Add read-only pkg diagnostics: manifest dump, integrity verify, embedded ids

Three read-only endpoints (no install, no writes) to inspect a downloaded
package on-device:

- GET /api/manifest/<title_id> — re-fetch the patch manifest (PatchDL bypasses
  the DNS block) and dump each piece's offset/size/SHA-256.
- GET /api/pkgverify/<title_id> — SHA-256 every piece of the assembled .pkg
  against the manifest hashes, on-device (SSD, no multi-GB transfer), and report
  per-piece pass/fail. Proves whether the file is byte-correct.
- GET /api/pkgmeta/<title_id> — read the pkg's embedded content id + title id
  (GetContentIdFromPkg) vs the target ids, to expose cross-region linkage.

Supporting code: patchdl_sha256_fd_region() (pread + OpenSSL EVP) in the net
layer, and bind sceAppInstUtilGetContentIdFromPkg in the install backend.

Used to diagnose the Dead Island 2 install: the 61.6 GB package verifies
byte-perfect (17/17 pieces) and its content id matches the target, so the
0x80B2116F install rejection is a Sony install-method limitation, not the data.

src/patchdl_install.c

@@ -57,11 +57,13 @@ typedef int (*ai_install_pkg_fn)(const char *path, ai_pkg_info_t *info);
 typedef int (*ai_install_by_pkg_fn)(ai_meta_info_t *meta, ai_pkg_info_t *info,
                                     ai_playgo_info_t *playgo);
 typedef int (*ai_title_from_pkg_fn)(const char *path, char *title_id, int *is_app);
+typedef int (*ai_content_from_pkg_fn)(const char *path, char *content_id, int *is_app);
 
-static ai_init_fn           ai_initialize;
-static ai_install_pkg_fn    ai_install_pkg;
-static ai_install_by_pkg_fn ai_install_by_package;
-static ai_title_from_pkg_fn ai_title_from_pkg;
+static ai_init_fn             ai_initialize;
+static ai_install_pkg_fn      ai_install_pkg;
+static ai_install_by_pkg_fn   ai_install_by_package;
+static ai_title_from_pkg_fn   ai_title_from_pkg;
+static ai_content_from_pkg_fn ai_content_from_pkg;
 
 /* Resolve + initialize the AppInstUtil backend WITHOUT linking the sce libs
    (that makes the ELF unloadable by the elfldr) and WITHOUT raw
@@ -205,6 +207,8 @@ backend_init_thread(void *arg) {
                                                          "sceAppInstUtilInstallByPackage");
     ai_title_from_pkg     = (ai_title_from_pkg_fn)dynsym("libSceAppInstUtil.sprx",
                                                          "sceAppInstUtilGetTitleIdFromPkg");
+    ai_content_from_pkg   = (ai_content_from_pkg_fn)dynsym("libSceAppInstUtil.sprx",
+                                                          "sceAppInstUtilGetContentIdFromPkg");
 
     /* Read-only feasibility probe — module is loaded, safe context. */
     fill_probe();
@@ -284,6 +288,56 @@ patchdl_install_api_probe(char *out, size_t out_sz) {
     return -1;
 }
 
