int flags)
 	struct rte_cfgfile *cfg;
 
 	/* future proof flags usage */
-	if (flags & ~(CFG_FLAG_GLOBAL_SECTION | CFG_FLAG_EMPTY_VALUES))
+	if (flags & ~(CFG_FLAG_GLOBAL_SECTION | CFG_FLAG_EMPTY_VALUES |
+		      CFG_FLAG_UNIQUE_NAME))
 		return NULL;
 
 	cfg = malloc(sizeof(*cfg));
@@ -356,6 +366,13 @@ rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 		return -EINVAL;
 	}
 
+	if (cfg->flags & CFG_FLAG_UNIQUE_NAME) {
+		if (rte_cfgfile_has_section(cfg, sectionname) != 0) {
+			CFG_LOG(ERR, "duplicate section name %s", sectionname);
+			return -EEXIST;
+		}
+	}
+
 	/* resize overall struct if we don't have room for more	sections */
 	if (cfg->num_sections == cfg->allocated_sections) {
 
@@ -396,16 +413,13 @@ int rte_cfgfile_add_entry(struct rte_cfgfile *cfg,
 			|| (entryvalue == NULL))
 		return -EINVAL;
 
-	if (rte_cfgfile_has_entry(cfg, sectionname, entryname) != 0)
-		return -EEXIST;
-
 	/* search for section pointer by sectionname */
 	struct rte_cfgfile_section *curr_section = _get_section(cfg,
 								sectionname);
 	if (curr_section == NULL)
 		return -EINVAL;
 
-	ret = _add_entry(curr_section, entryname, entryvalue);
+	ret = _add_entry(cfg, curr_section, entryname, entryvalue, true);
 
 	return ret;
 }
diff --git a/lib/cfgfile/rte_cfgfile.h b/lib/cfgfile/rte_cfgfile.h
index 232c65c77b..74057c1b73 100644
--- a/lib/cfgfile/rte_cfgfile.h
+++ b/lib/cfgfile/rte_cfgfile.h
@@ -56,6 +56,13 @@ enum {
 	 * be zero length (e.g., "key=").
 	 */
 	CFG_FLAG_EMPTY_VALUES = 2,
+
+	/**
+	 * Indicates that file should have unique section name AND unique
+	 * entry's name. If a duplicate name is detected, the operation will
+	 * return error.
+	 */
+	CFG_FLAG_UNIQUE_NAME = 4,
 };
 /**@} */
 
-- 
2.17.1

Re: [PATCH 0/4] cfgfile: enhance error detecting

[David Marchand]

On Tue, Feb 20, 2024 at 5:00 AM Chengwen Feng <fengchengwen@huawei.com> wrote:
>
> When I was trying to debug a problem introduced by config.ini in
> test-dma-perf, I found the cfgfile library should enhance error
> detecting, so got this patchset.
>
> Chengwen Feng (4):
>   cfgfile: remove dead code
>   cfgfile: support verify name and value
>   cfgfile: verify add section and entry result
>   cfgfile: add unique name flag
>
>  lib/cfgfile/rte_cfgfile.c | 70 +++++++++++++++++++++++++++++----------
>  lib/cfgfile/rte_cfgfile.h |  7 ++++
>  2 files changed, 59 insertions(+), 18 deletions(-)

Please review.


-- 
David Marchand

Re: [PATCH 1/4] cfgfile: remove dead code

[Stephen Hemminger]

On Tue, 20 Feb 2024 03:58:37 +0000
Chengwen Feng <fengchengwen@huawei.com> wrote:

> This memchr() will never return NULL because rte_cfgfile_load() function
> will skip lines without useful content.
> 
> Fixes: 74e0d3a17461 ("cfgfile: fix null pointer dereference in parsing")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>

LGTM
Acked-by: Stephen Hemminger <stephen@networkplumber.org>

Re: [PATCH 2/4] cfgfile: support verify name and value

[Stephen Hemminger]

On Tue, 20 Feb 2024 03:58:38 +0000
Chengwen Feng <fengchengwen@huawei.com> wrote:

> This patch supports verify section's name, entry's name and entry's
> value validity.
> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>

Acked-by: Stephen Hemminger <stephen@networkplumber.org>

Re: [PATCH 3/4] cfgfile: verify add section and entry result

[Stephen Hemminger]

On Tue, 20 Feb 2024 03:58:39 +0000
Chengwen Feng <fengchengwen@huawei.com> wrote:

> The rte_cfgfile_add_section() and _add_entry()'s result were not
> verified, so that potential errors may not be detected.
> 
> This commit adds the verification.
> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>

Should add more tests as well.

