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-rw-r--r--src/server_state.c931
1 files changed, 931 insertions, 0 deletions
diff --git a/src/server_state.c b/src/server_state.c
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index 0000000..285d23e
--- /dev/null
+++ b/src/server_state.c
@@ -0,0 +1,931 @@
+/*
+ * Server-state management functions.
+ *
+ * Copyright (C) 2021 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
+ *
+ * This program 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 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <errno.h>
+
+#include <import/eb64tree.h>
+#include <import/ebistree.h>
+
+#include <haproxy/api.h>
+#include <haproxy/backend.h>
+#include <haproxy/cfgparse.h>
+#include <haproxy/check.h>
+#include <haproxy/errors.h>
+#include <haproxy/global.h>
+#include <haproxy/log.h>
+#include <haproxy/port_range.h>
+#include <haproxy/proxy.h>
+#include <haproxy/resolvers.h>
+#include <haproxy/server.h>
+#include <haproxy/tools.h>
+#include <haproxy/xxhash.h>
+
+
+/* Update a server state using the parameters available in the params list.
+ * The caller must provide a supported version
+ * Grabs the server lock during operation.
+ */
+static void srv_state_srv_update(struct server *srv, int version, char **params)
+{
+ char *p;
+ struct buffer *msg;
+ const char *warning;
+
+ /* fields since version 1
+ * and common to all other upcoming versions
+ */
+ enum srv_state srv_op_state;
+ enum srv_admin srv_admin_state;
+ unsigned srv_uweight, srv_iweight;
+ unsigned long srv_last_time_change;
+ short srv_check_status;
+ enum chk_result srv_check_result;
+ int srv_check_health;
+ int srv_check_state, srv_agent_state;
+ int bk_f_forced_id;
+ int srv_f_forced_id;
+ int fqdn_set_by_cli;
+ const char *fqdn;
+ const char *port_st;
+ unsigned int port_svc;
+ char *srvrecord;
+ char *addr;
+ int partial_apply = 0;
+#ifdef USE_OPENSSL
+ int use_ssl;
+#endif
+
+ fqdn = NULL;
+ port_svc = 0;
+ msg = alloc_trash_chunk();
+ if (!msg)
+ goto end;
+
+ HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
+
+ /* Only version 1 supported for now, don't check it. Fields are :
+ * srv_addr: params[0]
+ * srv_op_state: params[1]
+ * srv_admin_state: params[2]
+ * srv_uweight: params[3]
+ * srv_iweight: params[4]
+ * srv_last_time_change: params[5]
+ * srv_check_status: params[6]
+ * srv_check_result: params[7]
+ * srv_check_health: params[8]
+ * srv_check_state: params[9]
+ * srv_agent_state: params[10]
+ * bk_f_forced_id: params[11]
+ * srv_f_forced_id: params[12]
+ * srv_fqdn: params[13]
+ * srv_port: params[14]
+ * srvrecord: params[15]
+ * srv_use_ssl: params[16]
+ * srv_check_port: params[17]
+ * srv_check_addr: params[18]
+ * srv_agent_addr: params[19]
+ * srv_agent_port: params[20]
+ */
+
+ /* validating srv_op_state */
+ p = NULL;
+ errno = 0;
+ srv_op_state = strtol(params[1], &p, 10);
+ if ((p == params[1]) || errno == EINVAL || errno == ERANGE ||
+ (srv_op_state != SRV_ST_STOPPED &&
+ srv_op_state != SRV_ST_STARTING &&
+ srv_op_state != SRV_ST_RUNNING &&
+ srv_op_state != SRV_ST_STOPPING)) {
+ chunk_appendf(msg, ", invalid srv_op_state value '%s'", params[1]);
+ }
+
+ /* validating srv_admin_state */
+ p = NULL;
+ errno = 0;
+ srv_admin_state = strtol(params[2], &p, 10);
+ fqdn_set_by_cli = !!(srv_admin_state & SRV_ADMF_HMAINT);
+
+ /* inherited statuses will be recomputed later.
+ * Also disable SRV_ADMF_HMAINT flag (set from stats socket fqdn).
