chantra / rpms / rpm

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From a4755a5ed793ca439bb23b804ba7a8ab080ff110 Mon Sep 17 00:00:00 2001
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From: chantra <chantr4@gmail.com>
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Date: Fri, 28 Jan 2022 19:19:45 -0800
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Subject: [PATCH 07/30] [rpm2extents] write RC and output to transcodedfile
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 metadata
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create a new rpmcliVerifySignaturesFD function which takes a custom callback
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that allows collecting a textual output of the validation, similar to what
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rpmsign command would give.
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---
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 lib/rpmchecksig.c | 67 +++++++++++++++++++++++++++++++++++--------
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 lib/rpmcli.h      |  5 ++--
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 rpm2extents.c     | 73 +++++++++++++++++++++++++++++++----------------
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 3 files changed, 106 insertions(+), 39 deletions(-)
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diff --git a/lib/rpmchecksig.c b/lib/rpmchecksig.c
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index 1a6b95323..fcdbb424f 100644
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--- a/lib/rpmchecksig.c
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+++ b/lib/rpmchecksig.c
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@@ -260,6 +260,29 @@ exit:
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     return rc;
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 }
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+static int rpmpkgVerifySigsFD(rpmKeyring keyring, int vfylevel, rpmVSFlags flags,
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+			   FD_t fd, rpmsinfoCb cb, void *cbdata)
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+{
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+    char *msg = NULL;
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+    int rc;
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+    struct rpmvs_s *vs = rpmvsCreate(vfylevel, flags, keyring);
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+
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+    rc = rpmpkgRead(vs, fd, NULL, NULL, &msg;;
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+
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+    if (rc)
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+	goto exit;
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+
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+    rc = rpmvsVerify(vs, RPMSIG_VERIFIABLE_TYPE, cb, cbdata);
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+
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+exit:
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+    if (rc && msg)
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+	rpmlog(RPMLOG_ERR, "%s\n", msg);
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+    rpmvsFree(vs);
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+    free(msg);
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+    return rc;
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+}
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+
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+
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 /* Wrapper around rpmkVerifySigs to preserve API */
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 int rpmVerifySignatures(QVA_t qva, rpmts ts, FD_t fd, const char * fn)
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 {
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@@ -305,12 +328,38 @@ int rpmcliVerifySignatures(rpmts ts, ARGV_const_t argv)
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     return res;
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 }
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-int rpmcliVerifySignaturesFD(rpmts ts, FD_t fdi)
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+struct vfydatafd_s {
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+    size_t len;
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+    char msg[BUFSIZ];
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+};
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+
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+
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+static int vfyFDCb(struct rpmsinfo_s *sinfo, void *cbdata)
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 {
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-    int res = 0;
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+    struct vfydatafd_s *vd = cbdata;
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+    char *vmsg, *msg;
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+    size_t n;
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+    size_t remainder = BUFSIZ - vd->len;
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+
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+    vmsg = rpmsinfoMsg(sinfo);
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+    rasprintf(&msg, "    %s\n", vmsg);
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+    n = rstrlcpy(vd->msg + vd->len, msg, remainder);
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+    free(vmsg);
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+    free(msg);
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+    if(n <= remainder){
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+	vd->len += n;
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+    }
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+    return 1;
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+}
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+
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+
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+int rpmcliVerifySignaturesFD(rpmts ts, FD_t fdi, char **msg)
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+{
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+    rpmRC rc = RPMRC_FAIL;
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     rpmKeyring keyring = rpmtsGetKeyring(ts, 1);
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     rpmVSFlags vsflags = rpmtsVfyFlags(ts);
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     int vfylevel = rpmtsVfyLevel(ts);
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+    struct vfydatafd_s vd = {.len = 0};
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     vsflags |= rpmcliVSFlags;
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     if (rpmcliVfyLevelMask) {
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@@ -318,19 +367,13 @@ int rpmcliVerifySignaturesFD(rpmts ts, FD_t fdi)
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 	rpmtsSetVfyLevel(ts, vfylevel);
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     }
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-    FD_t fd = fdDup(Fileno(fdi));
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-    if (fd == NULL || Ferror(fd)) {
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-	rpmlog(RPMLOG_ERR, _("fdDup failed: %s\n"), Fstrerror(fd));
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-	res++;
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-    } else if (rpmpkgVerifySigs(keyring, vfylevel, vsflags, fd, "stdin")) {
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-	res++;
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+    if (!rpmpkgVerifySigsFD(keyring, vfylevel, vsflags, fdi, vfyFDCb, &vd)) {
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+	rc = RPMRC_OK;
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     }
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-
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-    lseek(Fileno(fd), SEEK_SET, 0);
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-    Fclose(fd);
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+    *msg = strdup(vd.msg);
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     rpmsqPoll();
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     rpmKeyringFree(keyring);
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-    return res;
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+    return rc;
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 }
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diff --git a/lib/rpmcli.h b/lib/rpmcli.h
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index 52443e459..7ff48b37a 100644
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--- a/lib/rpmcli.h
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+++ b/lib/rpmcli.h
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@@ -413,12 +413,13 @@ int rpmcliVerifySignatures(rpmts ts, ARGV_const_t argv);
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 /** \ingroup rpmcli
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- * Verify package signatures
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+ * Verify package signatures.
