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37c74da44fc2debe3b2e9f4558b259e5062e3260
open5gs/src/amf/ue-info.c
Bostjan Meglic 37c74da44f [ue-info] consolidate page/page size for ue-info API interface 
Remove function pointers to set page/page sizes per info type
(UE/PDU/gNB/eNB info). Instead, call dumpers functions with this
information as function arguments.
2025-10-17 08:30:45 +09:00

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/*
* Copyright (C) 2025 by Juraj Elias <juraj.elias@gmail.com>
*
* This file is part of Open5GS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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. If not, see <https://www.gnu.org/licenses/>.
*/
/*
* Connected AMF UEs JSON dumper for the Prometheus HTTP server (/ue-info).
* - supi, suci, pei, cm_state, guti,m_tmsi, gnb_info, location, security, ambr, slices, am_policy
* - pager: /ue-info?page=0&page_size=100 (0-based, page=-1 without paging) Default: page=0 page_size=100=MAXSIZE
*
* path: http://AMF_IP:9090/ue-info
* curl -s "http://127.0.0.5:9090/ue-info" |jq .
* {
* "items": [
* {
* "supi": "imsi-001010000056492",
* "suci": "suci-0-001-01-0000-1-1-85731c4241d466407311a85135e914987944f361550f13f4532e29bdc5859548a363cc1a81798bb4cc59f2b4db",
* "pei": "imeisv-3535938300494715",
* "cm_state": "connected",
* "guti": "00101-030080-CC00007AB",
* "m_tmsi": 3221227435,
* "gnb": {
* "ostream_id": 1,
* "amf_ue_ngap_id": 2,
* "ran_ue_ngap_id": 39,
* "gnb_id": 100,
* "cell_id": 1
* },
* "location": {
* "timestamp": 1758733375895512,
* "nr_tai": {
* "plmn": "99970",
* "tac_hex": "000001",
* "tac": 1
* },
* "nr_cgi": {
* "plmn": "99970",
* "nci": 1638401,
* "gnb_id": 100,
* "cell_id": 1
* },
* "last_visited_plmn_id": "000000"
* },
* "msisdn": [],
* "security": {
* "valid": 1,
* "enc": "nea2",
* "int": "nia2"
* },
* "ambr": {
* "downlink": 1000000000,
* "uplink": 1000000000
* },
* "pdu_sessions": [],
* "pdu_sessions_count": 0,
* "requested_slices": [
* {
* "sst": 1,
* "sd": "ffffff"
* }
* ],
* "allowed_slices": [
* {
* "sst": 1,
* "sd": "ffffff"
* }
* ],
* "requested_slices_count": 1,
* "allowed_slices_count": 1,
* "am_policy_features": 4,
* "am_policy_features_info": {
* "hex": "0x0000000000000004",
* "bits": [
* 2
* ],
* "labels": [
* "QoS Policy Control"
* ]
* }
* }
* ],
* "pager": {
* "page": 0,
* "page_size": 100,
* "count": 2
* }
* }
*/
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <inttypes.h>
#include <string.h>
#include "ogs-core.h"
#include "ogs-proto.h"
#include "context.h"
#include "ue-info.h"
#include "sbi/openapi/external/cJSON.h"
#include "metrics/prometheus/json_pager.h"
size_t amf_dump_ue_info(char *buf, size_t buflen, size_t page, size_t page_size)
{
page_size = page_size ? page_size : 100;
if (page_size > 100) page_size = 100;
return amf_dump_ue_info_paged(buf, buflen, page, page_size);
}
static inline uint32_t u24_to_u32(ogs_uint24_t v)
{
uint32_t x = 0;
memcpy(&x, &v, sizeof(v) < sizeof(x) ? sizeof(v) : sizeof(x));
return (x & 0xFFFFFFu);
}
static inline void bytes3_to_hex_lower(const void *p, char out[7])
{