+ */
+ srv_admin_state &= ~SRV_ADMF_IDRAIN & ~SRV_ADMF_IMAINT & ~SRV_ADMF_HMAINT & ~SRV_ADMF_RMAINT;
+
+ if ((p == params[2]) || errno == EINVAL || errno == ERANGE ||
+ (srv_admin_state != 0 &&
+ srv_admin_state != SRV_ADMF_FMAINT &&
+ srv_admin_state != SRV_ADMF_CMAINT &&
+ srv_admin_state != (SRV_ADMF_CMAINT | SRV_ADMF_FMAINT) &&
+ srv_admin_state != (SRV_ADMF_CMAINT | SRV_ADMF_FDRAIN) &&
+ srv_admin_state != SRV_ADMF_FDRAIN)) {
+ chunk_appendf(msg, ", invalid srv_admin_state value '%s'", params[2]);
+ }
+
+ /* validating srv_uweight */
+ p = NULL;
+ errno = 0;
+ srv_uweight = strtol(params[3], &p, 10);
+ if ((p == params[3]) || errno == EINVAL || errno == ERANGE || (srv_uweight > SRV_UWGHT_MAX))
+ chunk_appendf(msg, ", invalid srv_uweight value '%s'", params[3]);
+
+ /* validating srv_iweight */
+ p = NULL;
+ errno = 0;
+ srv_iweight = strtol(params[4], &p, 10);
+ if ((p == params[4]) || errno == EINVAL || errno == ERANGE || (srv_iweight > SRV_UWGHT_MAX))
+ chunk_appendf(msg, ", invalid srv_iweight value '%s'", params[4]);
+
+ /* validating srv_last_time_change */
+ p = NULL;
+ errno = 0;
+ srv_last_time_change = strtol(params[5], &p, 10);
+ if ((p == params[5]) || errno == EINVAL || errno == ERANGE)
+ chunk_appendf(msg, ", invalid srv_last_time_change value '%s'", params[5]);
+
+ /* validating srv_check_status */
+ p = NULL;
+ errno = 0;
+ srv_check_status = strtol(params[6], &p, 10);
+ if (p == params[6] || errno == EINVAL || errno == ERANGE ||
+ (srv_check_status >= HCHK_STATUS_SIZE))
+ chunk_appendf(msg, ", invalid srv_check_status value '%s'", params[6]);
+
+ /* validating srv_check_result */
+ p = NULL;
+ errno = 0;
+ srv_check_result = strtol(params[7], &p, 10);
+ if ((p == params[7]) || errno == EINVAL || errno == ERANGE ||
+ (srv_check_result != CHK_RES_UNKNOWN &&
+ srv_check_result != CHK_RES_NEUTRAL &&
+ srv_check_result != CHK_RES_FAILED &&
+ srv_check_result != CHK_RES_PASSED &&
+ srv_check_result != CHK_RES_CONDPASS)) {
+ chunk_appendf(msg, ", invalid srv_check_result value '%s'", params[7]);
+ }
+
+ /* validating srv_check_health */
+ p = NULL;
+ errno = 0;
+ srv_check_health = strtol(params[8], &p, 10);
+ if (p == params[8] || errno == EINVAL || errno == ERANGE)
+ chunk_appendf(msg, ", invalid srv_check_health value '%s'", params[8]);
+
+ /* validating srv_check_state */
+ p = NULL;
+ errno = 0;
+ srv_check_state = strtol(params[9], &p, 10);
+ if (p == params[9] || errno == EINVAL || errno == ERANGE ||
+ (srv_check_state & ~(CHK_ST_INPROGRESS | CHK_ST_CONFIGURED | CHK_ST_ENABLED | CHK_ST_PAUSED | CHK_ST_AGENT)))
+ chunk_appendf(msg, ", invalid srv_check_state value '%s'", params[9]);
+
+ /* validating srv_agent_state */
+ p = NULL;
+ errno = 0;
+ srv_agent_state = strtol(params[10], &p, 10);
+ if (p == params[10] || errno == EINVAL || errno == ERANGE ||
+ (srv_agent_state & ~(CHK_ST_INPROGRESS | CHK_ST_CONFIGURED | CHK_ST_ENABLED | CHK_ST_PAUSED | CHK_ST_AGENT)))
+ chunk_appendf(msg, ", invalid srv_agent_state value '%s'", params[10]);
+
+ /* validating bk_f_forced_id */
+ p = NULL;
+ errno = 0;
+ bk_f_forced_id = strtol(params[11], &p, 10);
+ if (p == params[11] || errno == EINVAL || errno == ERANGE || !((bk_f_forced_id == 0) || (bk_f_forced_id == 1)))
+ chunk_appendf(msg, ", invalid bk_f_forced_id value '%s'", params[11]);
+
+ /* validating srv_f_forced_id */
+ p = NULL;
+ errno = 0;
+ srv_f_forced_id = strtol(params[12], &p, 10);
+ if (p == params[12] || errno == EINVAL || errno == ERANGE || !((srv_f_forced_id == 0) || (srv_f_forced_id == 1)))
+ chunk_appendf(msg, ", invalid srv_f_forced_id value '%s'", params[12]);
+
+ /* validating srv_fqdn */
+ fqdn = params[13];
+ if (fqdn && *fqdn == '-')
+ fqdn = NULL;