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  * @param ts		transaction set
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  * @param fd		a file descriptor to verify
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+ * @param msg		a string containing textual information about the verification, similar to rpmcliVerifySignatures output.
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  * @return		0 on success
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  */
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-int rpmcliVerifySignaturesFD(rpmts ts, FD_t fd);
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+int rpmcliVerifySignaturesFD(rpmts ts, FD_t fd, char **msg);
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 #ifdef __cplusplus
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 }
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diff --git a/rpm2extents.c b/rpm2extents.c
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index d8e582676..065a00306 100644
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--- a/rpm2extents.c
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+++ b/rpm2extents.c
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@@ -133,16 +133,38 @@ exit:
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     return rc;
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 }
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-static rpmRC validator(FD_t fdi){
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+static rpmRC validator(FD_t fdi, FD_t fdo){
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+    int rc;
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+    char *msg = NULL;
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     rpmts ts = rpmtsCreate();
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+    size_t len;
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+
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     rpmtsSetRootDir(ts, rpmcliRootDir);
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-    /* rpmlog prints NOTICE to stdout */
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-    // rpmlogSetFile(stderr);
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-    if(rpmcliVerifySignaturesFD(ts, fdi)){
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+    rc = rpmcliVerifySignaturesFD(ts, fdi, &msg;;
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+    if(rc){
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 	fprintf(stderr, _("Error validating package\n"));
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-	return RPMRC_FAIL;
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     }
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-    return RPMRC_OK;
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+    len = sizeof(rc);
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+    if (Fwrite(&rc, len, 1, fdo) != len) {
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+	fprintf(stderr, _("Unable to write validator RC code %d\n"), rc);
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+	goto exit;
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+    }
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+    size_t validator_len = msg ? strlen(msg) : 0;
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+    len = sizeof(validator_len);
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+    if (Fwrite(&validator_len, len, 1, fdo) != len) {
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+	fprintf(stderr, _("Unable to write validator output length code %zd\n"), validator_len);
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+	goto exit;
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+    }
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+    if (Fwrite(msg, validator_len, 1, fdo) != validator_len) {
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+	fprintf(stderr, _("Unable to write validator output %s\n"), msg);
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+	goto exit;
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+    }
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+
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+exit:
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+    if(msg) {
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+	free(msg);
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+    }
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+    return rc ? RPMRC_FAIL : RPMRC_OK;
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 }
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 static rpmRC process_package(FD_t fdi, FD_t digestori, FD_t validationi)
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@@ -173,7 +195,7 @@ static rpmRC process_package(FD_t fdi, FD_t digestori, FD_t validationi)
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     rpm_mode_t mode;
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     char *rpmio_flags = NULL, *zeros;
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     const unsigned char *digest;
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-    rpm_loff_t pos, size, pad, digest_pos, validation_pos;
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+    rpm_loff_t pos, size, pad, digest_pos, validation_pos, digest_table_pos;
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     uint32_t offset_ix = 0;
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     size_t len;
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     int next = 0;
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@@ -278,6 +300,16 @@ static rpmRC process_package(FD_t fdi, FD_t digestori, FD_t validationi)
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     qsort(offsets, (size_t)offset_ix, sizeof(struct digestoffset),
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 	  digestoffsetCmp);
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+    validation_pos = pos;
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+    ssize_t validation_len = ufdCopy(validationi, fdo);
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+    if (validation_len == -1) {
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+	fprintf(stderr, _("validation output ufdCopy failed\n"));
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+	rc = RPMRC_FAIL;
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+	goto exit;
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+    }
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+