const uint8_t *b = (const uint8_t *)p;
static const char *hx = "0123456789abcdef";
out[0] = hx[(b[0] >> 4) & 0xF];
out[1] = hx[b[0] & 0xF];
out[2] = hx[(b[1] >> 4) & 0xF];
out[3] = hx[b[1] & 0xF];
out[4] = hx[(b[2] >> 4) & 0xF];
out[5] = hx[b[2] & 0xF];
out[6] = '\0';
}
/* AM policy feature labels */
static const char *am_policy_feature_names[64] = {
/*0*/ "AM Policy Association",
/*1*/ "Slice-specific Policy",
/*2*/ "QoS Policy Control",
/*3*/ "Access & Mobility Policy",
/*4*/ "Charging Policy",
/*5*/ "Traffic Steering",
/*6*/ "Roaming Policy",
/*7*/ "Emergency Services Policy",
/*8*/ "UE Policy",
/*9*/ "Session Continuity Policy",
/*10*/ "Application-based Policy",
/*11*/ "Location-based Policy",
/*12*/ "Time-based Policy",
/*13*/ "Data Network Selection",
/*14*/ "Policy Update Notification",
/*15*/ "Policy Control Event Exposure",
};
/* -------- JSON builders: 0=OK, -1=OOM. Children are attached only when complete. -------- */
static int add_snssai_sd_string(cJSON *obj, const char *key, const void *sd_ptr)
{
char sd_hex[7] = "ffffff";
if (sd_ptr) bytes3_to_hex_lower(sd_ptr, sd_hex);
cJSON *s = cJSON_CreateString(sd_hex);
if (!s) return -1;
cJSON_AddItemToObjectCS(obj, key, s);
return 0;
}
static int add_basic_identity(cJSON *o, const amf_ue_t *ue)
{
if (ue->supi && ue->supi[0]) {
cJSON *v = cJSON_CreateString(ue->supi); if (!v) return -1;
cJSON_AddItemToObjectCS(o, "supi", v);
}
if (ue->suci && ue->suci[0]) {
cJSON *v = cJSON_CreateString(ue->suci); if (!v) return -1;
cJSON_AddItemToObjectCS(o, "suci", v);
}
if (ue->pei && ue->pei[0]) {
cJSON *v = cJSON_CreateString(ue->pei); if (!v) return -1;
cJSON_AddItemToObjectCS(o, "pei", v);
}
{
const char *cm = CM_CONNECTED(ue) ? "connected" : "idle";
cJSON *v = cJSON_CreateString(cm); if (!v) return -1;
cJSON_AddItemToObjectCS(o, "cm_state", v);
}
/* If M-TMSI present, expose GUTI string and m_tmsi numeric */
if (ue->current.m_tmsi) {
char plmn_str[OGS_PLMNIDSTRLEN] = {0};
ogs_plmn_id_to_string(&ue->guami->plmn_id, plmn_str);
/* ogs_amf_id_to_string() returns heap memory — free it */
char *amf_hex = ogs_amf_id_to_string(&ue->guami->amf_id);
const char *amf_str = amf_hex ? amf_hex : "";
char guti_buf[80];
(void)snprintf(guti_buf, sizeof guti_buf, "%s-%s-C%08X",
plmn_str, amf_str, (unsigned)ue->current.guti.m_tmsi);
cJSON *g = cJSON_CreateString(guti_buf);
if (amf_hex) ogs_free(amf_hex);
if (!g) return -1;
cJSON_AddItemToObjectCS(o, "guti", g);
cJSON *m = cJSON_CreateNumber((double)ue->current.guti.m_tmsi);
if (!m) return -1;
cJSON_AddItemToObjectCS(o, "m_tmsi", m);
}
return 0;
}
static int add_gnb(cJSON *parent, const amf_ue_t *ue)
{
cJSON *gnb = cJSON_CreateObject();
if (!gnb) return -1;
cJSON *osid = cJSON_CreateNumber((double)ue->gnb_ostream_id);
if (!osid) { cJSON_Delete(gnb); return -1; }
cJSON_AddItemToObjectCS(gnb, "ostream_id", osid);
ran_ue_t *ran = ran_ue_find_by_id(ue->ran_ue_id);
if (ran) {
uint64_t nci = ue->nr_cgi.cell_id & 0xFFFFFFFFFULL; /* 36-bit */
uint32_t gnb_id = (uint32_t)((nci >> 14) & 0x3FFFFF);
uint32_t cell_id = (uint32_t)(nci & 0x3FFF);