+ if (fqdn && (strlen(fqdn) > DNS_MAX_NAME_SIZE || invalid_domainchar(fqdn))) {
+ chunk_appendf(msg, ", invalid srv_fqdn value '%s'", params[13]);
+ fqdn = NULL;
+ }
+
+ port_st = params[14];
+ if (port_st) {
+ port_svc = strl2uic(port_st, strlen(port_st));
+ if (port_svc > USHRT_MAX) {
+ chunk_appendf(msg, ", invalid srv_port value '%s'", port_st);
+ port_st = NULL;
+ }
+ }
+
+ /* SRV record
+ * NOTE: in HAProxy, SRV records must start with an underscore '_'
+ */
+ srvrecord = params[15];
+ if (srvrecord && *srvrecord != '_')
+ srvrecord = NULL;
+
+ /* don't apply anything if one error has been detected */
+ if (msg->data)
+ goto out;
+ partial_apply = 1;
+
+ /* recover operational state and apply it to this server
+ * and all servers tracking this one */
+ srv->check.health = srv_check_health;
+ switch (srv_op_state) {
+ case SRV_ST_STOPPED:
+ srv->check.health = 0;
+ srv_set_stopped(srv, "changed from server-state after a reload", NULL);
+ break;
+ case SRV_ST_STARTING:
+ /* If rise == 1 there is no STARTING state, let's switch to
+ * RUNNING
+ */
+ if (srv->check.rise == 1) {
+ srv->check.health = srv->check.rise + srv->check.fall - 1;
+ srv_set_running(srv, "", NULL);
+ break;
+ }
+ if (srv->check.health < 1 || srv->check.health >= srv->check.rise)
+ srv->check.health = srv->check.rise - 1;
+ srv->next_state = srv_op_state;
+ break;
+ case SRV_ST_STOPPING:
+ /* If fall == 1 there is no STOPPING state, let's switch to
+ * STOPPED
+ */
+ if (srv->check.fall == 1) {
+ srv->check.health = 0;
+ srv_set_stopped(srv, "changed from server-state after a reload", NULL);
+ break;
+ }
+ if (srv->check.health < srv->check.rise ||
+ srv->check.health > srv->check.rise + srv->check.fall - 2)
+ srv->check.health = srv->check.rise;
+ srv_set_stopping(srv, "changed from server-state after a reload", NULL);
+ break;
+ case SRV_ST_RUNNING:
+ srv->check.health = srv->check.rise + srv->check.fall - 1;
+ srv_set_running(srv, "", NULL);
+ break;
+ }
+
+ /* When applying server state, the following rules apply:
+ * - in case of a configuration change, we apply the setting from the new
+ * configuration, regardless of old running state
+ * - if no configuration change, we apply old running state only if old running
+ * state is different from new configuration state
+ */
+ /* configuration has changed */
+ if ((srv_admin_state & SRV_ADMF_CMAINT) != (srv->next_admin & SRV_ADMF_CMAINT)) {
+ if (srv->next_admin & SRV_ADMF_CMAINT)
+ srv_adm_set_maint(srv);
+ else
+ srv_adm_set_ready(srv);
+ }
+ /* configuration is the same, let's compate old running state and new conf state */
+ else {
+ if (srv_admin_state & SRV_ADMF_FMAINT && !(srv->next_admin & SRV_ADMF_CMAINT))
+ srv_adm_set_maint(srv);
+ else if (!(srv_admin_state & SRV_ADMF_FMAINT) && (srv->next_admin & SRV_ADMF_CMAINT))
+ srv_adm_set_ready(srv);
+ }
+ /* apply drain mode if server is currently enabled */
+ if (!(srv->next_admin & SRV_ADMF_FMAINT) && (srv_admin_state & SRV_ADMF_FDRAIN)) {
+ /* The SRV_ADMF_FDRAIN flag is inherited when srv->iweight is 0
+ * (srv->iweight is the weight set up in configuration).
+ * There are two possible reasons for FDRAIN to have been present :
+ * - previous config weight was zero
+ * - "set server b/s drain" was sent to the CLI
+ *
+ * In the first case, we simply want to drop this drain state
+ * if the new weight is not zero anymore, meaning the administrator
+ * has intentionally turned the weight back to a positive value to
+ * enable the server again after an operation. In the second case,
+ * the drain state was forced on the CLI regardless of the config's
+ * weight so we don't want a change to the config weight to lose this
+ * status. What this means is :
+ * - if previous weight was 0 and new one is >0, drop the DRAIN state.
