35 lines
1.5 KiB
Diff
35 lines
1.5 KiB
Diff
diff -up libssh-0.10.4/include/libssh/sftp.h-cap libssh-0.10.4/include/libssh/sftp.h
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--- libssh-0.10.4/include/libssh/sftp.h-cap 2023-09-19 11:28:41.304353437 +0200
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+++ libssh-0.10.4/include/libssh/sftp.h 2023-09-19 11:34:20.828666252 +0200
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@@ -550,6 +550,10 @@ LIBSSH_API int sftp_async_read(sftp_file
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/**
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* @brief Write to a file using an opened sftp file handle.
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*
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+ * The maximum size of the SFTP packet payload is 32768 bytes so the count
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+ * parameter is capped at this value. This is low-level function so it does not
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+ * try to send more than this amount of data.
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+ *
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* @param file Open sftp file handle to write to.
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*
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* @param buf Pointer to buffer to write data.
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diff -up libssh-0.10.4/src/sftp.c-cap libssh-0.10.4/src/sftp.c
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--- libssh-0.10.4/src/sftp.c-cap 2023-09-19 11:29:02.897569013 +0200
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+++ libssh-0.10.4/src/sftp.c 2023-09-19 11:30:36.827506743 +0200
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@@ -2179,6 +2179,16 @@ ssize_t sftp_write(sftp_file file, const
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id = sftp_get_new_id(file->sftp);
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+ /* limit the writes to the maximum specified in Section 3 of
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+ * https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-02
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+ *
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+ * FIXME: This value should be adjusted to the value from the
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+ * limits@openssh.com extension if supported
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+ * TODO: We should iterate over the blocks rather than writing less than
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+ * requested to provide less surprises to the calling applications.
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+ */
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+ count = count > 32768 ? 32768 : count;
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+
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rc = ssh_buffer_pack(buffer,
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"dSqdP",
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id,
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