lib/services/services

/* */
This source file includes following definitions.
lsb_meta_helper_get_value
services__get_lsb_metadata
services__list_lsb_agents
services__lsb_agent_path
services__lsb_agent_exists
services_action_create
services_list
   1 /*
   2  * Copyright 2010-2020 the Pacemaker project contributors
   3  *
   4  * The version control history for this file may have further details.
   5  *
   6  * This source code is licensed under the GNU Lesser General Public License
   7  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
   8  */
   9 
  10 #include <crm_internal.h>
  11 
  12 #ifndef _GNU_SOURCE
  13 #  define _GNU_SOURCE
  14 #endif
  15 
  16 #include <stdio.h>
  17 #include <errno.h>
  18 #include <sys/stat.h>
  19 
  20 #include <crm/crm.h>
  21 #include <crm/services.h>
  22 #include "services_private.h"
  23 #include "services_lsb.h"
  24 
  25 #define lsb_metadata_template  \
  26     "<?xml version='1.0'?>\n"                                           \
  27     "<!DOCTYPE resource-agent SYSTEM 'ra-api-1.dtd'>\n"                 \
  28     "<resource-agent name='%s' version='" PCMK_DEFAULT_AGENT_VERSION "'>\n" \
  29     "  <version>1.0</version>\n"                                        \
  30     "  <longdesc lang='en'>\n"                                          \
  31     "%s"                                                                \
  32     "  </longdesc>\n"                                                   \
  33     "  <shortdesc lang='en'>%s</shortdesc>\n"                           \
  34     "  <parameters>\n"                                                  \
  35     "  </parameters>\n"                                                 \
  36     "  <actions>\n"                                                     \
  37     "    <action name='meta-data'    timeout='5' />\n"                  \
  38     "    <action name='start'        timeout='15' />\n"                 \
  39     "    <action name='stop'         timeout='15' />\n"                 \
  40     "    <action name='status'       timeout='15' />\n"                 \
  41     "    <action name='restart'      timeout='15' />\n"                 \
  42     "    <action name='force-reload' timeout='15' />\n"                 \
  43     "    <action name='monitor'      timeout='15' interval='15' />\n"   \
  44     "  </actions>\n"                                                    \
  45     "  <special tag='LSB'>\n"                                           \
  46     "    <Provides>%s</Provides>\n"                                     \
  47     "    <Required-Start>%s</Required-Start>\n"                         \
  48     "    <Required-Stop>%s</Required-Stop>\n"                           \
  49     "    <Should-Start>%s</Should-Start>\n"                             \
  50     "    <Should-Stop>%s</Should-Stop>\n"                               \
  51     "    <Default-Start>%s</Default-Start>\n"                           \
  52     "    <Default-Stop>%s</Default-Stop>\n"                             \
  53     "  </special>\n"                                                    \
  54     "</resource-agent>\n"
  55 
  56 /* See "Comment Conventions for Init Scripts" in the LSB core specification at:
  57  * http://refspecs.linuxfoundation.org/lsb.shtml
  58  */
  59 #define LSB_INITSCRIPT_INFOBEGIN_TAG "### BEGIN INIT INFO"
  60 #define LSB_INITSCRIPT_INFOEND_TAG "### END INIT INFO"
  61 #define PROVIDES    "# Provides:"
  62 #define REQ_START   "# Required-Start:"
  63 #define REQ_STOP    "# Required-Stop:"
  64 #define SHLD_START  "# Should-Start:"
  65 #define SHLD_STOP   "# Should-Stop:"
  66 #define DFLT_START  "# Default-Start:"
  67 #define DFLT_STOP   "# Default-Stop:"
  68 #define SHORT_DSCR  "# Short-Description:"
  69 #define DESCRIPTION "# Description:"
  70 
  71 #define lsb_meta_helper_free_value(m)           \
  72     do {                                        \
  73         if ((m) != NULL) {                      \
  74             xmlFree(m);                         \
  75             (m) = NULL;                         \
  76         }                                       \
  77     } while(0)
  78 
  79 /*!
