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SUSE:SLE-12-SP1:GA
xen.10697
xs-17-arg-parsing.patch
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File xs-17-arg-parsing.patch of Package xen.10697
commit 197e26043e639d4ed1060d30f44f101b719a78d4 Author: Juergen Gross <jgross@suse.com> Date: Mon Dec 5 08:48:51 2016 +0100 xenstore: add helper functions for wire argument parsing The xenstore wire command argument parsing of the different commands is repeating some patterns multiple times. Add some helper functions to avoid the duplicated code. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Wei Liu <wei.liu2@citrix.com> --- a/tools/xenstore/xenstored_core.c +++ b/tools/xenstore/xenstored_core.c @@ -740,13 +740,25 @@ char *canonicalize(struct connection *co return (char *)node; } +static struct node *get_node_canonicalized(struct connection *conn, + const void *ctx, + const char *name, + char **canonical_name, + enum xs_perm_type perm) +{ + char *tmp_name; + + if (!canonical_name) + canonical_name = &tmp_name; + *canonical_name = canonicalize(conn, name); + return get_node(conn, ctx, *canonical_name, perm); +} + static int send_directory(struct connection *conn, struct buffered_data *in) { struct node *node; - const char *name = onearg(in); - name = canonicalize(conn, name); - node = get_node(conn, in, name, XS_PERM_READ); + node = get_node_canonicalized(conn, in, onearg(in), NULL, XS_PERM_READ); if (!node) return errno; @@ -759,7 +771,7 @@ static int send_directory_part(struct co struct buffered_data *in) { unsigned int off, len, maxlen, genlen; - char *name, *child, *data; + char *child, *data; struct node *node; char gen[24]; @@ -767,15 +779,13 @@ static int send_directory_part(struct co return EINVAL; /* First arg is node name. */ - name = canonicalize(conn, in->buffer); + node = get_node_canonicalized(conn, in, in->buffer, NULL, XS_PERM_READ); + if (!node) + return errno; /* Second arg is childlist offset. */ off = atoi(in->buffer + strlen(in->buffer) + 1); - node = get_node(conn, in, name, XS_PERM_READ); - if (!node) - return errno; - genlen = snprintf(gen, sizeof(gen), "%"PRIu64, node->generation) + 1; /* Offset behind list: just return a list with an empty string. */ @@ -815,10 +825,8 @@ static int send_directory_part(struct co static int do_read(struct connection *conn, struct buffered_data *in) { struct node *node; - const char *name = onearg(in); - name = canonicalize(conn, name); - node = get_node(conn, in, name, XS_PERM_READ); + node = get_node_canonicalized(conn, in, onearg(in), NULL, XS_PERM_READ); if (!node) return errno; @@ -969,8 +977,7 @@ static int do_write(struct connection *c offset = strlen(vec[0]) + 1; datalen = in->used - offset; - name = canonicalize(conn, vec[0]); - node = get_node(conn, in, name, XS_PERM_WRITE); + node = get_node_canonicalized(conn, in, vec[0], &name, XS_PERM_WRITE); if (!node) { /* No permissions, invalid input? */ if (errno != ENOENT) @@ -995,13 +1002,10 @@ static int do_write(struct connection *c static int do_mkdir(struct connection *conn, struct buffered_data *in) { struct node *node; - const char *name = onearg(in); - - if (!name) - return EINVAL; + char *name; - name = canonicalize(conn, name); - node = get_node(conn, in, name, XS_PERM_WRITE); + node = get_node_canonicalized(conn, in, onearg(in), &name, + XS_PERM_WRITE); /* If it already exists, fine. */ if (!node) { @@ -1112,10 +1116,10 @@ static int do_rm(struct connection *conn { struct node *node; int ret; - const char *name = onearg(in); + char *name; - name = canonicalize(conn, name); - node = get_node(conn, in, name, XS_PERM_WRITE); + node = get_node_canonicalized(conn, in, onearg(in), &name, + XS_PERM_WRITE); if (!node) { /* Didn't exist already? Fine, if