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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
commit | 2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 (patch) | |
tree | c05dc0f8e6aa3accc84e3e5cffc933ed94941383 /lib/ptm_lib.c | |
parent | Initial commit. (diff) | |
download | frr-upstream.tar.xz frr-upstream.zip |
Adding upstream version 8.4.4.upstream/8.4.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lib/ptm_lib.c | 487 |
1 files changed, 487 insertions, 0 deletions
diff --git a/lib/ptm_lib.c b/lib/ptm_lib.c new file mode 100644 index 0000000..e00dd54 --- /dev/null +++ b/lib/ptm_lib.c @@ -0,0 +1,487 @@ +/* PTM Library + * Copyright (C) 2015 Cumulus Networks, Inc. + * + * This file is part of Quagga. + * + * Quagga is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2, or (at your option) any + * later version. + * + * Quagga is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <stdbool.h> +#include <stddef.h> +#include <string.h> +#include <ctype.h> +#include <unistd.h> +#include <errno.h> +#include <sys/socket.h> +#include "csv.h" +#include "ptm_lib.h" + +#define DEBUG_E 0 +#define DEBUG_V 0 + +#define ERRLOG(fmt, ...) \ + do { \ + if (DEBUG_E) \ + fprintf(stderr, "%s:%d:%s(): " fmt, __FILE__, \ + __LINE__, __func__, ##__VA_ARGS__); \ + } while (0) + +#define DLOG(fmt, ...) \ + do { \ + if (DEBUG_V) \ + fprintf(stderr, "%s:%d:%s(): " fmt, __FILE__, \ + __LINE__, __func__, ##__VA_ARGS__); \ + } while (0) + +typedef struct ptm_lib_msg_ctxt_s { + int cmd_id; + csv_t *csv; + ptmlib_msg_type type; +} ptm_lib_msg_ctxt_t; + +static csv_record_t *_ptm_lib_encode_header(csv_t *csv, csv_record_t *rec, + int msglen, int version, int type, + int cmd_id, char *client_name) +{ + char msglen_buf[16], vers_buf[16], type_buf[16], cmdid_buf[16]; + char client_buf[32]; + csv_record_t *rec1; + + snprintf(msglen_buf, sizeof(msglen_buf), "%4d", msglen); + snprintf(vers_buf, sizeof(vers_buf), "%4d", version); + snprintf(type_buf, sizeof(type_buf), "%4d", type); + snprintf(cmdid_buf, sizeof(cmdid_buf), "%4d", cmd_id); + snprintf(client_buf, 17, "%16.16s", client_name); + if (rec) { + rec1 = csv_encode_record(csv, rec, 5, msglen_buf, vers_buf, + type_buf, cmdid_buf, client_buf); + } else { + rec1 = csv_encode(csv, 5, msglen_buf, vers_buf, type_buf, + cmdid_buf, client_buf); + } + return (rec1); +} + +static int _ptm_lib_decode_header(csv_t *csv, int *msglen, int *version, + int *type, int *cmd_id, char *client_name) +{ + char *hdr; + csv_record_t *rec; + csv_field_t *fld; + int i, j; + + csv_decode(csv, NULL); + rec = csv_record_iter(csv); + if (rec == NULL) { + DLOG("malformed CSV\n"); + return -1; + } + hdr = csv_field_iter(rec, &fld); + if (hdr == NULL) { + DLOG("malformed CSV\n"); + return -1; + } + *msglen = atoi(hdr); + hdr = csv_field_iter_next(&fld); + if (hdr == NULL) { + DLOG("malformed CSV\n"); + return -1; + } + *version = atoi(hdr); + hdr = csv_field_iter_next(&fld); + if (hdr == NULL) { + DLOG("malformed CSV\n"); + return -1; + } + *type = atoi(hdr); + hdr = csv_field_iter_next(&fld); + if (hdr == NULL) { + DLOG("malformed CSV\n"); + return -1; + } + *cmd_id = atoi(hdr); + hdr = csv_field_iter_next(&fld); + if (hdr == NULL) { + DLOG("malformed CSV\n"); + return -1; + } + /* remove leading spaces */ + for (i = j = 0; i < csv_field_len(fld); i++) { + if (!isspace((unsigned char)hdr[i])) { + client_name[j] = hdr[i]; + j++; + } + } + client_name[j] = '\0'; + + return 0; +} + +int ptm_lib_append_msg(ptm_lib_handle_t *hdl, void *ctxt, const char *key, + const char *val) +{ + ptm_lib_msg_ctxt_t *p_ctxt = ctxt; + csv_t *csv; + csv_record_t *mh_rec, *rec; + + if (!p_ctxt) { + ERRLOG("%s: no context \n", __func__); + return -1; + } + + csv = p_ctxt->csv; + mh_rec = csv_record_iter(csv); + rec = csv_record_iter_next(mh_rec); + + /* append to the hdr record */ + rec = csv_append_record(csv, rec, 1, key); + if (!rec) { + ERRLOG("%s: Could not append key \n", __func__); + return -1; + } + + rec = csv_record_iter_next(rec); + /* append to the data record */ + rec = csv_append_record(csv, rec, 1, val); + if (!rec) { + ERRLOG("%s: Could not append val \n", __func__); + return -1; + } + + /* update the msg hdr */ + _ptm_lib_encode_header(csv, mh_rec, (csvlen(csv) - PTMLIB_MSG_HDR_LEN), + PTMLIB_MSG_VERSION, p_ctxt->type, p_ctxt->cmd_id, + hdl->client_name); + + return 0; +} + +int ptm_lib_init_msg(ptm_lib_handle_t *hdl, int cmd_id, int type, void *in_ctxt, + void **out_ctxt) +{ + ptm_lib_msg_ctxt_t *p_ctxt; + ptm_lib_msg_ctxt_t *p_in_ctxt = in_ctxt; + csv_t *csv; + csv_record_t *rec, *d_rec; + + /* Initialize csv for using discrete record buffers */ + csv = csv_init(NULL, NULL, PTMLIB_MSG_SZ); + + if (!csv) { + ERRLOG("%s: Could not allocate csv \n", __func__); + return -1; + } + + rec = _ptm_lib_encode_header(csv, NULL, 0, PTMLIB_MSG_VERSION, type, + cmd_id, hdl->client_name); + + if (!rec) { + ERRLOG("%s: Could not allocate record \n", __func__); + csv_clean(csv); + csv_free(csv); + return -1; + } + + p_ctxt = calloc(1, sizeof(*p_ctxt)); + if (!p_ctxt) { + ERRLOG("%s: Could not allocate context \n", __func__); + csv_clean(csv); + csv_free(csv); + return -1; + } + + p_ctxt->csv = csv; + p_ctxt->cmd_id = cmd_id; + p_ctxt->type = type; + + *(ptm_lib_msg_ctxt_t **)out_ctxt = p_ctxt; + + /* caller supplied a context to initialize with? */ + if (p_in_ctxt) { + /* insert the hdr rec */ + rec = csv_record_iter(p_in_ctxt->csv); + csv_clone_record(p_in_ctxt->csv, rec, &d_rec); + csv_insert_record(csv, d_rec); + /* insert the data rec */ + rec = csv_record_iter_next(rec); + csv_clone_record(p_in_ctxt->csv, rec, &d_rec); + csv_insert_record(csv, d_rec); + } + return 0; +} + +int ptm_lib_cleanup_msg(ptm_lib_handle_t *hdl, void *ctxt) +{ + ptm_lib_msg_ctxt_t *p_ctxt = ctxt; + csv_t *csv; + + if (!p_ctxt) { + ERRLOG("%s: no context \n", __func__); + return -1; + } + + csv = p_ctxt->csv; + + csv_clean(csv); + csv_free(csv); + free(p_ctxt); + + return 0; +} + +int ptm_lib_complete_msg(ptm_lib_handle_t *hdl, void *ctxt, char *buf, int *len) +{ + ptm_lib_msg_ctxt_t *p_ctxt = ctxt; + csv_t *csv; + csv_record_t *rec; + + if (!p_ctxt) { + ERRLOG("%s: no context \n", __func__); + return -1; + } + + csv = p_ctxt->csv; + rec = csv_record_iter(csv); + + _ptm_lib_encode_header(csv, rec, (csvlen(csv) - PTMLIB_MSG_HDR_LEN), + PTMLIB_MSG_VERSION, p_ctxt->type, p_ctxt->cmd_id, + hdl->client_name); + + /* parse csv contents into string */ + if (buf && len) { + if (csv_serialize(csv, buf, *len)) { + ERRLOG("%s: cannot serialize\n", __func__); + return -1; + } + *len = csvlen(csv); + } + + csv_clean(csv); + csv_free(csv); + free(p_ctxt); + + return 0; +} + +int ptm_lib_find_key_in_msg(void *ctxt, const char *key, char *val) +{ + ptm_lib_msg_ctxt_t *p_ctxt = ctxt; + csv_t *csv = p_ctxt->csv; + csv_record_t *hrec, *drec; + csv_field_t *hfld, *dfld; + char *hstr, *dstr; + + /** + * skip over ptm hdr if present + * The next hdr is the keys (column name) + * The next hdr is the data + */ + if (csv_num_records(csv) > 2) { + hrec = csv_record_iter(csv); + hrec = csv_record_iter_next(hrec); + } else { + hrec = csv_record_iter(csv); + } + drec = csv_record_iter_next(hrec); + val[0] = '\0'; + for (hstr = csv_field_iter(hrec, &hfld), + dstr = csv_field_iter(drec, &dfld); + (hstr && dstr); hstr = csv_field_iter_next(&hfld), + dstr = csv_field_iter_next(&dfld)) { + if (!strncmp(hstr, key, csv_field_len(hfld))) { + snprintf(val, csv_field_len(dfld) + 1, "%s", dstr); + return 0; + } + } + + return -1; +} + +static int _ptm_lib_read_ptm_socket(int fd, char *buf, int len) +{ + int retries = 0, rc; + int bytes_read = 0; + + while (bytes_read != len) { + rc = recv(fd, (void *)(buf + bytes_read), (len - bytes_read), + MSG_DONTWAIT); + if (rc <= 0) { + if (errno && (errno != EAGAIN) + && (errno != EWOULDBLOCK)) { + ERRLOG("fatal recv error(%s), closing connection, rc %d\n", + strerror(errno), rc); + return (rc); + } else { + if (retries++ < 2) { + usleep(10000); + continue; + } + DLOG("max retries - recv error(%d - %s) bytes read %d (%d)\n", + errno, strerror(errno), bytes_read, len); + return (bytes_read); + } + break; + } else { + bytes_read += rc; + } + } + + return bytes_read; +} + +int ptm_lib_process_msg(ptm_lib_handle_t *hdl, int fd, char *inbuf, int inlen, + void *arg) +{ + int rc, len; + char client_name[32]; + int cmd_id = 0, type = 0, ver = 0, msglen = 0; + csv_t *csv; + ptm_lib_msg_ctxt_t *p_ctxt = NULL; + + len = _ptm_lib_read_ptm_socket(fd, inbuf, PTMLIB_MSG_HDR_LEN); + if (len <= 0) + return (len); + + csv = csv_init(NULL, inbuf, PTMLIB_MSG_HDR_LEN); + + if (!csv) { + DLOG("Cannot allocate csv for hdr\n"); + return -1; + } + + rc = _ptm_lib_decode_header(csv, &msglen, &ver, &type, &cmd_id, + client_name); + + csv_clean(csv); + csv_free(csv); + + if (rc < 0) { + /* could not decode the CSV - maybe its legacy cmd? + * get the entire cmd from the socket and see if we can process + * it + */ + if (len == PTMLIB_MSG_HDR_LEN) { + len += _ptm_lib_read_ptm_socket( + fd, (inbuf + PTMLIB_MSG_HDR_LEN), + inlen - PTMLIB_MSG_HDR_LEN); + if (len <= 0) + return (len); + } + + inbuf[len] = '\0'; + /* we only support the get-status cmd */ + if (strcmp(inbuf, PTMLIB_CMD_GET_STATUS)) { + DLOG("unsupported legacy cmd %s\n", inbuf); + return -1; + } + /* internally create a csv-style cmd */ + ptm_lib_init_msg(hdl, 0, PTMLIB_MSG_TYPE_CMD, NULL, + (void *)&p_ctxt); + if (!p_ctxt) { + DLOG("couldnt allocate context\n"); + return -1; + } + ptm_lib_append_msg(hdl, p_ctxt, "cmd", PTMLIB_CMD_GET_STATUS); + + } else { + + if (msglen > inlen) { + DLOG("msglen [%d] > inlen [%d]\n", msglen, inlen); + return -1; + } + + /* read the rest of the msg */ + len = _ptm_lib_read_ptm_socket(fd, inbuf, msglen); + if (len <= 0) { + return (len); + } + + inbuf[len] = '\0'; + + csv = csv_init(NULL, NULL, PTMLIB_MSG_SZ); + if (!csv) { + ERRLOG("Cannot allocate csv for msg\n"); + return -1; + } + + csv_decode(csv, inbuf); + p_ctxt = calloc(1, sizeof(*p_ctxt)); + if (!p_ctxt) { + ERRLOG("%s: Could not allocate context \n", __func__); + csv_clean(csv); + csv_free(csv); + return -1; + } + + p_ctxt->csv = csv; + p_ctxt->cmd_id = cmd_id; + p_ctxt->type = type; + } + + switch (p_ctxt->type) { + case PTMLIB_MSG_TYPE_NOTIFICATION: + if (hdl->notify_cb) + hdl->notify_cb(arg, p_ctxt); + break; + case PTMLIB_MSG_TYPE_CMD: + if (hdl->cmd_cb) + hdl->cmd_cb(arg, p_ctxt); + break; + case PTMLIB_MSG_TYPE_RESPONSE: + if (hdl->response_cb) + hdl->response_cb(arg, p_ctxt); + break; + default: + return -1; + } + + csv_clean(p_ctxt->csv); + csv_free(p_ctxt->csv); + free(p_ctxt); + + return len; +} + +ptm_lib_handle_t *ptm_lib_register(char *client_name, ptm_cmd_cb cmd_cb, + ptm_notify_cb notify_cb, + ptm_response_cb response_cb) +{ + ptm_lib_handle_t *hdl; + + hdl = calloc(1, sizeof(*hdl)); + + if (hdl) { + strncpy(hdl->client_name, client_name, PTMLIB_MAXNAMELEN - 1); + hdl->cmd_cb = cmd_cb; + hdl->notify_cb = notify_cb; + hdl->response_cb = response_cb; + } + + return hdl; +} + +void ptm_lib_deregister(ptm_lib_handle_t *hdl) +{ + if (hdl) { + memset(hdl, 0x00, sizeof(*hdl)); + free(hdl); + } +} |