File size: 6,531 Bytes
2166d7e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 | #include "l9_obs.h"
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "cs_sha256.h"
static uint64_t default_clock(void *ctx)
{
(void)ctx;
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * 1000000000ull + (uint64_t)ts.tv_nsec;
}
void obs_init(obs_ctx *o, sigma_clock_fn clock, void *clock_ctx)
{
memset(o, 0, sizeof *o);
o->clock = clock ? clock : default_clock;
o->clock_ctx = clock_ctx;
cs_sha256("cstack-audit-genesis-v1", 23, o->base_chain);
}
static obs_metric *lookup(obs_ctx *o, const char *name, obs_kind kind, cs_status *st)
{
*st = CS_OK;
if (!o || !name || name[0] == '\0' || strlen(name) >= OBS_NAME_MAX) { *st = CS_ERR_ARG; return NULL; }
for (size_t i = 0; i < o->nmetrics; i++)
if (strcmp(o->metrics[i].name, name) == 0) {
if (o->metrics[i].kind != kind) { *st = CS_ERR_STATE; return NULL; }
return &o->metrics[i];
}
if (o->nmetrics == OBS_MAX_METRICS) { *st = CS_ERR_NOMEM; return NULL; }
obs_metric *m = &o->metrics[o->nmetrics++];
memset(m, 0, sizeof *m);
strcpy(m->name, name);
m->kind = kind;
return m;
}
cs_status obs_counter_add(obs_ctx *o, const char *name, uint64_t delta)
{
cs_status st;
obs_metric *m = lookup(o, name, OBS_COUNTER, &st);
if (!m) return st;
if (delta > (uint64_t)INT64_MAX - (uint64_t)m->value) return CS_ERR_RANGE;
m->value += (int64_t)delta;
return CS_OK;
}
cs_status obs_gauge_set(obs_ctx *o, const char *name, int64_t value)
{
cs_status st;
obs_metric *m = lookup(o, name, OBS_GAUGE, &st);
if (!m) return st;
m->value = value;
return CS_OK;
}
cs_status obs_observe(obs_ctx *o, const char *name, int64_t value)
{
cs_status st;
obs_metric *m = lookup(o, name, OBS_SUMMARY, &st);
if (!m) return st;
if (m->count == 0 || value < m->min) m->min = value;
if (m->count == 0 || value > m->max) m->max = value;
if ((value > 0 && m->value > INT64_MAX - value) || (value < 0 && m->value < INT64_MIN - value))
return CS_ERR_RANGE;
m->value += value;
m->count++;
return CS_OK;
}
int obs_get(const obs_ctx *o, const char *name, obs_metric *out)
{
if (!o || !name) return 0;
for (size_t i = 0; i < o->nmetrics; i++)
if (strcmp(o->metrics[i].name, name) == 0) {
if (out) *out = o->metrics[i];
return 1;
}
return 0;
}
static void event_chain(const uint8_t prev[32], const obs_event *e, uint8_t out[32])
{
cs_sha256_ctx c;
cs_sha256_init(&c);
cs_sha256_update(&c, prev, 32);
cs_sha256_update_u64(&c, e->seq);
cs_sha256_update_u64(&c, e->ts_ns);
cs_sha256_update_u64(&c, (uint64_t)e->layer);
cs_sha256_update_u64(&c, (uint64_t)e->status);
cs_sha256_update(&c, e->msg, strlen(e->msg));
cs_sha256_final(&c, out);
}
cs_status obs_audit(obs_ctx *o, int layer, cs_status status, const char *msg)
{
if (!o || layer < 0 || layer > 9) return CS_ERR_ARG;
obs_event *slot = &o->ring[o->total_events % OBS_AUDIT_CAP];
const uint8_t *prev;
uint8_t prev_copy[32];
if (o->total_events == 0) prev = o->base_chain;
else {
memcpy(prev_copy, o->ring[(o->total_events - 1) % OBS_AUDIT_CAP].chain, 32);
prev = prev_copy;
}
if (o->total_events >= OBS_AUDIT_CAP) /* the overwritten event's chain becomes the new base */
memcpy(o->base_chain, slot->chain, 32);
obs_event e;
memset(&e, 0, sizeof e);
e.seq = o->total_events + 1;
e.ts_ns = o->clock(o->clock_ctx);
e.layer = layer;
e.status = status;
snprintf(e.msg, sizeof e.msg, "%s", msg ? msg : "");
event_chain(prev, &e, e.chain);
*slot = e;
o->total_events++;
return CS_OK;
}
uint64_t obs_audit_total(const obs_ctx *o) { return o ? o->total_events : 0; }
static size_t retained(const obs_ctx *o)
{
return o->total_events < OBS_AUDIT_CAP ? (size_t)o->total_events : OBS_AUDIT_CAP;
}
const obs_event *obs_audit_at(const obs_ctx *o, size_t i)
{
if (!o || i >= retained(o)) return NULL;
uint64_t first = o->total_events - retained(o);
return &o->ring[(first + i) % OBS_AUDIT_CAP];
}
cs_status obs_audit_verify(const obs_ctx *o)
{
if (!o) return CS_ERR_ARG;
uint8_t prev[32];
memcpy(prev, o->base_chain, 32);
uint64_t first_seq = o->total_events - retained(o) + 1;
for (size_t i = 0; i < retained(o); i++) {
const obs_event *e = obs_audit_at(o, i);
uint8_t want[32];
if (e->seq != first_seq + i) return CS_ERR_TAMPER;
event_chain(prev, e, want);
if (!cs_ct_equal(want, e->chain, 32)) return CS_ERR_TAMPER;
memcpy(prev, e->chain, 32);
}
return CS_OK;
}
/* append helper for snprintf-style output */
typedef struct sink { char *buf; size_t cap, total; } sink;
static void emit(sink *s, const char *fmt_line, size_t n)
{
if (s->cap > 0 && s->total < s->cap) {
size_t room = s->cap - s->total - 1;
size_t w = n < room ? n : room;
memcpy(s->buf + s->total, fmt_line, w);
s->buf[s->total + w] = '\0';
}
s->total += n;
}
size_t obs_export_metrics(const obs_ctx *o, char *buf, size_t cap)
{
sink s = {buf, cap, 0};
char line[160];
if (cap > 0) buf[0] = '\0';
for (size_t i = 0; i < o->nmetrics; i++) {
const obs_metric *m = &o->metrics[i];
int n;
switch (m->kind) {
case OBS_SUMMARY:
n = snprintf(line, sizeof line, "%s_count %llu\n%s_sum %lld\n%s_min %lld\n%s_max %lld\n",
m->name, (unsigned long long)m->count, m->name, (long long)m->value,
m->name, (long long)m->min, m->name, (long long)m->max);
break;
default:
n = snprintf(line, sizeof line, "%s %lld\n", m->name, (long long)m->value);
}
emit(&s, line, (size_t)n);
}
return s.total;
}
size_t obs_export_audit(const obs_ctx *o, char *buf, size_t cap)
{
sink s = {buf, cap, 0};
char line[256], hex[17];
if (cap > 0) buf[0] = '\0';
for (size_t i = 0; i < retained(o); i++) {
const obs_event *e = obs_audit_at(o, i);
cs_hex(e->chain, 8, hex);
int n = snprintf(line, sizeof line, "%llu %llu L%d %s %s chain=%s\n",
(unsigned long long)e->seq, (unsigned long long)e->ts_ns, e->layer,
cs_status_str(e->status), e->msg, hex);
emit(&s, line, (size_t)n);
}
return s.total;
}
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