Acked-by: Stephen Hemminger <stephen@networkplumber.org>

Re: [PATCH 4/4] cfgfile: add unique name flag

[Stephen Hemminger]

On Tue, 20 Feb 2024 03:58:40 +0000
Chengwen Feng <fengchengwen@huawei.com> wrote:

> The cfgfile supports duplicate section name and entry name when parsing
> config file, which may confused and hard to debug when accidentally set
> duplicate name.
> 
> So add unique name flag, it will treat as error if encounter duplicate
> section name or entry name.
> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>

https://en.wikipedia.org/wiki/INI_file

	Interpretation of multiple section declarations with the same name also varies. 
	In some implementations, duplicate sections simply merge their properties, as if
	they occurred contiguously. Others may abort, or ignore some aspect of the INI file.

The standard reference for INI file parsing on Linux is the Python configparser
https://docs.python.org/3/library/configparser.html

	strict, default value: True

	When set to True, the parser will not allow for any section or option duplicates while reading from a single source 	(using read_file(), read_string() or read_dict()). It is recommended to use strict parsers in new applications.

The problem I see is that cfgfile allows duplicates on names, and sections.
Perhaps there should be a new strict flag for this.

Re: [PATCH 0/4] cfgfile: enhance error detecting

[Stephen Hemminger]

On Tue, 20 Feb 2024 03:58:36 +0000
Chengwen Feng <fengchengwen@huawei.com> wrote:

> When I was trying to debug a problem introduced by config.ini in
> test-dma-perf, I found the cfgfile library should enhance error
> detecting, so got this patchset.
> 
> Chengwen Feng (4):
>   cfgfile: remove dead code
>   cfgfile: support verify name and value
>   cfgfile: verify add section and entry result
>   cfgfile: add unique name flag
> 
>  lib/cfgfile/rte_cfgfile.c | 70 +++++++++++++++++++++++++++++----------
>  lib/cfgfile/rte_cfgfile.h |  7 ++++
>  2 files changed, 59 insertions(+), 18 deletions(-)
> 


The existing cfgfile in DPDK is quite limited, and there are better
libraries available; not sure why a reinvention was necessary.

Re: [PATCH 0/4] cfgfile: enhance error detecting

[Stephen Hemminger]

On Thu, 4 Jul 2024 17:12:56 +0200
David Marchand <david.marchand@redhat.com> wrote:

> On Tue, Feb 20, 2024 at 5:00 AM Chengwen Feng <fengchengwen@huawei.com> wrote:
> >
> > When I was trying to debug a problem introduced by config.ini in
> > test-dma-perf, I found the cfgfile library should enhance error
> > detecting, so got this patchset.
> >
> > Chengwen Feng (4):
> >   cfgfile: remove dead code
> >   cfgfile: support verify name and value
> >   cfgfile: verify add section and entry result
> >   cfgfile: add unique name flag
> >
> >  lib/cfgfile/rte_cfgfile.c | 70 +++++++++++++++++++++++++++++----------
> >  lib/cfgfile/rte_cfgfile.h |  7 ++++
> >  2 files changed, 59 insertions(+), 18 deletions(-)  
> 
> Please review.
> 
> 


Somewhat related, why is the cfgfile test disabled?
The line for test_cfgfile is commented out in app/test/meson.build

Re: [PATCH 0/4] cfgfile: enhance error detecting

[Stephen Hemminger]

On Thu, 4 Jul 2024 17:14:33 -0700
Stephen Hemminger <stephen@networkplumber.org> wrote:

> On Thu, 4 Jul 2024 17:12:56 +0200
> David Marchand <david.marchand@redhat.com> wrote:
> 
> > On Tue, Feb 20, 2024 at 5:00 AM Chengwen Feng <fengchengwen@huawei.com> wrote:  
> > >
> > > When I was trying to debug a problem introduced by config.ini in
> > > test-dma-perf, I found the cfgfile library should enhance error
> > > detecting, so got this patchset.
> > >
> > > Chengwen Feng (4):
> > >   cfgfile: remove dead code
> > >   cfgfile: support verify name and value
> > >   cfgfile: verify add section and entry result
> > >   cfgfile: add unique name flag
> > >
> > >  lib/cfgfile/rte_cfgfile.c | 70 +++++++++++++++++++++++++++++----------
> > >  lib/cfgfile/rte_cfgfile.h |  7 ++++
> > >  2 files changed, 59 insertions(+), 18 deletions(-)    
> > 
> > Please review.
> > 
> >   
> 
> 
> Somewhat related, why is the cfgfile test disabled?
> The line for test_cfgfile is commented out in app/test/meson.build

The existing test won't build because of broken resource stuff which is
also not built. Probably best to yank the whole test and resource stuff
out until Christian fixes it.