+ * - if the previous weight was >0, keep it.
+ */
+ if (srv_iweight > 0 || srv->iweight == 0)
+ srv_adm_set_drain(srv);
+ }
+
+ srv->last_change = date.tv_sec - srv_last_time_change;
+ srv->check.status = srv_check_status;
+ srv->check.result = srv_check_result;
+
+ /* Only case we want to apply is removing ENABLED flag which could have been
+ * done by the "disable health" command over the stats socket
+ */
+ if ((srv->check.state & CHK_ST_CONFIGURED) &&
+ (srv_check_state & CHK_ST_CONFIGURED) &&
+ !(srv_check_state & CHK_ST_ENABLED))
+ srv->check.state &= ~CHK_ST_ENABLED;
+
+ /* Only case we want to apply is removing ENABLED flag which could have been
+ * done by the "disable agent" command over the stats socket
+ */
+ if ((srv->agent.state & CHK_ST_CONFIGURED) &&
+ (srv_agent_state & CHK_ST_CONFIGURED) &&
+ !(srv_agent_state & CHK_ST_ENABLED))
+ srv->agent.state &= ~CHK_ST_ENABLED;
+
+ /* We want to apply the previous 'running' weight (srv_uweight) only if there
+ * was no change in the configuration: both previous and new iweight are equals
+ *
+ * It means that a configuration file change has precedence over a unix socket change
+ * for server's weight
+ *
+ * by default, HAProxy applies the following weight when parsing the configuration
+ * srv->uweight = srv->iweight
+ */
+ if (srv_iweight == srv->iweight) {
+ srv->uweight = srv_uweight;
+ }
+ server_recalc_eweight(srv, 1);
+
+ /* load server IP address */
+ if (strcmp(params[0], "-") != 0)
+ srv->lastaddr = strdup(params[0]);
+
+ if (fqdn && srv->hostname) {
+ if (strcmp(srv->hostname, fqdn) == 0) {
+ /* Here we reset the 'set from stats socket FQDN' flag
+ * to support such transitions:
+ * Let's say initial FQDN value is foo1 (in configuration file).
+ * - FQDN changed from stats socket, from foo1 to foo2 value,
+ * - FQDN changed again from file configuration (with the same previous value
+ set from stats socket, from foo1 to foo2 value),
+ * - reload for any other reason than a FQDN modification,
+ * the configuration file FQDN matches the fqdn server state file value.
+ * So we must reset the 'set from stats socket FQDN' flag to be consistent with
+ * any further FQDN modification.
+ */
+ srv->next_admin &= ~SRV_ADMF_HMAINT;
+ }
+ else {
+ /* If the FDQN has been changed from stats socket,
+ * apply fqdn state file value (which is the value set
+ * from stats socket).
+ * Also ensure the runtime resolver will process this resolution.
+ */
+ if (fqdn_set_by_cli) {
+ srv_set_fqdn(srv, fqdn, 0);
+ srv->flags &= ~SRV_F_NO_RESOLUTION;
+ srv->next_admin |= SRV_ADMF_HMAINT;
+ }
+ }
+ }
+ /* If all the conditions below are validated, this means
+ * we're evaluating a server managed by SRV resolution
+ */
+ else if (fqdn && !srv->hostname && srvrecord) {
+ int res;
+ int i;
+ char *tmp;
+
+ /* we can't apply previous state if SRV record has changed */
+ if (!srv->srvrq) {
+ chunk_appendf(msg, ", no SRV resolution for server '%s'. Previous state not applied", srv->id);
+ goto out;
+ }
+ if (strcmp(srv->srvrq->name, srvrecord) != 0) {
+ chunk_appendf(msg, ", SRV record mismatch between configuration ('%s') and state file ('%s) for server '%s'. Previous state not applied", srv->srvrq->name, srvrecord, srv->id);
+ goto out;
+ }
+
+ /* prepare DNS resolution for this server */
+ res = srv_prepare_for_resolution(srv, fqdn);
+ if (res == -1) {
+ chunk_appendf(msg, ", can't allocate memory for DNS resolution for server '%s'", srv->id);
+ goto out;
+ }
+
+ /* Remove from available list and insert in tree
+ * since this server has an hostname
+ */
+ LIST_DEL_INIT(&srv->srv_rec_item);
+ srv->host_dn.key = tmp = strdup(srv->hostname_dn);
+
+ /* convert the key in lowercase because tree
+ * lookup is case sensitive but we don't care
+ */
+ for (i = 0; tmp[i]; i++)
+ tmp[i] = tolower(tmp[i]);
+
+ /* insert in tree and set the srvrq expiration date */
+ ebis_insert(&srv->srvrq->named_servers, &srv->host_dn);
+ task_schedule(srv->srvrq_check, tick_add(now_ms, srv->srvrq->resolvers->hold.timeout));
+
+ /* Unset SRV_F_MAPPORTS for SRV records.