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+    digest_table_pos = validation_pos + validation_len;
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+
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     len = sizeof(offset_ix);
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     if (Fwrite(&offset_ix, len, 1, fdo) != len) {
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 	fprintf(stderr, _("Unable to write length of table\n"));
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@@ -304,7 +336,7 @@ static rpmRC process_package(FD_t fdi, FD_t digestori, FD_t validationi)
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 	}
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     }
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     digest_pos = (
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-	pos + sizeof(offset_ix) + sizeof(diglen) +
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+	digest_table_pos + sizeof(offset_ix) + sizeof(diglen) +
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 	offset_ix * (diglen + sizeof(rpm_loff_t))
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     );
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@@ -315,14 +347,6 @@ static rpmRC process_package(FD_t fdi, FD_t digestori, FD_t validationi)
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 	goto exit;
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     }
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-    validation_pos = digest_pos + digest_len;
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-    ssize_t validation_len = ufdCopy(validationi, fdo);
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-    if (validation_len == -1) {
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-	fprintf(stderr, _("validation output ufdCopy failed\n"));
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-	rc = RPMRC_FAIL;
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-	goto exit;
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-    }
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-
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     /* add more padding so the last file can be cloned. It doesn't matter that
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      * the table and validation etc are in this space. In fact, it's pretty
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      * efficient if it is.
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@@ -336,18 +360,18 @@ static rpmRC process_package(FD_t fdi, FD_t digestori, FD_t validationi)
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 	goto exit;
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     }
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     zeros = _free(zeros);
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-    if (Fwrite(&pos, len, 1, fdo) != len) {
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-	fprintf(stderr, _("Unable to write offset of digest table\n"));
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+    if (Fwrite(&validation_pos, len, 1, fdo) != len) {
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+	fprintf(stderr, _("Unable to write offset of validation output\n"));
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 	rc = RPMRC_FAIL;
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 	goto exit;
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     }
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-    if (Fwrite(&digest_pos, len, 1, fdo) != len) {
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-	fprintf(stderr, _("Unable to write offset of validation table\n"));
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+    if (Fwrite(&digest_table_pos, len, 1, fdo) != len) {
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+	fprintf(stderr, _("Unable to write offset of digest table\n"));
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 	rc = RPMRC_FAIL;
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 	goto exit;
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     }
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-    if (Fwrite(&validation_pos, len, 1, fdo) != len) {
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-	fprintf(stderr, _("Unable to write offset of validation output\n"));
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+    if (Fwrite(&digest_pos, len, 1, fdo) != len) {
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+	fprintf(stderr, _("Unable to write offset of validation table\n"));
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 	rc = RPMRC_FAIL;
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 	goto exit;
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     }
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@@ -431,11 +455,9 @@ static int teeRpm(FD_t fdi, FD_t digestori) {
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 	close(validatorpipefd[1]);
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 	close(rpmsignpipefd[0]);
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 	FD_t fdi = fdDup(validatorpipefd[0]);
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-	// redirect STDOUT to the pipe
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-	close(STDOUT_FILENO);
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 	FD_t fdo = fdDup(rpmsignpipefd[1]);
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 	close(rpmsignpipefd[1]);
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-	rc = validator(fdi);
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+	rc = validator(fdi, fdo);
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 	if(rc != RPMRC_OK) {
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 	    fprintf(stderr, _("Validator failed\n"));
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 	}
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@@ -486,6 +508,7 @@ static int teeRpm(FD_t fdi, FD_t digestori) {
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 	    close(rpmsignpipefd[0]);
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 	    close(rpmsignpipefd[1]);
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+	    rc = RPMRC_OK;
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 	    offt = ufdTee(fdi, fds, 2);
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 	    if(offt == -1){
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 		fprintf(stderr, _("Failed to tee RPM\n"));
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-- 
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2.35.1
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