Re: [PATCH 0/4] cfgfile: enhance error detecting

[Bruce Richardson]

On Thu, Jul 04, 2024 at 02:40:55PM -0700, Stephen Hemminger wrote:
> On Tue, 20 Feb 2024 03:58:36 +0000
> Chengwen Feng <fengchengwen@huawei.com> wrote:
> 
> > When I was trying to debug a problem introduced by config.ini in
> > test-dma-perf, I found the cfgfile library should enhance error
> > detecting, so got this patchset.
> > 
> > Chengwen Feng (4):
> >   cfgfile: remove dead code
> >   cfgfile: support verify name and value
> >   cfgfile: verify add section and entry result
> >   cfgfile: add unique name flag
> > 
> >  lib/cfgfile/rte_cfgfile.c | 70 +++++++++++++++++++++++++++++----------
> >  lib/cfgfile/rte_cfgfile.h |  7 ++++
> >  2 files changed, 59 insertions(+), 18 deletions(-)
> > 
> 
> 
> The existing cfgfile in DPDK is quite limited, and there are better
> libraries available; not sure why a reinvention was necessary.
> 
At the time, it was done to avoid having additional external dependencies.
Since then, it's generally been relatively trouble free, so it's never been
felt worth the effort to replace, I suspect.

/Bruce

[PATCH v2 0/4] cfgfile: enhance error detecting

[Chengwen Feng]

When I was trying to debug a problem introduced by config.ini in
test-dma-perf, I found the cfgfile library should enhance error
detecting, so got this patchset.

Chengwen Feng (4):
  cfgfile: remove dead code
  cfgfile: support verify name and value
  cfgfile: verify add section and entry result
  cfgfile: add strict parse flag

---
v2: replace unique name with strict parse flag which address Stephen's
    comment.

 lib/cfgfile/rte_cfgfile.c | 70 +++++++++++++++++++++++++++++----------
 lib/cfgfile/rte_cfgfile.h |  7 ++++
 2 files changed, 59 insertions(+), 18 deletions(-)

-- 
2.17.1

[PATCH v2 1/4] cfgfile: remove dead code

[Chengwen Feng]

This memchr() will never return NULL because rte_cfgfile_load() function
will skip lines without useful content.

Fixes: 74e0d3a17461 ("cfgfile: fix null pointer dereference in parsing")
Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/cfgfile/rte_cfgfile.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index 13ba3957bc..6a98e8fb11 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -223,12 +223,6 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 
 			split[0] = buffer;
 			split[1] = memchr(buffer, '=', len);
-			if (split[1] == NULL) {
-				CFG_LOG(ERR,
-					"line %d - no '=' character found",
-					lineno);
-				goto error1;
-			}
 			*split[1] = '\0';
 			split[1]++;
 
-- 
2.17.1

[PATCH v2 2/4] cfgfile: support verify name and value

[Chengwen Feng]

This patch supports verify section's name, entry's name and entry's
value validity.

Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/cfgfile/rte_cfgfile.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index 6a98e8fb11..97a399635e 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -105,6 +105,16 @@ static int
 _add_entry(struct rte_cfgfile_section *section, const char *entryname,
 		const char *entryvalue)
 {
+	int name_len, value_len;
+
+	name_len = strlen(entryname);
+	value_len = strlen(entryvalue);
+	if (name_len == 0 || name_len >= CFG_NAME_LEN || value_len >= CFG_VALUE_LEN) {
+		CFG_LOG(ERR, "invalid entry name %s or value %s in section %s",
+			entryname, entryvalue, section->name);
+		return -EINVAL;
+	}
+
 	/* resize entry structure if we don't have room for more entries */
 	if (section->num_entries == section->allocated_entries) {
 		struct rte_cfgfile_entry *n_entries = realloc(
@@ -322,6 +332,7 @@ rte_cfgfile_create(int flags)
 int
 rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 {
+	int len;
 	int i;
 
 	if (cfg == NULL)
@@ -330,6 +341,12 @@ rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 	if (sectionname == NULL)
 		return -EINVAL;
 