+/* Read-only: report the .pkg's embedded content id + title id (and whether it
+   is a full app vs a patch). No install, no side effects. 0 if anything read. */
+int
+patchdl_install_pkg_meta(const char *local_path, char *content_id, size_t cid_sz,
+                         char *title_id, size_t tid_sz, int *is_app,
+                         char *msg, size_t msg_sz) {
+    char        sdk_path[1024];
+    char        cid[64] = {0}, tid[48] = {0};
+    int         app_c = 0, app_t = 0, ok = 0;
+    struct stat st;
+
+    if (content_id && cid_sz) content_id[0] = '\0';
+    if (title_id && tid_sz)   title_id[0]   = '\0';
+    if (is_app) *is_app = 0;
+
+    if (!local_path || !local_path[0] || stat(local_path, &st) != 0) {
+        snprintf(msg, msg_sz, "package not on disk");
+        return -1;
+    }
+    backend_start();
+    if (g_stage != 5) {
+        snprintf(msg, msg_sz, "install backend not ready: %s", stage_str(g_stage));
+        return -1;
+    }
+    if (!strncmp(local_path, "/data/", 6))
+        snprintf(sdk_path, sizeof sdk_path, "/user%s", local_path);
+    else
+        snprintf(sdk_path, sizeof sdk_path, "%s", local_path);
+
+    if (ai_content_from_pkg &&
+        ai_content_from_pkg(sdk_path, cid, &app_c) == 0 && cid[0]) {
+        if (content_id && cid_sz) {
+            strncpy(content_id, cid, cid_sz - 1);
+            content_id[cid_sz - 1] = '\0';
+        }
+        if (is_app) *is_app = app_c;
+        ok = 1;
+    }
+    if (ai_title_from_pkg &&
+        ai_title_from_pkg(sdk_path, tid, &app_t) == 0 && tid[0]) {
+        if (title_id && tid_sz) {
+            strncpy(title_id, tid, tid_sz - 1);
+            title_id[tid_sz - 1] = '\0';
+        }
+        ok = 1;
+    }
+    snprintf(msg, msg_sz, ok ? "ok" : "could not read pkg metadata");
+    return ok ? 0 : -1;
+}
+
 int
 patchdl_install_local_pkg(const char *local_path, const char *expected_title_id,
                           const char *storage_title_id,

src/patchdl_install.h

@@ -31,3 +31,9 @@ int patchdl_install_backend_check(char *msg, size_t msg_sz);
    AppInstUtil/Bgft patch-install symbols and report which exist on this
    firmware. Writes a JSON object into `out`. No install, no side effects. */
 int patchdl_install_api_probe(char *out, size_t out_sz);
+
+/* Read-only: report the .pkg's embedded content id + title id (and whether it
+   is a full app vs a patch, via *is_app). No install. 0 if anything was read. */
+int patchdl_install_pkg_meta(const char *local_path, char *content_id, size_t cid_sz,
+                             char *title_id, size_t tid_sz, int *is_app,
+                             char *msg, size_t msg_sz);

src/patchdl_net.c

@@ -807,6 +807,41 @@ patchdl_http_download_piece(const char *url, int fd,
     return 0;
 }
 
+/* Read-only: SHA-256 a [offset, offset+size) region of fd into out_hex (>=65
+   bytes). Uses pread so it doesn't disturb the fd offset. 0 on success. */
+int
+patchdl_sha256_fd_region(int fd, long long offset, long long size, char *out_hex) {
+    EVP_MD_CTX   *md;
+    unsigned char *buf;
+    long long      pos = offset, remaining = size;
+    const size_t   CHUNK = 1u << 20;
+
+    out_hex[0] = '\0';
+    if (fd < 0 || size < 0) return -1;
+    md = EVP_MD_CTX_new();
+    if (!md) return -1;
+    buf = malloc(CHUNK);
+    if (!buf) { EVP_MD_CTX_free(md); return -1; }
+    EVP_DigestInit_ex(md, EVP_sha256(), NULL);
+    while (remaining > 0) {
+        size_t  want = remaining > (long long)CHUNK ? CHUNK : (size_t)remaining;
+        ssize_t got  = pread(fd, buf, want, (off_t)pos);
+        if (got <= 0) { free(buf); EVP_MD_CTX_free(md); return -1; }
+        EVP_DigestUpdate(md, buf, (size_t)got);
+        pos += got; remaining -= got;
+    }
+    {
+        unsigned char dig[EVP_MAX_MD_SIZE];
+        unsigned int  dl = 0, i;
+        EVP_DigestFinal_ex(md, dig, &dl);
+        for (i = 0; i < dl; i++) sprintf(out_hex + 2 * i, "%02x", dig[i]);
+        out_hex[2 * dl] = '\0';
+    }
+    free(buf);
+    EVP_MD_CTX_free(md);
+    return 0;
+}
+
 void
 patchdl_manifest_free(patchdl_manifest_t *m) {
     if (!m || !m->pieces) return;

src/patchdl_net.h

@@ -57,6 +57,11 @@ int patchdl_http_download_piece(const char *url, int fd,
                                 const char *expected_sha256_or_null,
                                 patchdl_piece_ctx_t *ctx);
 