parent exists. */ if (errno == ENOENT) { @@ -1147,12 +1151,10 @@ static int do_rm(struct connection *conn static int do_get_perms(struct connection *conn, struct buffered_data *in) { struct node *node; - const char *name = onearg(in); char *strings; unsigned int len; - name = canonicalize(conn, name); - node = get_node(conn, in, name, XS_PERM_READ); + node = get_node_canonicalized(conn, in, onearg(in), NULL, XS_PERM_READ); if (!node) return errno; @@ -1177,15 +1179,15 @@ static int do_set_perms(struct connectio return EINVAL; /* First arg is node name. */ - name = canonicalize(conn, in->buffer); - permstr = in->buffer + strlen(in->buffer) + 1; - num--; - /* We must own node to do this (tools can do this too). */ - node = get_node(conn, in, name, XS_PERM_WRITE|XS_PERM_OWNER); + node = get_node_canonicalized(conn, in, in->buffer, &name, + XS_PERM_WRITE | XS_PERM_OWNER); if (!node) return errno; + permstr = in->buffer + strlen(in->buffer) + 1; + num--; + perms = talloc_array(node, struct xs_permissions, num); if (!xs_strings_to_perms(perms, num, permstr)) return errno; --- a/tools/xenstore/xenstored_domain.c +++ b/tools/xenstore/xenstored_domain.c @@ -419,6 +419,18 @@ int do_introduce(struct connection *conn return 0; } +static struct domain *find_connected_domain(unsigned int domid) +{ + struct domain *domain; + + domain = find_domain_by_domid(domid); + if (!domain) + return ERR_PTR(-ENOENT); + if (!domain->conn) + return ERR_PTR(-EINVAL); + return domain; +} + int do_set_target(struct connection *conn, struct buffered_data *in) { char *vec[2]; @@ -433,18 +445,13 @@ int do_set_target(struct connection *con domid = atoi(vec[0]); tdomid = atoi(vec[1]); - domain = find_domain_by_domid(domid); - if (!domain) - return ENOENT; - if (!domain->conn) - return EINVAL; - - tdomain = find_domain_by_domid(tdomid); - if (!tdomain) - return ENOENT; - - if (!tdomain->conn) - return EINVAL; + domain = find_connected_domain(domid); + if (IS_ERR(domain)) + return -PTR_ERR(domain); + + tdomain = find_connected_domain(tdomid); + if (IS_ERR(tdomain)) + return -PTR_ERR(tdomain); talloc_reference(domain->conn, tdomain->conn); domain->conn->target = tdomain->conn; @@ -454,29 +461,33 @@ int do_set_target(struct connection *con return 0; } -/* domid */ -int do_release(struct connection *conn, struct buffered_data *in) +static struct domain *onearg_domain(struct connection *conn, + struct buffered_data *in) { const char *domid_str = onearg(in); - struct domain *domain; unsigned int domid; if (!domid_str) - return EINVAL; + return ERR_PTR(-EINVAL); domid = atoi(domid_str); if (!domid) - return EINVAL; + return ERR_PTR(-EINVAL); if (domain_is_unprivileged(conn)) - return EACCES; + return ERR_PTR(-EACCES); - domain = find_domain_by_domid(domid); - if (!domain) - return ENOENT; + return find_connected_domain(domid); +} - if (!domain->conn) - return EINVAL; +/* domid */ +int do_release(struct connection *conn, struct buffered_data *in) +{ + struct domain *domain; + + domain = onearg_domain(conn, in); + if (IS_ERR(domain)) + return -PTR_ERR(domain); talloc_free(domain->conn); @@ -488,25 +499,10 @@ int do_release(struct connection *conn, int do_resume(struct connection *conn, struct buffered_data *in) { struct domain *domain; - unsigned int domid; - const char *domid_str = onearg(in); - - if (!domid_str) - return EINVAL; - domid = atoi(domid_str); - if (!domid) - return EINVAL; - - if (domain_is_unprivileged(conn)) - return EACCES; - - domain = find_domain_by_domid(domid); - if (!domain) - return ENOENT; - - if (!domain->conn) - return EINVAL; + domain = onearg_domain(conn, in); + if (IS_ERR(domain)) + return -PTR_ERR(domain); domain->shutdown = 0;
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