+	len = strlen(sectionname);
+	if (len == 0 || len >= CFG_NAME_LEN) {
+		CFG_LOG(ERR, "invalid section name %s", sectionname);
+		return -EINVAL;
+	}
+
 	/* resize overall struct if we don't have room for more	sections */
 	if (cfg->num_sections == cfg->allocated_sections) {
 
-- 
2.17.1

[PATCH v2 3/4] cfgfile: verify add section and entry result

[Chengwen Feng]

The rte_cfgfile_add_section() and _add_entry()'s result were not
verified, so that potential errors may not be detected.

This commit adds the verification.

Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/cfgfile/rte_cfgfile.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index 97a399635e..3033cff4a4 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -182,6 +182,7 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 	char buffer[CFG_NAME_LEN + CFG_VALUE_LEN + 4];
 	int lineno = 0;
 	struct rte_cfgfile *cfg;
+	int ret;
 
 	if (rte_cfgfile_check_params(params))
 		return NULL;
@@ -226,7 +227,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			*end = '\0';
 			_strip(&buffer[1], end - &buffer[1]);
 
-			rte_cfgfile_add_section(cfg, &buffer[1]);
+			ret = rte_cfgfile_add_section(cfg, &buffer[1]);
+			if (ret != 0)
+				goto error1;
 		} else {
 			/* key and value line */
 			char *split[2] = {NULL};
@@ -261,8 +264,10 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			if (cfg->num_sections == 0)
 				goto error1;
 
-			_add_entry(&cfg->sections[cfg->num_sections - 1],
-					split[0], split[1]);
+			ret = _add_entry(&cfg->sections[cfg->num_sections - 1],
+					 split[0], split[1]);
+			if (ret != 0)
+				goto error1;
 		}
 	}
 	fclose(f);
@@ -277,6 +282,7 @@ struct rte_cfgfile *
 rte_cfgfile_create(int flags)
 {
 	int i;
+	int ret;
 	struct rte_cfgfile *cfg;
 
 	/* future proof flags usage */
@@ -310,8 +316,11 @@ rte_cfgfile_create(int flags)
 		cfg->sections[i].allocated_entries = CFG_ALLOC_ENTRY_BATCH;
 	}
 
-	if (flags & CFG_FLAG_GLOBAL_SECTION)
-		rte_cfgfile_add_section(cfg, "GLOBAL");
+	if (flags & CFG_FLAG_GLOBAL_SECTION) {
+		ret = rte_cfgfile_add_section(cfg, "GLOBAL");
+		if (ret != 0)
+			goto error1;
+	}
 
 	return cfg;
 error1:
-- 
2.17.1

[PATCH v2 4/4] cfgfile: add strict parse flag

[Chengwen Feng]

The cfgfile supports duplicate section name and entry name when parsing
config file, which may confused and hard to debug when accidentally set
duplicate name.

So add strict parse flag, it will treat as error if encounter duplicate
section name or entry name.

Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/cfgfile/rte_cfgfile.c | 32 +++++++++++++++++++++++---------
 lib/cfgfile/rte_cfgfile.h |  7 +++++++
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index 3033cff4a4..5d96818728 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -102,8 +102,8 @@ _get_section(struct rte_cfgfile *cfg, const char *sectionname)
 }
 
 static int
-_add_entry(struct rte_cfgfile_section *section, const char *entryname,
-		const char *entryvalue)
+_add_entry(struct rte_cfgfile *cfg, struct rte_cfgfile_section *section,
+	   const char *entryname, const char *entryvalue, bool check_dup)
 {
 	int name_len, value_len;
 
@@ -115,6 +115,14 @@ _add_entry(struct rte_cfgfile_section *section, const char *entryname,
 		return -EINVAL;
 	}
 
+	if (check_dup) {
+		if (rte_cfgfile_has_entry(cfg, section->name, entryname) != 0) {
+			CFG_LOG(ERR, "duplicate entry name %s in section %s",
+				entryname, section->name);
+			return -EEXIST;
+		}
+	}
+
 	/* resize entry structure if we don't have room for more entries */
 	if (section->num_entries == section->allocated_entries) {
 		struct rte_cfgfile_entry *n_entries = realloc(
@@ -264,8 +272,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			if (cfg->num_sections == 0)
 				goto error1;
 