+/* Read-only: SHA-256 a [offset, offset+size) region of fd into out_hex
+   (caller provides >= 65 bytes). Returns 0 on success. */
+int patchdl_sha256_fd_region(int fd, long long offset, long long size,
+                             char *out_hex);
+
 /* Progress callback. Return non-zero to ABORT the in-flight download (used to
    cancel large patch downloads); return 0 to continue. */
 typedef int (*patchdl_download_progress_cb)(void *ctx,

src/patchdl_websrv.c

@@ -1807,6 +1807,113 @@ on_request(void *cls, struct MHD_Connection *conn, const char *url,
     if (!strcmp(url, "/api/pkgdiag"))
         return queue_json(conn, MHD_HTTP_OK, g_pkg_diag_json);
 
+    /* Read-only diagnostic: re-fetch the patch manifest for a title (PatchDL can
+       bypass the DNS block) and dump each piece's offset/size/SHA-256 so the
+       assembled .pkg can be verified against Sony's own hashes. No install. */
+    if (!strncmp(url, "/api/manifest/", 14)) {
+        const char      *tid = url + 14;
+        char             purl[768] = {0}, pti[32], psti[32], cid[64], nm[128], ver[16];
+        patchdl_source_t src;
+        int              en;
+        patchdl_manifest_t mf;
+        jbuf_t           j = {0};
+
+        if (!get_title_action_info(tid, &src, purl, sizeof purl, pti, sizeof pti,
+                                   psti, sizeof psti, cid, sizeof cid,
+                                   nm, sizeof nm, ver, sizeof ver, &en) || !purl[0])
+            return queue_json(conn, MHD_HTTP_NOT_FOUND,
+                              "{\"error\":\"no patch_url for title\"}");
+        memset(&mf, 0, sizeof mf);
+        if (patchdl_fetch_manifest(purl, &mf) != 0)
+            return queue_json(conn, MHD_HTTP_BAD_GATEWAY,
+                              "{\"error\":\"manifest fetch failed\"}");
+        jbuf_appendf(&j, "{\"count\":%d,\"total\":%lld,\"pieces\":[",
+                     mf.count, mf.total);
+        for (int i = 0; i < mf.count; i++) {
+            if (i) jbuf_append(&j, ",");
+            jbuf_appendf(&j, "{\"o\":%lld,\"s\":%lld,\"h\":\"%s\"}",
+                         mf.pieces[i].offset, mf.pieces[i].size, mf.pieces[i].hash);
+        }
+        jbuf_append(&j, "]}");
+        patchdl_manifest_free(&mf);
+        return queue_json_owned(conn, MHD_HTTP_OK,
+                                j.buf ? j.buf : strdup("{}"));
+    }
+
+    /* Read-only: SHA-256 every piece of the on-disk .pkg and compare to Sony's
+       manifest hashes — proves whether the assembled file is byte-correct. No
+       install. Hashing runs on-device (SSD), so no multi-GB transfer. */
+    if (!strncmp(url, "/api/pkgverify/", 15)) {
+        const char        *tid = url + 15;
+        char               purl[768] = {0}, pti[32], psti[32], cid[64], nm[128], ver[16];
+        char               dest[320];
+        patchdl_source_t   src;
+        int                en, fd, okc = 0, badc = 0, first_bad = -1;
+        patchdl_manifest_t mf;
+        jbuf_t             j = {0};
+
+        if (!get_title_action_info(tid, &src, purl, sizeof purl, pti, sizeof pti,
+                                   psti, sizeof psti, cid, sizeof cid,
+                                   nm, sizeof nm, ver, sizeof ver, &en) || !purl[0])
+            return queue_json(conn, MHD_HTTP_NOT_FOUND,