  80  * \internal
  81  * \brief Grab an LSB header value
  82  *
  83  * \param[in]     line    Line read from LSB init script
  84  * \param[in,out] value   If not set, will be set to XML-safe copy of value
  85  * \param[in]     prefix  Set value if line starts with this pattern
  86  *
  87  * \return TRUE if value was set, FALSE otherwise
  88  */
  89 static inline gboolean
  90 lsb_meta_helper_get_value(const char *line, char **value, const char *prefix)
     /*  */
  91 {
  92     if (!*value && pcmk__starts_with(line, prefix)) {
  93         *value = (char *)xmlEncodeEntitiesReentrant(NULL, BAD_CAST line+strlen(prefix));
  94         return TRUE;
  95     }
  96     return FALSE;
  97 }
  98 
  99 #define DESC_MAX 2048
 100 
 101 int
 102 services__get_lsb_metadata(const char *type, char **output)
     /*  */
 103 {
 104     char ra_pathname[PATH_MAX] = { 0, };
 105     FILE *fp = NULL;
 106     char buffer[1024] = { 0, };
 107     char *provides = NULL;
 108     char *req_start = NULL;
 109     char *req_stop = NULL;
 110     char *shld_start = NULL;
 111     char *shld_stop = NULL;
 112     char *dflt_start = NULL;
 113     char *dflt_stop = NULL;
 114     char *s_dscrpt = NULL;
 115     char *xml_l_dscrpt = NULL;
 116     int offset = 0;
 117     bool in_header = FALSE;
 118     char description[DESC_MAX] = { 0, };
 119 
 120     if (type[0] == '/') {
 121         snprintf(ra_pathname, sizeof(ra_pathname), "%s", type);
 122     } else {
 123         snprintf(ra_pathname, sizeof(ra_pathname), "%s/%s",
 124                  LSB_ROOT_DIR, type);
 125     }
 126 
 127     crm_trace("Looking into %s", ra_pathname);
 128     fp = fopen(ra_pathname, "r");
 129     if (fp == NULL) {
 130         return -errno;
 131     }
 132 
 133     /* Enter into the LSB-compliant comment block */
 134     while (fgets(buffer, sizeof(buffer), fp)) {
 135 
 136         // Ignore lines up to and including the block delimiter
 137         if (pcmk__starts_with(buffer, LSB_INITSCRIPT_INFOBEGIN_TAG)) {
 138             in_header = TRUE;
 139             continue;
 140         }
 141         if (!in_header) {
 142             continue;
 143         }
 144 
 145         /* Assume each of the following eight arguments contain one line */
 146         if (lsb_meta_helper_get_value(buffer, &provides, PROVIDES)) {
 147             continue;
 148         }
 149         if (lsb_meta_helper_get_value(buffer, &req_start, REQ_START)) {
 150             continue;
 151         }
 152         if (lsb_meta_helper_get_value(buffer, &req_stop, REQ_STOP)) {
 153             continue;
 154         }
 155         if (lsb_meta_helper_get_value(buffer, &shld_start, SHLD_START)) {
 156             continue;
 157         }
 158         if (lsb_meta_helper_get_value(buffer, &shld_stop, SHLD_STOP)) {
 159             continue;
 160         }
 161         if (lsb_meta_helper_get_value(buffer, &dflt_start, DFLT_START)) {
 162             continue;
 163         }
 164         if (lsb_meta_helper_get_value(buffer, &dflt_stop, DFLT_STOP)) {
 165             continue;
 166         }
 167         if (lsb_meta_helper_get_value(buffer, &s_dscrpt, SHORT_DSCR)) {
 168             continue;
 169         }
 170 
 171         /* Long description may cross multiple lines */
 172         if ((offset == 0) // haven't already found long description
 173             && pcmk__starts_with(buffer, DESCRIPTION)) {
 174             bool processed_line = TRUE;
 175 
 176             // Get remainder of description line itself
 177             offset += snprintf(description, DESC_MAX, "%s",
 178                                buffer + strlen(DESCRIPTION));
 179 
 180             // Read any continuation lines of the description
 181             buffer[0] = '\0';
 182             while (fgets(buffer, sizeof(buffer), fp)) {
 183                 if (pcmk__starts_with(buffer, "#  ")
 184                     || pcmk__starts_with(buffer, "#\t")) {
 185                     /* '#' followed by a tab or more than one space indicates a
 186                      * continuation of the long description.