-			ret = _add_entry(&cfg->sections[cfg->num_sections - 1],
-					 split[0], split[1]);
+			ret = _add_entry(cfg, &cfg->sections[cfg->num_sections - 1],
+					 split[0], split[1],
+					 !!(flags & CFG_FLAG_STRICT_PARSE));
 			if (ret != 0)
 				goto error1;
 		}
@@ -286,7 +295,8 @@ rte_cfgfile_create(int flags)
 	struct rte_cfgfile *cfg;
 
 	/* future proof flags usage */
-	if (flags & ~(CFG_FLAG_GLOBAL_SECTION | CFG_FLAG_EMPTY_VALUES))
+	if (flags & ~(CFG_FLAG_GLOBAL_SECTION | CFG_FLAG_EMPTY_VALUES |
+		      CFG_FLAG_STRICT_PARSE))
 		return NULL;
 
 	cfg = malloc(sizeof(*cfg));
@@ -356,6 +366,13 @@ rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 		return -EINVAL;
 	}
 
+	if (cfg->flags & CFG_FLAG_STRICT_PARSE) {
+		if (rte_cfgfile_has_section(cfg, sectionname) != 0) {
+			CFG_LOG(ERR, "duplicate section name %s", sectionname);
+			return -EEXIST;
+		}
+	}
+
 	/* resize overall struct if we don't have room for more	sections */
 	if (cfg->num_sections == cfg->allocated_sections) {
 
@@ -396,16 +413,13 @@ int rte_cfgfile_add_entry(struct rte_cfgfile *cfg,
 			|| (entryvalue == NULL))
 		return -EINVAL;
 
-	if (rte_cfgfile_has_entry(cfg, sectionname, entryname) != 0)
-		return -EEXIST;
-
 	/* search for section pointer by sectionname */
 	struct rte_cfgfile_section *curr_section = _get_section(cfg,
 								sectionname);
 	if (curr_section == NULL)
 		return -EINVAL;
 
-	ret = _add_entry(curr_section, entryname, entryvalue);
+	ret = _add_entry(cfg, curr_section, entryname, entryvalue, true);
 
 	return ret;
 }
diff --git a/lib/cfgfile/rte_cfgfile.h b/lib/cfgfile/rte_cfgfile.h
index 232c65c77b..b3c50cdfb2 100644
--- a/lib/cfgfile/rte_cfgfile.h
+++ b/lib/cfgfile/rte_cfgfile.h
@@ -56,6 +56,13 @@ enum {
 	 * be zero length (e.g., "key=").
 	 */
 	CFG_FLAG_EMPTY_VALUES = 2,
+
+	/**
+	 * Indicates that the parser will not allow for any section and entry
+	 * duplicates. If a duplicated section or entry is detected, the
+	 * operation will return error.
+	 */
+	CFG_FLAG_STRICT_PARSE = 4,
 };
 /**@} */
 
-- 
2.17.1

Re: [PATCH 4/4] cfgfile: add unique name flag

[fengchengwen]

Hi Stephen,

On 2024/7/5 5:36, Stephen Hemminger wrote:
> On Tue, 20 Feb 2024 03:58:40 +0000
> Chengwen Feng <fengchengwen@huawei.com> wrote:
> 
>> The cfgfile supports duplicate section name and entry name when parsing
>> config file, which may confused and hard to debug when accidentally set
>> duplicate name.
>>
>> So add unique name flag, it will treat as error if encounter duplicate
>> section name or entry name.
>>
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> 
> https://en.wikipedia.org/wiki/INI_file
> 
> 	Interpretation of multiple section declarations with the same name also varies. 
> 	In some implementations, duplicate sections simply merge their properties, as if
> 	they occurred contiguously. Others may abort, or ignore some aspect of the INI file.
> 
> The standard reference for INI file parsing on Linux is the Python configparser
> https://docs.python.org/3/library/configparser.html
> 
> 	strict, default value: True
> 
> 	When set to True, the parser will not allow for any section or option duplicates while reading from a single source 	(using read_file(), read_string() or read_dict()). It is recommended to use strict parsers in new applications.
> 
> The problem I see is that cfgfile allows duplicates on names, and sections.
> Perhaps there should be a new strict flag for this.

It is important to keep the naming consistent, already sent v2 to fix it.

Thanks

> .
>