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* src: expose nft_ctx_clear_vars as APIPablo Neira Ayuso2021-07-241-1/+3
| | | | | | | | | This function might be useful to recycle the existing nft_ctx to use it with different external variable definitions. Moreover, reset ctx->num_vars to zero. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add --define key=valuePablo Neira Ayuso2021-07-201-0/+95
| | | | | | | | | | | | | | | | | This patch adds a new option to define variables from the command line. # cat test.nft table netdev x { chain y { type filter hook ingress devices = $dev priority 0; counter accept } } # nft --define dev="{ eth0, eth1 }" -f test.nft You can only combine it with -f/--filename. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: fix memleak when first message in batch is used to report errorPablo Neira Ayuso2021-06-231-0/+6
| | | | | | | | | The err->seqnum == batch_seqnum case results in a memleak of mnl_err objects under some scenarios such as nf_tables kernel support is not available or user runs the nft executable as non-root. Fixes: f930cc500318 ("nftables: fix supression of "permission denied" errors") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* cache: add hashtable cache for tablePablo Neira Ayuso2021-05-021-1/+2
| | | | | | | | | | | | Add a hashtable for fast table lookups. Tables that reside in the cache use the table->cache_hlist and table->cache_list heads. Table that are created from command line / ruleset are also added to the cache. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: consolidate nft_cache infrastructurePablo Neira Ayuso2021-05-021-5/+5
| | | | | | | | - prepend nft_ prefix to nft_cache API and internal functions - move declarations to cache.h (and remove redundant declarations) - move struct nft_cache definition to cache.h Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: report EPERM for non-root usersPablo Neira Ayuso2020-12-041-1/+6
| | | | | | | | | $ /usr/sbin/nft list ruleset Operation not permitted (you must be root) Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1372 Acked-by: Arturo Borrero Gonzalez <arturo@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: avoid repeated command list traversal on errorsJindrich Makovicka2020-09-141-2/+14
| | | | | | | | | Because the command seqnums are monotonic, repeated traversals of the cmds list from the beginning are not necessary as long as the error seqnums are also monotonic. Signed-off-by: Jindrich Makovicka <makovick@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add expression handler hashtablePablo Neira Ayuso2020-08-261-0/+2
| | | | | | | netlink_parsers is actually small, but update this code to use a hashtable instead since more expressions may come in the future. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: call nft_cmd_expand() only with CMD_ADDPablo Neira Ayuso2020-05-141-1/+5
| | | | | | | Restrict the expansion logic to the CMD_ADD command which is where this is only required. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: combine extended netlink error reporting with mispelling supportPablo Neira Ayuso2020-02-191-21/+2
| | | | | | | | | | | Preliminary support: only for the deletion command, e.g. # nft delete table twst Error: No such file or directory; did you mean table ‘test’ in family ip? delete table twst ^^^^ Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: initial extended netlink error reportingPablo Neira Ayuso2020-02-191-3/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch correlates the in-kernel extended netlink error offset and the location information. Assuming 'foo' table does not exist, then error reporting shows: # nft delete table foo Error: Could not process rule: No such file or directory delete table foo ^^^ Similarly, if table uniquely identified by handle '1234' does not exist, then error reporting shows: # nft delete table handle 1234 Error: Could not process rule: No such file or directory delete table handle 1234 ^^^^ Assuming 'bar' chain does not exists in the kernel, while 'foo' does: # nft delete chain foo bar Error: Could not process rule: No such file or directory delete chain foo bar ^^^ This also gives us a hint when adding rules: # nft add rule ip foo bar counter Error: Could not process rule: No such file or directory add rule ip foo bar counter ^^^ This is based on ("src: basic support for extended netlink errors") from Florian Westphal, posted in 2018, with no netlink offset correlation support. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Store top_scope in struct nft_ctxPhil Sutter2019-11-071-2/+4
| | | | | | | | | | | | | | | | Allow for interactive sessions to make use of defines. Since parser is initialized for each line, top scope defines didn't persist although they are actually useful for stuff like: | # nft -i | define goodports = { 22, 23, 80, 443 } | add rule inet t c tcp dport $goodports accept | add rule inet t c tcp sport $goodports accept While being at it, introduce scope_alloc() and scope_free(). Signed-off-by: Phil Sutter <phil@nwl.cc> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: memleak when list of commands is emptyPablo Neira Ayuso2019-09-271-1/+1