cJSON *a = cJSON_CreateNumber((double)ran->amf_ue_ngap_id);
cJSON *r = cJSON_CreateNumber((double)ran->ran_ue_ngap_id);
cJSON *g = cJSON_CreateNumber((double)gnb_id);
cJSON *c = cJSON_CreateNumber((double)cell_id);
if (!a || !r || !g || !c) {
if (a) cJSON_Delete(a);
if (r) cJSON_Delete(r);
if (g) cJSON_Delete(g);
if (c) cJSON_Delete(c);
cJSON_Delete(gnb);
return -1;
}
cJSON_AddItemToObjectCS(gnb, "amf_ue_ngap_id", a);
cJSON_AddItemToObjectCS(gnb, "ran_ue_ngap_id", r);
cJSON_AddItemToObjectCS(gnb, "gnb_id", g);
cJSON_AddItemToObjectCS(gnb, "cell_id", c);
} else {
cJSON *st = cJSON_CreateString("not-connected");
if (!st) { cJSON_Delete(gnb); return -1; }
cJSON_AddItemToObjectCS(gnb, "status", st);
}
cJSON_AddItemToObjectCS(parent, "gnb", gnb);
return 0;
}
static int add_location(cJSON *parent, const amf_ue_t *ue)
{
cJSON *loc = cJSON_CreateObject();
if (!loc) return -1;
cJSON *ts = cJSON_CreateNumber((double)ue->ue_location_timestamp);
if (!ts) { cJSON_Delete(loc); return -1; }
cJSON_AddItemToObjectCS(loc, "timestamp", ts);
/* nr_tai */
{
cJSON *tai = cJSON_CreateObject();
if (!tai) { cJSON_Delete(loc); return -1; }
char plmn_str[OGS_PLMNIDSTRLEN] = {0};
ogs_plmn_id_to_string(&ue->nr_tai.plmn_id, plmn_str);
cJSON *p = cJSON_CreateString(plmn_str);
if (!p) { cJSON_Delete(tai); cJSON_Delete(loc); return -1; }
cJSON_AddItemToObjectCS(tai, "plmn", p);
char tac_hex[7];
(void)snprintf(tac_hex, sizeof tac_hex, "%06x", (unsigned)u24_to_u32(ue->nr_tai.tac));
cJSON *th = cJSON_CreateString(tac_hex);
cJSON *tn = cJSON_CreateNumber((double)u24_to_u32(ue->nr_tai.tac));
if (!th || !tn) { if (th) cJSON_Delete(th); if (tn) cJSON_Delete(tn); cJSON_Delete(tai); cJSON_Delete(loc); return -1; }
cJSON_AddItemToObjectCS(tai, "tac_hex", th);
cJSON_AddItemToObjectCS(tai, "tac", tn);
cJSON_AddItemToObjectCS(loc, "nr_tai", tai);
}
/* nr_cgi */
{
cJSON *cgi = cJSON_CreateObject();
if (!cgi) { cJSON_Delete(loc); return -1; }
char plmn_str[OGS_PLMNIDSTRLEN] = {0};
ogs_plmn_id_to_string(&ue->nr_cgi.plmn_id, plmn_str);
cJSON *p = cJSON_CreateString(plmn_str);
if (!p) { cJSON_Delete(cgi); cJSON_Delete(loc); return -1; }
cJSON_AddItemToObjectCS(cgi, "plmn", p);
uint64_t nci = ue->nr_cgi.cell_id & 0xFFFFFFFFFULL; /* 36-bit */
uint32_t gnb_id = (uint32_t)((nci >> 14) & 0x3FFFFF);
uint32_t cell_id = (uint32_t)(nci & 0x3FFF);
cJSON *n = cJSON_CreateNumber((double)nci);
cJSON *g = cJSON_CreateNumber((double)gnb_id);
cJSON *c = cJSON_CreateNumber((double)cell_id);
if (!n || !g || !c) { if (n) cJSON_Delete(n); if (g) cJSON_Delete(g); if (c) cJSON_Delete(c); cJSON_Delete(cgi); cJSON_Delete(loc); return -1; }
cJSON_AddItemToObjectCS(cgi, "nci", n);
cJSON_AddItemToObjectCS(cgi, "gnb_id", g);
cJSON_AddItemToObjectCS(cgi, "cell_id", c);
cJSON_AddItemToObjectCS(loc, "nr_cgi", cgi);
}
/* last_visited_plmn_id */
{
char plmn_str[OGS_PLMNIDSTRLEN] = {0};
ogs_plmn_id_to_string(&ue->last_visited_plmn_id, plmn_str);
cJSON *lv = cJSON_CreateString(plmn_str);
if (!lv) { cJSON_Delete(loc); return -1; }
cJSON_AddItemToObjectCS(loc, "last_visited_plmn_id", lv);
}
cJSON_AddItemToObjectCS(parent, "location", loc);