+                              "{\"error\":\"no patch_url for title\"}");
+        title_pkg_path(tid, purl, dest, sizeof dest);
+        fd = open(dest, O_RDONLY);
+        if (fd < 0)
+            return queue_json(conn, MHD_HTTP_NOT_FOUND,
+                              "{\"error\":\"pkg not on disk\"}");
+        memset(&mf, 0, sizeof mf);
+        if (patchdl_fetch_manifest(purl, &mf) != 0) {
+            close(fd);
+            return queue_json(conn, MHD_HTTP_BAD_GATEWAY,
+                              "{\"error\":\"manifest fetch failed\"}");
+        }
+        jbuf_appendf(&j, "{\"count\":%d,\"pieces\":[", mf.count);
+        for (int i = 0; i < mf.count; i++) {
+            char got[80] = {0};
+            int  ok = 0;
+            if (mf.pieces[i].hash[0] &&
+                patchdl_sha256_fd_region(fd, mf.pieces[i].offset,
+                                         mf.pieces[i].size, got) == 0)
+                ok = (strcasecmp(got, mf.pieces[i].hash) == 0);
+            if (ok) okc++; else { badc++; if (first_bad < 0) first_bad = i; }
+            if (i) jbuf_append(&j, ",");
+            jbuf_appendf(&j, "{\"i\":%d,\"o\":%lld,\"s\":%lld,\"ok\":%s}",
+                         i, mf.pieces[i].offset, mf.pieces[i].size,
+                         ok ? "true" : "false");
+        }
+        jbuf_appendf(&j, "],\"ok\":%d,\"bad\":%d,\"first_bad\":%d,\"all_ok\":%s}",
+                     okc, badc, first_bad, (badc == 0 ? "true" : "false"));
+        patchdl_manifest_free(&mf);
+        close(fd);
+        return queue_json_owned(conn, MHD_HTTP_OK, j.buf ? j.buf : strdup("{}"));
+    }
+
+    /* Read-only: report the .pkg's embedded content id / title id vs the target
+       (installed app) ids, to expose the cross-region linkage. No install. */
+    if (!strncmp(url, "/api/pkgmeta/", 13)) {
+        const char      *tid = url + 13;
+        char             purl[768] = {0}, pti[32], psti[32], cid[64], nm[128], ver[16];
+        char             dest[320], ecid[64] = {0}, etid[48] = {0}, msg[128], resp[900];
+        patchdl_source_t src;
+        int              en, is_app = 0, rc;
+
+        if (!get_title_action_info(tid, &src, purl, sizeof purl, pti, sizeof pti,
+                                   psti, sizeof psti, cid, sizeof cid,
+                                   nm, sizeof nm, ver, sizeof ver, &en) || !purl[0])
+            return queue_json(conn, MHD_HTTP_NOT_FOUND, "{\"error\":\"unknown title\"}");
+        title_pkg_path(tid, purl, dest, sizeof dest);
+        rc = patchdl_install_pkg_meta(dest, ecid, sizeof ecid, etid, sizeof etid,
+                                      &is_app, msg, sizeof msg);
+        snprintf(resp, sizeof resp,
+                 "{\"ok\":%s,\"pkg_content_id\":\"%s\",\"pkg_title_id\":\"%s\","
+                 "\"is_app\":%s,\"target_content_id\":\"%s\",\"target_title_id\":\"%s\","
+                 "\"storage_title_id\":\"%s\",\"msg\":\"%s\"}",
+                 rc == 0 ? "true" : "false", ecid, etid, is_app ? "true" : "false",
+                 cid, tid, psti, msg);
+        return queue_json_owned(conn, MHD_HTTP_OK, strdup(resp));
+    }
+
     if (!strcmp(url, "/api/netcheck")) {
         char diag[1024] = "{\"error\":\"no title with version_file_uri\"}";
         pthread_mutex_lock(&g_mutex);