| | | | | | | | | | | | | ==9946== 200,807 (40 direct, 200,767 indirect) bytes in 1 blocks are definitely lost in loss record 4 of 4 ==9946== at 0x4837B65: calloc (vg_replace_malloc.c:762) ==9946== by 0x4F28216: nftnl_batch_alloc (batch.c:66) ==9946== by 0x48A33E8: mnl_batch_init (mnl.c:164) ==9946== by 0x48A736F: nft_netlink.isra.0 (libnftables.c:29) ==9946== by 0x48A7D03: nft_run_cmd_from_filename (libnftables.c:508) ==9946== by 0x10A621: main (main.c:328) Fixes: fc6d0f8b0cb1 ("libnftables: get rid of repeated initialization of netlink_ctx") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: use-after-free in exit pathPablo Neira Ayuso2019-09-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | ==29699== Invalid read of size 8 ==29699== at 0x507E140: ct_label_table_exit (ct.c:239) ==29699== by 0x5091877: nft_exit (libnftables.c:97) ==29699== by 0x5091877: nft_ctx_free (libnftables.c:297) [...] ==29699== Address 0xb251008 is 136 bytes inside a block of size 352 free'd ==29699== at 0x4C2CDDB: free (vg_replace_malloc.c:530) ==29699== by 0x509186F: nft_ctx_free (libnftables.c:296) [...] ==29699== Block was alloc'd at ==29699== at 0x4C2DBC5: calloc (vg_replace_malloc.c:711) ==29699== by 0x508C51D: xmalloc (utils.c:36) ==29699== by 0x508C51D: xzalloc (utils.c:65) ==29699== by 0x50916BE: nft_ctx_new (libnftables.c:151) [...] Release symbol tables before context object. Fixes: 45cb29a2ada4 ("src: remove global symbol_table") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: libnftnl: run single-initcalls only onceFlorian Westphal2019-08-191-5/+9
| | | | Signed-off-by: Florian Westphal <fw@strlen.de>
* src: remove global symbol_tablePablo Neira Ayuso2019-08-081-15/+14
| | | | | | | | | Store symbol tables in context object instead. Use the nft_ctx object to store the dynamic symbol table. Pass it on to the parse_ctx object so this can be accessed from the parse routines. This dynamic symbol table is also accesible from the output_ctx object for print routines. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: get rid of repeated initialization of netlink_ctxJeremy Sowden2019-07-221-13/+10
| | | | | | | | | | | | Most members in the context don't change, so there is no need to memset it and reassign them on every iteration. Moved that code out of the loop. Fixes: a72315d2bad4 ("src: add rule batching support") Reported-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Jeremy Sowden <jeremy@azazel.net> Acked-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: export public symbols onlyArturo Borrero Gonzalez2019-07-011-0/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Export public symbols (the library API functions) instead of all symbols in the library. This patch introduces the required macros to manage the visibility attributes (mostly copied from libnftnl.git) and also marks each symbol as exported when they need to be public. Also, introduce a .map file for proper symbol versioning. Previous to this patch, libnftables public symbols were: % dpkg-gensymbols -q -plibnftables -v0.9.1 -O -esrc/.libs/libnftables.so.1 | wc -l 527 With this patch, libnftables symbols are: % dpkg-gensymbols -q -plibnftables -v0.9.1 -O -esrc/.libs/libnftables.so.1 libnftables.so.1 libnftables #MINVER# nft_ctx_add_include_path@Base 0.9.1 nft_ctx_buffer_error@Base 0.9.1 nft_ctx_buffer_output@Base 0.9.1 nft_ctx_clear_include_paths@Base 0.9.1 nft_ctx_free@Base 0.9.1 nft_ctx_get_dry_run@Base 0.9.1 nft_ctx_get_error_buffer@Base 0.9.1 nft_ctx_get_output_buffer@Base 0.9.1 nft_ctx_new@Base 0.9.1 nft_ctx_output_get_debug@Base 0.9.1 nft_ctx_output_get_flags@Base 0.9.1 nft_ctx_output_set_debug@Base 0.9.1 nft_ctx_output_set_flags@Base 0.9.1 nft_ctx_set_dry_run@Base 0.9.1 nft_ctx_set_error@Base 0.9.1 nft_ctx_set_output@Base 0.9.1 nft_ctx_unbuffer_error@Base 0.9.1 nft_ctx_unbuffer_output@Base 0.9.1 nft_run_cmd_from_buffer@Base 0.9.1 nft_run_cmd_from_filename@Base 0.9.1 Signed-off-by: Arturo Borrero Gonzalez <arturo@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: reallocate definition of nft_print() and nft_gmp_print()Arturo Borrero Gonzalez2019-07-011-27/+0
| | | | | | | | | | | | They are not part of the libnftables library API, they are not public symbols, so it doesn't not make sense to have them there. Move the two functions to a different source file so libnftables.c only has the API functions. I think copyright belongs to Phil Sutter since he introduced this code back in commit 2535ba7006f22a6470f4c88ea7d30c343a1d8799 (src: get rid of printf). Signed-off-by: Arturo Borrero Gonzalez <arturo@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add cache level flagsPablo Neira Ayuso2019-06-171-3/+3