return 0;
}
static int add_msisdn_array(cJSON *parent, const amf_ue_t *ue)
{
cJSON *arr = cJSON_CreateArray();
if (!arr) return -1;
for (int i = 0; i < ue->num_of_msisdn; i++) {
if (!ue->msisdn[i] || !ue->msisdn[i][0]) continue;
cJSON *s = cJSON_CreateString(ue->msisdn[i]);
if (!s) { cJSON_Delete(arr); return -1; }
cJSON_AddItemToArray(arr, s);
}
cJSON_AddItemToObjectCS(parent, "msisdn", arr);
return 0;
}
static int add_security(cJSON *parent, const amf_ue_t *ue)
{
cJSON *sec = cJSON_CreateObject();
if (!sec) return -1;
{
int valid_ctx = SECURITY_CONTEXT_IS_VALID(ue);
cJSON *v = cJSON_CreateNumber((double)valid_ctx);
if (!v) { cJSON_Delete(sec); return -1; }
cJSON_AddItemToObjectCS(sec, "valid", v);
}
const char *enc =
ue->selected_enc_algorithm == OGS_NAS_SECURITY_ALGORITHMS_128_NEA2 ? "nea2" :
ue->selected_enc_algorithm == OGS_NAS_SECURITY_ALGORITHMS_128_NEA1 ? "nea1" :
ue->selected_enc_algorithm == OGS_NAS_SECURITY_ALGORITHMS_128_NEA3 ? "nea3" : "nea0";
const char *integ =
ue->selected_int_algorithm == OGS_NAS_SECURITY_ALGORITHMS_128_NIA2 ? "nia2" :
ue->selected_int_algorithm == OGS_NAS_SECURITY_ALGORITHMS_128_NIA1 ? "nia1" :
ue->selected_int_algorithm == OGS_NAS_SECURITY_ALGORITHMS_128_NIA3 ? "nia3" : "nia0";
cJSON *e = cJSON_CreateString(enc);
cJSON *i = cJSON_CreateString(integ);
if (!e || !i) { if (e) cJSON_Delete(e); if (i) cJSON_Delete(i); cJSON_Delete(sec); return -1; }
cJSON_AddItemToObjectCS(sec, "enc", e);
cJSON_AddItemToObjectCS(sec, "int", i);
cJSON_AddItemToObjectCS(parent, "security", sec);
return 0;
}
static int add_ambr(cJSON *parent, const amf_ue_t *ue)
{
cJSON *ambr = cJSON_CreateObject();
if (!ambr) return -1;
cJSON *dl = cJSON_CreateNumber((double)ue->ue_ambr.downlink);
cJSON *ul = cJSON_CreateNumber((double)ue->ue_ambr.uplink);
if (!dl || !ul) { if (dl) cJSON_Delete(dl); if (ul) cJSON_Delete(ul); cJSON_Delete(ambr); return -1; }
cJSON_AddItemToObjectCS(ambr, "downlink", dl);
cJSON_AddItemToObjectCS(ambr, "uplink", ul);
cJSON_AddItemToObjectCS(parent, "ambr", ambr);
return 0;
}
static int add_pdu_sessions(cJSON *parent, const amf_ue_t *ue)
{
cJSON *arr = cJSON_CreateArray();
if (!arr) return -1;
int count = 0;
amf_sess_t *sess = NULL;
ogs_list_for_each(&(ue->sess_list), sess) {
cJSON *it = cJSON_CreateObject();
if (!it) { cJSON_Delete(arr); return -1; }
/* PSI */
{
cJSON *n = cJSON_CreateNumber((double)sess->psi);
if (!n) { cJSON_Delete(it); cJSON_Delete(arr); return -1; }
cJSON_AddItemToObjectCS(it, "psi", n);
}
/* DNN */
if (sess->dnn && sess->dnn[0]) {
cJSON *d = cJSON_CreateString(sess->dnn);
if (!d) { cJSON_Delete(it); cJSON_Delete(arr); return -1; }
cJSON_AddItemToObjectCS(it, "dnn", d);
}
/* S-NSSAI */
{
cJSON *sn = cJSON_CreateObject();
if (!sn) { cJSON_Delete(it); cJSON_Delete(arr); return -1; }
cJSON *sst = cJSON_CreateNumber((double)sess->s_nssai.sst);
if (!sst) { cJSON_Delete(sn); cJSON_Delete(it); cJSON_Delete(arr); return -1; }
cJSON_AddItemToObjectCS(sn, "sst", sst);
if (add_snssai_sd_string(sn, "sd", &sess->s_nssai.sd) < 0) { cJSON_Delete(sn); cJSON_Delete(it); cJSON_Delete(arr); return -1; }