+ * SRV_F_MAPPORTS is unfortunately set by parse_server()
+ * because no ports are provided in the configuration file.
+ * This is because HAProxy will use the port found into the SRV record.
+ */
+ srv->flags &= ~SRV_F_MAPPORTS;
+ }
+
+ if (port_st)
+ srv->svc_port = port_svc;
+
+
+ if (params[16]) {
+#ifdef USE_OPENSSL
+ use_ssl = strtol(params[16], &p, 10);
+
+ /* configure ssl if connection has been initiated at startup */
+ if (srv->ssl_ctx.ctx != NULL)
+ srv_set_ssl(srv, use_ssl);
+#endif
+ }
+
+ port_st = NULL;
+ if (params[17] && strcmp(params[17], "0") != 0)
+ port_st = params[17];
+ addr = NULL;
+ if (params[18] && strcmp(params[18], "-") != 0)
+ addr = params[18];
+ if (addr || port_st) {
+ warning = srv_update_check_addr_port(srv, addr, port_st);
+ if (warning) {
+ chunk_appendf(msg, ", %s", warning);
+ goto out;
+ }
+ }
+
+ port_st = NULL;
+ if (params[20] && strcmp(params[20], "0") != 0)
+ port_st = params[20];
+ addr = NULL;
+ if (params[19] && strcmp(params[19], "-") != 0)
+ addr = params[19];
+ if (addr || port_st) {
+ warning = srv_update_agent_addr_port(srv, addr, port_st);
+ if (warning) {
+ chunk_appendf(msg, ", %s", warning);
+ goto out;
+ }
+ }
+
+ out:
+ HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
+ if (msg->data) {
+ if (partial_apply == 1)
+ ha_warning("server-state partially applied for server '%s/%s'%s\n",
+ srv->proxy->id, srv->id, msg->area);
+ else
+ ha_warning("server-state application failed for server '%s/%s'%s\n",
+ srv->proxy->id, srv->id, msg->area);
+ }
+ end:
+ free_trash_chunk(msg);
+}
+
+/*
+ * Loop on the proxy's servers and try to load its state from <st_tree> using
+ * srv_state_srv_update(). The proxy name and the server name are concatenated
+ * to form the key. If found the entry is removed from the tree.
+ */
+static void srv_state_px_update(const struct proxy *px, int vsn, struct eb_root *st_tree)
+{
+ struct server_state_line *st_line;
+ struct eb64_node *node;
+ struct server *srv;
+ unsigned long key;
+
+ for (srv = px->srv; srv; srv = srv->next) {
+ chunk_printf(&trash, "%s %s", px->id, srv->id);
+ key = XXH3(trash.area, trash.data, 0);
+ node = eb64_lookup(st_tree, key);
+ if (!node)
+ continue; /* next server */
+ st_line = eb64_entry(node, typeof(*st_line), node);
+ srv_state_srv_update(srv, vsn, st_line->params+4);
+
+ /* the node may be released now */
+ eb64_delete(node);
+ free(st_line->line);
+ free(st_line);
+ }
+}
+
+/*
+ * read next line from file <f> and return the server state version if one found.
+ * If no version is found, then 0 is returned
+ * Note that this should be the first read on <f>
+ */
+static int srv_state_get_version(FILE *f) {
+ char mybuf[SRV_STATE_LINE_MAXLEN];
+ char *endptr;
+ long int vsn;
+
+ /* first character of first line of the file must contain the version of the export */
+ if (fgets(mybuf, SRV_STATE_LINE_MAXLEN, f) == NULL)
+ return 0;
+
+ vsn = strtol(mybuf, &endptr, 10);
+ if (endptr == mybuf || *endptr != '\n') {
+ /* Empty or truncated line */
+ return 0;
+ }
+
+ if (vsn < SRV_STATE_FILE_VERSION_MIN || vsn > SRV_STATE_FILE_VERSION_MAX) {
+ /* Wrong version number */
+ return 0;
+ }
+
+ return vsn;
+}
+
+
+/*
+ * parses server state line stored in <buf> and supposedly in version <version>.
+ * Set <params> accordingly on success. It returns 1 on success, 0 if the line
+ * must be ignored and -1 on error.