| | | | | | | | | | | | | The score approach based on command type is confusing. This patch introduces cache level flags, each flag specifies what kind of object type is needed. These flags are set on/off depending on the list of commands coming in this batch. cache_is_complete() now checks if the cache contains the objects that are needed through these new flags. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: check for errors after evaluationsPablo Neira Ayuso2019-06-071-0/+3
| | | | | | | | Check for state->nerrs after evaluation to restore error reporting when evaluation fails. Fixes: df2f746fb4cf ("libnftables: keep evaluating until parser_max_errors") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: keep evaluating until parser_max_errorsPablo Neira Ayuso2019-06-071-1/+2
| | | | | | | | | | | | | | | | | | Bail out after parser_max_errors has been reached, eg. # nft -f /tmp/errors.nft /tmp/errors.nft:1:23-23: Error: syntax error, unexpected newline filter input tcp dport ^ /tmp/errors.nft:2:24-26: Error: datatype mismatch, expected internet network service, expression has type Internet protocol filter input tcp dport tcp ~~~~~~~~~ ^^^ /tmp/errors.nft:3:24-26: Error: datatype mismatch, expected internet network service, expression has type Internet protocol filter input tcp sport udp ~~~~~~~~~ ^^^ Fixes: f211921e25e6 ("src: perform evaluation after parsing") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Drop cache in error casePhil Sutter2019-06-061-0/+4
| | | | | | | | | | | | | | | | | | | | | | | If a transaction is rejected by the kernel (for instance due to a semantic error), cache contents are potentially invalid. Release the cache in that case to avoid the inconsistency. The problem is easy to reproduce in an interactive session: | nft> list ruleset | table ip t { | chain c { | } | } | nft> flush ruleset; add rule ip t c accept | Error: No such file or directory | flush ruleset; add rule ip t c accept | ^ | nft> list ruleset | nft> Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: single cache_update() call to build cache before evaluationPablo Neira Ayuso2019-06-061-4/+5
| | | | | | | | | | | | | | | This patch allows us to make one single cache_update() call. Thus, there is not need to rebuild an incomplete cache from the middle of the batch processing. Note that nft_run_cmd_from_filename() does not need a full netlink dump to build the cache anymore, this should speed nft -f with incremental updates and very large rulesets. cache_evaluate() calculates the netlink dump to populate the cache that this batch needs. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Display parser and evaluate errors in one shotPablo Neira Ayuso2019-06-051-6/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch restores 61236968b7a1 ("parser: evaluate commands immediately after parsing") following a different approach. In this patch, the evaluation phase is done if the parsing phase fails, hence the user gets parsing and evaluation errors in one shot, which is the purpose of 61236968b7a1. Note that evaluation errors are now shown after parser errors, the example available in 61236968b7a1 displays with this patch the following error: # nft -f /tmp/bad.nft /tmp/bad.nft:3:32-32: Error: syntax error, unexpected newline add rule filter input tcp dport ^ /tmp/bad.nft:5:37-41: Error: syntax error, unexpected dport, expecting end of file or newline or semicolon add rule filter input tcp dport tcp dport ^^^^^ /tmp/bad.nft:4:33-35: Error: datatype mismatch, expected internet network service, expression has type Internet protocol add rule filter input tcp dport tcp ~~~~~~~~~ ^^^ So evaluation pointing to line 4 happens after line error reporting generated by the parser that points to line 3, while 61236968b7a1 was showing errors per line in order. As a future work, we can sort the error reporting list to restore exactly the same behaviour. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: perform evaluation after parsingPablo Neira Ayuso2019-06-051-5/+25
| | | | | | | | | | | | | | | | | Since 61236968b7a1 ("parser: evaluate commands immediately after parsing"), evaluation is invoked from the parsing phase in order to improve error reporting. However, this approach is problematic from the cache perspective since we don't know if a full or partial netlink dump from the kernel is needed. If the number of objects in the kernel is significant, the netlink dump operation to build the cache may significantly slow down commands. This patch moves the evaluation phase after the parsing phase as a preparation update to allow for a better strategy to build the cache. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: mnl_batch_talk() returns -1 on internal netlink errorsPablo Neira Ayuso2019-05-311-0/+8
| | | | | | Display an error in case internal netlink plumbing hits problems. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: estimate receiver buffer sizePablo Neira Ayuso2019-05-311-2/+3