cJSON_AddItemToObjectCS(it, "snssai", sn);
}
/* Flags/counters mirrored as-is */
{
cJSON *lbo = cJSON_CreateBool(sess->lbo_roaming_allowed);
cJSON *rs = cJSON_CreateNumber((double)sess->resource_status);
cJSON *n1 = cJSON_CreateBool(sess->n1_released);
cJSON *n2 = cJSON_CreateBool(sess->n2_released);
if (!lbo || !rs || !n1 || !n2) {
if (lbo) cJSON_Delete(lbo);
if (rs) cJSON_Delete(rs);
if (n1) cJSON_Delete(n1);
if (n2) cJSON_Delete(n2);
cJSON_Delete(it);
cJSON_Delete(arr);
return -1;
}
cJSON_AddItemToObjectCS(it, "lbo_roaming_allowed", lbo);
cJSON_AddItemToObjectCS(it, "resource_status", rs);
cJSON_AddItemToObjectCS(it, "n1_released", n1);
cJSON_AddItemToObjectCS(it, "n2_released", n2);
}
cJSON_AddItemToArray(arr, it);
count++;
}
cJSON_AddItemToObjectCS(parent, "pdu_sessions", arr);
{
cJSON *n = cJSON_CreateNumber((double)count);
if (!n) return -1;
cJSON_AddItemToObjectCS(parent, "pdu_sessions_count", n);
}
return 0;
}
static int add_requested_allowed_slices(cJSON *parent, const amf_ue_t *ue)
{
cJSON *req = cJSON_CreateArray();
cJSON *allow = cJSON_CreateArray();
if (!req || !allow) { if (req) cJSON_Delete(req); if (allow) cJSON_Delete(allow); return -1; }
/* requested */
for (int i = 0; i < ue->requested_nssai.num_of_s_nssai; i++) {
const ogs_nas_s_nssai_ie_t *ie = &ue->requested_nssai.s_nssai[i];
cJSON *sn = cJSON_CreateObject();
if (!sn) { cJSON_Delete(req); cJSON_Delete(allow); return -1; }
cJSON *sst = cJSON_CreateNumber((double)ie->sst);
if (!sst) { cJSON_Delete(sn); cJSON_Delete(req); cJSON_Delete(allow); return -1; }
cJSON_AddItemToObjectCS(sn, "sst", sst);
if (add_snssai_sd_string(sn, "sd", &ie->sd) < 0) { cJSON_Delete(sn); cJSON_Delete(req); cJSON_Delete(allow); return -1; }
cJSON_AddItemToArray(req, sn);
}
/* allowed */
for (int i = 0; i < ue->allowed_nssai.num_of_s_nssai; i++) {
const ogs_nas_s_nssai_ie_t *ie = &ue->allowed_nssai.s_nssai[i];
cJSON *sn = cJSON_CreateObject();
if (!sn) { cJSON_Delete(req); cJSON_Delete(allow); return -1; }
cJSON *sst = cJSON_CreateNumber((double)ie->sst);
if (!sst) { cJSON_Delete(sn); cJSON_Delete(req); cJSON_Delete(allow); return -1; }
cJSON_AddItemToObjectCS(sn, "sst", sst);
if (add_snssai_sd_string(sn, "sd", &ie->sd) < 0) { cJSON_Delete(sn); cJSON_Delete(req); cJSON_Delete(allow); return -1; }
cJSON_AddItemToArray(allow, sn);
}
cJSON_AddItemToObjectCS(parent, "requested_slices", req);
cJSON_AddItemToObjectCS(parent, "allowed_slices", allow);
cJSON *rc = cJSON_CreateNumber((double)ue->requested_nssai.num_of_s_nssai);
cJSON *ac = cJSON_CreateNumber((double)ue->allowed_nssai.num_of_s_nssai);
if (!rc || !ac) { if (rc) cJSON_Delete(rc); if (ac) cJSON_Delete(ac); return -1; }
cJSON_AddItemToObjectCS(parent, "requested_slices_count", rc);
cJSON_AddItemToObjectCS(parent, "allowed_slices_count", ac);
return 0;
}
static int add_am_policy_features(cJSON *parent, const amf_ue_t *ue)
{
uint64_t f = ue->am_policy_control_features;
cJSON *fv = cJSON_CreateNumber((double)f);
if (!fv) return -1;
cJSON_AddItemToObjectCS(parent, "am_policy_features", fv);