+ * The caller must provide a supported version
+ */
+static int srv_state_parse_line(char *buf, const int version, char **params)
+{
+ int buflen, arg, ret;
+ char *cur;
+
+ buflen = strlen(buf);
+ cur = buf;
+ ret = 1; /* be optimistic and pretend a success */
+
+ /* we need at least one character and a non-truncated line */
+ if (buflen == 0 || buf[buflen - 1] != '\n') {
+ ret = -1;
+ goto out;
+ }
+
+ /* skip blank characters at the beginning of the line */
+ while (*cur == ' ' || *cur == '\t')
+ ++cur;
+
+ /* ignore empty or commented lines */
+ if (!*cur || *cur == '\n' || *cur == '#') {
+ ret = 0;
+ goto out;
+ }
+
+ /* Removes trailing '\n' to ease parsing */
+ buf[buflen - 1] = '\0';
+
+ /* we're now ready to move the line into <params> */
+ memset(params, 0, SRV_STATE_FILE_MAX_FIELDS * sizeof(*params));
+ arg = 0;
+ while (*cur) {
+ /* first of all, stop if there are too many fields */
+ if (arg >= SRV_STATE_FILE_MAX_FIELDS)
+ break;
+
+ /* then skip leading spaces */
+ while (*cur && (*cur == ' ' || *cur == '\t')) {
+ ++cur;
+ if (!*cur)
+ break;
+ }
+
+ /*
+ * idx:
+ * be_id: params[0]
+ * be_name: params[1]
+ * srv_id: params[2]
+ * srv_name: params[3]
+ * v1
+ * srv_addr: params[4]
+ * srv_op_state: params[5]
+ * srv_admin_state: params[6]
+ * srv_uweight: params[7]
+ * srv_iweight: params[8]
+ * srv_last_time_change: params[9]
+ * srv_check_status: params[10]
+ * srv_check_result: params[11]
+ * srv_check_health: params[12]
+ * srv_check_state: params[13]
+ * srv_agent_state: params[14]
+ * bk_f_forced_id: params[15]
+ * srv_f_forced_id: params[16]
+ * srv_fqdn: params[17]
+ * srv_port: params[18]
+ * srvrecord: params[19]
+ *
+ * srv_use_ssl: params[20] (optional field)
+ * srv_check_port: params[21] (optional field)
+ * srv_check_addr: params[22] (optional field)
+ * srv_agent_addr: params[23] (optional field)
+ * srv_agent_port: params[24] (optional field)
+ *
+ */
+ params[arg++] = cur;
+
+ /* look for the end of the current field */
+ while (*cur && *cur != ' ' && *cur != '\t') {
+ ++cur;
+ if (!*cur)
+ break;
+ }
+
+ /* otherwise, cut the field and move to the next one */
+ *cur++ = '\0';
+ }
+
+ /* if the number of fields does not match the version, then return an error */
+ if (version == 1 &&
+ (arg < SRV_STATE_FILE_MIN_FIELDS_VERSION_1 ||
+ arg > SRV_STATE_FILE_MAX_FIELDS_VERSION_1))
+ ret = -1;
+
+ out:
+ return ret;
+}
+
+
+/*
+ * parses a server state line using srv_state_parse_line() and store the result
+ * in <st_tree>. If an error occurred during the parsing, the line is
+ * ignored. if <px> is defined, it is used to check the backend id/name against
+ * the parsed params and to compute the key of the line.