| | | | | | | | | | | | | | | | | Set a receiver buffer size based on the number of commands and the average message size, this is useful for the --echo option in order to avoid ENOBUFS errors. On the kernel side, each skbuff consumes truesize from the socket queue (although it uses NLMSG_GOODSIZE to allocate it), which is approximately four times the estimated size per message that we get in turn for each echo message to ensure enough receiver buffer space. We could also explore increasing the buffer and retry if mnl_nft_socket_sendmsg() hits ENOBUFS if we ever hit this problem again. Reported-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: file descriptor leak in include_file()Pablo Neira Ayuso2019-03-151-3/+3
| | | | | | | | File that contains the ruleset is never closed, track open files through the nft_ctx object and close them accordingly. Reported-by: Václav Zindulka <vaclav.zindulka@tlapnet.cz> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Print errors before freeing commandsPhil Sutter2019-02-271-2/+2
| | | | | | | | | Commands may contain data printed by an error record, so make sure cmd_free() is not called before erec_print_list() has returned. Fixes: 778de37d82e7b ("libnftables: Keep cmds list outside of parser_state") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: get rid of nft_ctx_output_{get,set}_numeric()Pablo Neira Ayuso2018-10-301-11/+0
| | | | | | | | | | | | | | | | | | | | | | | This patch adds NFT_CTX_OUTPUT_NUMERIC_SYMBOL, which replaces the last client of the numeric level approach. This patch updates `-n' option semantics to display all output numerically. Note that monitor code was still using the -n option to skip printing the process name, this patch updates that path too to print it inconditionally to simplify things. Given the numeric levels have no more clients after this patch, remove that code. Update several tests/shell not to use -nn. This patch adds NFT_CTX_OUTPUT_NUMERIC_ALL which enables all flags to provide a fully numerical output. Acked-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add nft_ctx_output_{get,set}_echo() to nft_ctx_output_{get,set}_flagsPablo Neira Ayuso2018-10-291-12/+6
| | | | | | | | Add NFT_CTX_OUTPUT_ECHO flag and echo the command that has been send to the kernel. Acked-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add nft_ctx_output_{get,set}_json() to nft_ctx_output_{get,set}_flagsPablo Neira Ayuso2018-10-291-20/+4
| | | | | | | Add NFT_CTX_OUTPUT_JSON flag and display output in json format. Acked-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add nft_ctx_output_{get,set}_handle() to nft_ctx_output_{get,set}_flagsPablo Neira Ayuso2018-10-291-10/+0
| | | | | | | | Add NFT_CTX_OUTPUT_HANDLE flag and print handle that uniquely identify objects from new output flags interface. Acked-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add nft_ctx_output_{get,set}_stateless() to ↵Pablo Neira Ayuso2018-10-291-10/+0
| | | | | | | | | | | | nft_ctx_output_{get,flags}_flags Add NFT_CTX_OUTPUT_STATELESS flag and enable stateless printing from new output flags interface. This patch adds nft_output_save_flags() and nft_output_restore_flags() to temporarily disable stateful printing Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Revert --literal, add -S/--servicePablo Neira Ayuso2018-10-291-4/+4
| | | | | | | | | | | | | | | | | | | | | | This is a partial revert of b0f6a45b25dd1 ("src: add --literal option") which was added during the development cycle before 0.9.1 is released. After looking at patch: https://patchwork.ozlabs.org/patch/969864/ that allows to print priority, uid, gid and protocols as numerics, I decided to revisit this to provide individual options to turn on literal printing. What I'm proposing is to provide a good default for everyone, and provide options to turn on literal/numeric printing. This patch adds nft_ctx_output_{set,get}_flags() and define two flags to enable reverse DNS lookups and to print ports as service names. This patch introduces -S/--services, to print service names as per /etc/services. Acked-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* JSON: Add support for echo optionPhil Sutter2018-10-291-0/+4
| | | | | | | | | | | | | | | | The basic principle is to not return a JSON object freshly created from netlink responses, but just update the existing user-provided one to make sure callers get back exactly what they expect. To achieve that, keep the parsed JSON object around in a global variable ('cur_root') and provide a custom callback to insert handles into it from received netlink messages. The tricky bit here is updating rules since unique identification is problematic. Therefore drop possibly present handles from input and later assume updates are received in order so the first rule not having a handle set is the right one. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netlink: remove netlink_batch_send()Pablo Neira Ayuso2018-10-241-1/+1
| | | | | | Replace it by direct call to mnl_batch_talk(). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: move socket open and reopen to mnl.cPablo Neira Ayuso2018-10-231-2/+2
| | | | | | | These functions are part of the mnl backend, move them there. Remove netlink_close_sock(), use direct call to mnl_socket_close(). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: pass struct nft_ctx through struct netlink_ctxPablo Neira Ayuso2018-10-221-6/+2
| | | | Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Fix memleak in nft_parse_bison_filename()Phil Sutter2018-10-151-4/+3
| | | | | | | | | Allocated scanner object leaks when returning to caller. For some odd reason, this was missed by the commit referenced below. Fixes: bd82e03e15df8 ("libnftables: Move scanner object into struct nft_ctx") Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add --literal optionPablo Neira Ayuso2018-07-071-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Default not to print the service name as we discussed during the NFWS. # nft list ruleset table ip x { chain y { tcp dport 22 ip saddr 1.1.1.1 } } # nft -l list ruleset table ip x { chain y { tcp dport ssh ip saddr 1.1.1.1 } } # nft -ll list ruleset table ip x { chain y { tcp dport 22 ip saddr 1dot1dot1dot1.cloudflare-dns.com } } Then, -ll displays FQDN. just like the (now deprecated) --ip2name (-N) option. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Simplify nft_run_cmd_from_buffer footprintPhil Sutter2018-06-181-8/+6
| | | | | | | | | | | | | | | | | | | | | | | With libnftables documentation being upstream and one confirmed external user (nftlb), time to break the API! First of all, the command buffer passed to nft_run_cmd_from_buffer may (and should) be const. One should consider it a bug if that function ever changed it's content. On the other hand, there is no point in passing the buffer's length as separate argument: NULL bytes are not expected to occur in the input, so it is safe to rely upon strlen(). Also, the actual parsers don't require a buffer length passed to them, either. The only use-case for it is when reallocating the buffer to append a final newline character, there strlen() is perfectly sufficient. Suggested-by: Harald Welte <laforge@gnumonks.org> Cc: Laura Garcia Liebana <nevola@gmail.com> Cc: Eric Leblond <eric@regit.org> Cc: Arturo Borrero Gonzalez <arturo@netfilter.org> Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Fix exit_cookie()Phil Sutter2018-06-181-0/+2
| | | | | | | | | | | | | | | | | | The output and error buffer feature depends on cookie->orig_fp to indicate the current status of buffering: If it is set, a prior call to init_cookie() is assumed. Though exit_cookie() missed to reset that pointer to NULL. causing weird behaviour in applications if they do: | nft = nft_ctx_new(0); | nft_ctx_buffer_output(nft); | nft_ctx_unbuffer_output(nft); | nft_ctx_buffer_output(nft); While being at it, apply the same fix to error path in init_cookie() as well. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Move scanner object into struct nft_ctxPhil Sutter2018-05-151-22/+21
| | | | | | | | | | | | | | The initial approach of keeping as much of lex/yacc-specific data local to the relevant parsing routines was flawed in that input descriptors which parsed commands' location information points at were freed after parsing (in scanner_destroy()) although they were required later for error reporting in case a command was rejected by the kernel. To overcome this, keep the scanner pointer in struct nft_ctx so that it can be kept in place until kernel communication has finished. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Implement JSON parserPhil Sutter2018-05-111-3/+10
| | | | | | | | | If JSON output setting is active in current context, try parsing any input as JSON. If the initial loading of the buffer or filename by libjansson fails, fall back to regular syntax parser. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Implement JSON output supportPhil Sutter2018-05-111-0/+16
| | | | | | | | | | | | Although technically there already is support for JSON output via 'nft export json' command, it is hardly useable since it exports all the gory details of nftables VM. Also, libnftables has no control over what is exported since the content comes directly from libnftnl. Instead, implement JSON format support for regular 'nft list' commands. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Put bison parsing into dedicated functionsPhil Sutter2018-05-111-39/+62
| | | | | | | | Preparing for an alternative JSON parser, put bison specific details into separate functions. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: fix header exportArturo Borrero Gonzalez2018-05-021-1/+1
| | | | | | | | | | | Instruct Make to actually install the header to the system, otherwise users won't see the header in their system after running 'make install'. Also, export main libnftables header with a proper name, since we have another private header called 'nftables.h' (i.e, let's be concrete with the naming). Signed-off-by: Arturo Borrero Gonzalez <arturo@netfilter.org> Signed-off-by: Florian Westphal <fw@strlen.de>
* src: centralize netlink error reportingPablo Neira Ayuso2018-04-241-1/+5
| | | | | | Consolidate error reporting from do_command() call. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
generated by cgit v1.2.3 (git 2.25.0) at 2024-11-11 19:53:35 +0000