cJSON *feat = cJSON_CreateObject();
if (!feat) return -1;
char hex[2 + 16 + 1];
(void)snprintf(hex, sizeof hex, "0x%016" PRIx64, f);
cJSON *hx = cJSON_CreateString(hex);
if (!hx) { cJSON_Delete(feat); return -1; }
cJSON_AddItemToObjectCS(feat, "hex", hx);
cJSON *bits = cJSON_CreateArray();
cJSON *labels = cJSON_CreateArray();
if (!bits || !labels) { if (bits) cJSON_Delete(bits); if (labels) cJSON_Delete(labels); cJSON_Delete(feat); return -1; }
for (int i = 0; i < 64; i++) {
if ((f >> i) & 1ULL) {
cJSON *bi = cJSON_CreateNumber((double)i);
if (!bi) { cJSON_Delete(bits); cJSON_Delete(labels); cJSON_Delete(feat); return -1; }
cJSON_AddItemToArray(bits, bi);
const char *label = (i < 64 && am_policy_feature_names[i] && am_policy_feature_names[i][0])
? am_policy_feature_names[i] : NULL;
char fb[16];
if (!label) { (void)snprintf(fb, sizeof fb, "bit%d", i); label = fb; }
cJSON *ls = cJSON_CreateString(label);
if (!ls) { cJSON_Delete(bits); cJSON_Delete(labels); cJSON_Delete(feat); return -1; }
cJSON_AddItemToArray(labels, ls);
}
}
cJSON_AddItemToObjectCS(feat, "bits", bits);
cJSON_AddItemToObjectCS(feat, "labels", labels);
cJSON_AddItemToObjectCS(parent, "am_policy_features_info", feat);
return 0;
}
static cJSON *amf_ue_to_json(const amf_ue_t *ue)
{
cJSON *o = cJSON_CreateObject();
if (!o) return NULL;
if (add_basic_identity(o, ue) < 0) goto fail;
if (add_gnb(o, ue) < 0) goto fail;
if (add_location(o, ue) < 0) goto fail;
if (add_msisdn_array(o, ue) < 0) goto fail;
if (add_security(o, ue) < 0) goto fail;
if (add_ambr(o, ue) < 0) goto fail;
if (add_pdu_sessions(o, ue) < 0) goto fail;
if (add_requested_allowed_slices(o, ue) < 0) goto fail;
if (add_am_policy_features(o, ue) < 0) goto fail;
return o;
fail:
cJSON_Delete(o);
return NULL;
}
size_t amf_dump_ue_info_paged(char *buf, size_t buflen, size_t page, size_t page_size)
{
if (!buf || buflen == 0) return 0;
const bool no_paging = (page == SIZE_MAX);
if (!no_paging) {
if (page_size == 0) page_size = 100;
if (page_size > 100) page_size = 100;
} else {
page_size = SIZE_MAX;
page = 0;
}
const size_t start_index = json_pager_safe_start_index(no_paging, page, page_size);
amf_context_t *ctxt = amf_self();
cJSON *root = cJSON_CreateObject();
if (!root) { if (buflen) buf[0] = '\0'; return 0; }
cJSON *items = cJSON_CreateArray();
if (!items) { cJSON_Delete(root); if (buflen) buf[0] = '\0'; return 0; }
cJSON_AddItemToObjectCS(root, "items", items);
size_t idx = 0, emitted = 0;
bool has_next = false;
bool oom = false;
amf_ue_t *ue = NULL;
ogs_list_for_each(&ctxt->amf_ue_list, ue) {
int act = json_pager_advance(no_paging, idx, start_index, emitted, page_size, &has_next);
if (act == 1) { idx++; continue; }
if (act == 2) break;
cJSON *one = amf_ue_to_json(ue);
if (!one) { oom = true; break; }
cJSON_AddItemToArray(items, one);
emitted++;
idx++;
}
/* add trailing pager info (json_pager_finalize will free 'root') */
json_pager_add_trailing(root, no_paging, page, page_size, emitted,
has_next && !oom, "/ue-info", oom);
return json_pager_finalize(root, buf, buflen);
}
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