+ */
+static int srv_state_parse_and_store_line(char *line, int vsn, struct eb_root *st_tree,
+ struct proxy *px)
+{
+ struct server_state_line *st_line;
+ int ret = 0;
+
+ /* store line in tree and duplicate the line */
+ st_line = calloc(1, sizeof(*st_line));
+ if (st_line == NULL)
+ goto skip_line;
+ st_line->line = strdup(line);
+ if (st_line->line == NULL)
+ goto skip_line;
+
+ ret = srv_state_parse_line(st_line->line, vsn, st_line->params);
+ if (ret <= 0)
+ goto skip_line;
+
+ /* Check backend name against params if <px> is defined */
+ if (px) {
+ int check_id = (atoi(st_line->params[0]) == px->uuid);
+ int check_name = (strcmp(px->id, st_line->params[1]) == 0);
+ int bk_f_forced_id = (atoi(st_line->params[15]) & PR_O_FORCED_ID);
+
+
+ if (!check_id && !check_name) {
+ /* backend does not match at all: skip the line */
+ goto skip_line;
+ }
+ else if (!check_id) {
+ /* Id mismatch: warn but continue */
+ ha_warning("Proxy '%s': backend ID mismatch: from server state file: '%s', from running config '%d'\n",
+ px->id, st_line->params[0], px->uuid);
+ send_log(px, LOG_NOTICE, "backend ID mismatch: from server state file: '%s', from running config '%d'\n",
+ st_line->params[0], px->uuid);
+ }
+ else if (!check_name) {
+ /* Name mismatch: warn and skip the line, except if the backend id was forced
+ * in the previous configuration */
+ ha_warning("Proxy '%s': backend name mismatch: from server state file: '%s', from running config '%s'\n",
+ px->id, st_line->params[1], px->id);
+ send_log(px, LOG_NOTICE, "backend name mismatch: from server state file: '%s', from running config '%s'\n",
+ st_line->params[1], px->id);
+ if (!bk_f_forced_id)
+ goto skip_line;
+ }
+ }
+
+ /*
+ * The key: "be_name srv_name"
+ * if <px> is defined: be_name == px->id
+ * otherwise: be_name == params[1]
+ */
+ chunk_printf(&trash, "%s %s", (px ? px->id : st_line->params[1]), st_line->params[3]);
+ st_line->node.key = XXH3(trash.area, trash.data, 0);
+ if (eb64_insert(st_tree, &st_line->node) != &st_line->node) {
+ /* this is a duplicate key, probably a hand-crafted file, drop it! */
+ goto skip_line;
+ }
+
+ return ret;
+
+ skip_line:
+ /* free up memory in case of error during the processing of the line */
+ if (st_line) {
+ free(st_line->line);
+ free(st_line);
+ }
+ return ret;
+}
+
+/* Helper function to get the server-state file path.
+ * If <filename> starts with a '/', it is considered as an absolute path. In
+ * this case or if <global.server_state_base> is not set, <filename> only is
+ * considered. Otherwise, the <global.server_state_base> is concatenated to
+ * <filename> to produce the file path and copied to <dst_path>. in both cases,
+ * the result must not exceeds <maxpathlen>.
+ *
+ * The len is returned on success or -1 if the path is too long. On error, the
+ * caller must not rely on <dst_path>.
+ */
+static inline int srv_state_get_filepath(char *dst_path, int maxpathlen, const char *filename)
+{
+ char *sep;
+ int len = 0;
+
+ /* create the globalfilepath variable */
+ if (*filename == '/' || !global.server_state_base) {
+ /* absolute path or no base directory provided */
+ len = strlcpy2(dst_path, filename, maxpathlen);
+ }
+ else {
+ /* concat base directory and global server-state file */
+ sep = (global.server_state_base[strlen(global.server_state_base)-1] != '/' ? "/": "");
+ len = snprintf(dst_path, maxpathlen, "%s%s%s", global.server_state_base, sep, filename);
+ }
+ return (len < maxpathlen ? len: -1);
+}
+
+
+/* This function parses all the proxies and only take care of the backends (since we're looking for server)
+ * For each proxy, it does the following:
+ * - opens its server state file (either one or local one)
+ * - read whole file, line by line
+ * - analyse each line to check if it matches our current backend:
+ * - backend name matches
+ * - backend id matches if id is forced and name doesn't match
+ * - if the server pointed by the line is found, then state is applied
+ *
+ * If the running backend uuid or id differs from the state file, then HAProxy reports
+ * a warning.
+ *
+ * Grabs the server's lock via srv_state_srv_update().