 187                      */
 188                     offset += snprintf(description + offset, DESC_MAX - offset,
 189                                        "%s", buffer + 1);
 190                 } else {
 191                     /* This line is not part of the long description,
 192                      * so continue with normal processing.
 193                      */
 194                     processed_line = FALSE;
 195                     break;
 196                 }
 197             }
 198 
 199             // Make long description safe to use in XML
 200             xml_l_dscrpt = (char *)xmlEncodeEntitiesReentrant(NULL, BAD_CAST(description));
 201 
 202             if (processed_line) {
 203                 // We grabbed the line into the long description
 204                 continue;
 205             }
 206         }
 207 
 208         // Stop if we leave the header block
 209         if (pcmk__starts_with(buffer, LSB_INITSCRIPT_INFOEND_TAG)) {
 210             break;
 211         }
 212         if (buffer[0] != '#') {
 213             break;
 214         }
 215     }
 216     fclose(fp);
 217 
 218     *output = crm_strdup_printf(lsb_metadata_template, type,
 219                                 (xml_l_dscrpt? xml_l_dscrpt : type),
 220                                 (s_dscrpt? s_dscrpt : type),
 221                                 (provides? provides : ""),
 222                                 (req_start? req_start : ""),
 223                                 (req_stop? req_stop : ""),
 224                                 (shld_start? shld_start : ""),
 225                                 (shld_stop? shld_stop : ""),
 226                                 (dflt_start? dflt_start : ""),
 227                                 (dflt_stop? dflt_stop : ""));
 228 
 229     lsb_meta_helper_free_value(xml_l_dscrpt);
 230     lsb_meta_helper_free_value(s_dscrpt);
 231     lsb_meta_helper_free_value(provides);
 232     lsb_meta_helper_free_value(req_start);
 233     lsb_meta_helper_free_value(req_stop);
 234     lsb_meta_helper_free_value(shld_start);
 235     lsb_meta_helper_free_value(shld_stop);
 236     lsb_meta_helper_free_value(dflt_start);
 237     lsb_meta_helper_free_value(dflt_stop);
 238 
 239     crm_trace("Created fake metadata: %llu",
 240               (unsigned long long) strlen(*output));
 241     return pcmk_ok;
 242 }
 243 
 244 GList *
 245 services__list_lsb_agents(void)
     /*  */
 246 {
 247     return services_os_get_directory_list(LSB_ROOT_DIR, TRUE, TRUE);
 248 }
 249 
 250 char *
 251 services__lsb_agent_path(const char *agent)
     /*  */
 252 {
 253     return (*agent == '/')? strdup(agent)
 254         : crm_strdup_printf("%s/%s", LSB_ROOT_DIR, agent);
 255 }
 256 
 257 bool
 258 services__lsb_agent_exists(const char *agent)
     /*  */
 259 {
 260     bool rc = FALSE;
 261     struct stat st;
 262     char *path = services__lsb_agent_path(agent);
 263 
 264     rc = (stat(path, &st) == 0);
 265     free(path);
 266     return rc;
 267 }
 268 
 269 /* The remaining functions below are not used by the Pacemaker code base, and
 270  * are provided for API compatibility only.
 271  *
 272  * @TODO They should be removed or renamed.
 273  */
 274 
 275 svc_action_t *
 276 services_action_create(const char *name, const char *action,
     /*  */
 277                        guint interval_ms, int timeout)
 278 {
 279     return resources_action_create(name, PCMK_RESOURCE_CLASS_LSB, NULL, name,
 280                                    action, interval_ms, timeout, NULL, 0);
 281 }
 282 
 283 GList *
 284 services_list(void)
     /*  */
 285 {
 286     return resources_list_agents(PCMK_RESOURCE_CLASS_LSB, NULL);
 287 }
 288
/* */
root/lib/services/services_lsb.c

DEFINITIONS