+ */
+void apply_server_state(void)
+{
+ /* tree where global state_file is loaded */
+ struct eb_root global_state_tree = EB_ROOT_UNIQUE;
+ struct proxy *curproxy;
+ struct server_state_line *st_line;
+ struct eb64_node *node, *next_node;
+ FILE *f;
+ char mybuf[SRV_STATE_LINE_MAXLEN];
+ char file[MAXPATHLEN];
+ int local_vsn, global_vsn, len, linenum;
+
+ global_vsn = 0; /* no global file */
+ if (!global.server_state_file)
+ goto no_globalfile;
+ len = srv_state_get_filepath(file, MAXPATHLEN, global.server_state_file);
+ if (len == -1) {
+ ha_warning("config: Can't load global server state file: file too long.\n");
+ goto no_globalfile;
+ }
+
+ /* Load global server state in a tree */
+ errno = 0;
+ f = fopen(file, "r");
+ if (!f) {
+ ha_warning("config: Can't open global server state file '%s': %s\n", file, strerror(errno));
+ goto no_globalfile;
+ }
+
+ global_vsn = srv_state_get_version(f);
+ if (global_vsn == 0) {
+ ha_warning("config: Can't get version of the global server state file '%s'.\n",
+ file);
+ goto close_globalfile;
+ }
+
+ for (linenum = 1; fgets(mybuf, SRV_STATE_LINE_MAXLEN, f); linenum++) {
+ int ret;
+
+ ret = srv_state_parse_and_store_line(mybuf, global_vsn, &global_state_tree, NULL);
+ if (ret == -1) {
+ ha_warning("config: corrupted global server state file '%s' at line %d.\n",
+ file, linenum);
+ global_vsn = 0;
+ break;
+ }
+ }
+
+ close_globalfile:
+ fclose(f);
+
+ no_globalfile:
+ /* parse all proxies and load states form tree (global file) or from local file */
+ for (curproxy = proxies_list; curproxy != NULL; curproxy = curproxy->next) {
+ struct eb_root local_state_tree = EB_ROOT_UNIQUE;
+
+ /* Must be an enabled backend with at least a server */
+ if (!(curproxy->cap & PR_CAP_BE) || (curproxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) || !curproxy->srv)
+ continue; /* next proxy */
+
+ /* Mode must be specified */
+ BUG_ON(curproxy->load_server_state_from_file == PR_SRV_STATE_FILE_UNSPEC);
+
+ /* No server-state file for this proxy */
+ if (curproxy->load_server_state_from_file == PR_SRV_STATE_FILE_NONE)
+ continue; /* next proxy */
+
+ if (curproxy->load_server_state_from_file == PR_SRV_STATE_FILE_GLOBAL) {
+ /* when global file is used, we get data from the tree
+ * Note that in such case we don't check backend name neither uuid.
+ * Backend name can't be wrong since it's used as a key to retrieve the server state
+ * line from the tree.
+ */
+ if (global_vsn)
+ srv_state_px_update(curproxy, global_vsn, &global_state_tree);
+ continue; /* next proxy */
+ }
+
+ /*
+ * Here we load a local server state-file
+ */
+
+ /* create file variable */
+ len = srv_state_get_filepath(file, MAXPATHLEN, curproxy->server_state_file_name);
+ if (len == -1) {
+ ha_warning("Proxy '%s': Can't load local server state file: file too long.\n", curproxy->id);
+ continue; /* next proxy */
+ }
+
+ /* Load local server state in a tree */
+ errno = 0;
+ f = fopen(file, "r");
+ if (!f) {
+ ha_warning("Proxy '%s': Can't open server state file '%s': %s.\n",
+ curproxy->id, file, strerror(errno));
+ continue; /* next proxy */
+ }
+
+ /* first character of first line of the file must contain the version of the export */
+ local_vsn = srv_state_get_version(f);
+ if (local_vsn == 0) {
+ ha_warning("Proxy '%s': Can't get version of the server state file '%s'.\n",
+ curproxy->id, file);
+ goto close_localfile;
+ }
+
+ /* First, parse lines of the local server-state file and store them in a eb-tree */
+ for (linenum = 1; fgets(mybuf, SRV_STATE_LINE_MAXLEN, f); linenum++) {
+ int ret;
+
+ ret = srv_state_parse_and_store_line(mybuf, local_vsn, &local_state_tree, curproxy);
+ if (ret == -1) {
+ ha_warning("Proxy '%s': corrupted server state file '%s' at line %d.\n",
+ curproxy->id, file, linenum);
+ local_vsn = 0;
+ break;
+ }
+ }
+
+ if (local_vsn)
+ srv_state_px_update(curproxy, local_vsn, &local_state_tree);
+
+ /* Remove unused server-state lines */
+ node = eb64_first(&local_state_tree);
+ while (node) {
+ st_line = eb64_entry(node, typeof(*st_line), node);
+ next_node = eb64_next(node);
+ eb64_delete(node);
+
+ if (local_vsn) {
+ /* if no server found, then warn */
+ ha_warning("Proxy '%s': can't find server '%s' in backend '%s'\n",
+ curproxy->id, st_line->params[3], curproxy->id);
+ send_log(curproxy, LOG_NOTICE, "can't find server '%s' in backend '%s'\n",
+ st_line->params[3], curproxy->id);
+ }
+
+ free(st_line->line);
+ free(st_line);
+ node = next_node;
+ }
+
+ close_localfile:
+ fclose(f);
+ }
+
+ node = eb64_first(&global_state_tree);
+ while (node) {
+ st_line = eb64_entry(node, typeof(*st_line), node);
+ next_node = eb64_next(node);
+ eb64_delete(node);
+ free(st_line->line);
+ free(st_line);
+ node = next_node;
+ }
+}